close-application 相关问题

Django-channels 实例关闭时间过长而被杀死

谁能告诉我可能是什么问题？警告应用程序实例谁能告诉我可能是什么问题？警告应用程序实例 wait_for=> 连接关闭时间过长并被终止。我的阿斯吉 "^subscription", channels_jwt_middleware(MyConsumer.as_asgi(schema=schema)) ) application = ProtocolTypeRouter({ "http": django_asgi_app, "websocket": QueryAuthMiddleware( URLRouter([ subscription_url, ]) ), })``` my custom MyConsumer ```class MyConsumer(GraphQLWSConsumer): def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.profile_id = None async def __call__(self, scope, receive, send): user = scope.get("user", None) time_zone = await get_current_timezone(user) self.profile_id = scope.get("active_profile_id", None) self.timezone = time_zone if time_zone else settings.TIME_ZONE await super().__call__(scope, receive, send) async def connect(self): await super().connect() await change_status(True, self.profile_id) async def disconnect(self, close_code, *args, **kwargs): await super().disconnect(close_code) await change_status(False, self.profile_id)``` 解决我的问题 daphne -b 0.0.0.0 -p $SERVER_PORT --application-close-timeout 60 --proxy-headers server.asgi:application

在 Spring Boot 3 中设置活动配置文件

我有一个application.yml和application-prod.yml。我在 application.yml 中设置默认值并覆盖 application-prod.yml 中的一些值。应用程序.yml 春天：简介：活动...

write() 和字符串方法的问题（python）

create = open("lol.balbes.txt", 'w') oldfile = open("mbox-short.txt") 对于旧文件中的行：线=线.上线 = str(线) 创建.write(行) 创建.close() 我

无法使用sqlalchemy调用存储过程？

连接=engine.raw_connection() 光标 = 连接.cursor() cursor.callproc('transfer', [1, 2, 1000])# 获取结果参数结果 = 列表(cursor.fetchall()) 光标.close() 连接.com...

如何检索 Azure 资源组模板中 Application Insights 实例的检测密钥？

有没有办法在 Azure 资源组模板中检索 Application Insights 实例的 Instrumentation Key ？我已尝试此处的说明来检索 list* opera 的列表...

Android Studio 由于“内部错误”而无法打开

`内部错误。请参考https://code.google.com/p/android/issues java.lang.AssertionError：无法读取/Users/arnavgupta/Library/Application Support/Google/AndroidStudio2023.1/

TypeError：WebDriver.__init__() 获得意外的关键字参数“chrome_options”

从 selenium 导入 webdriver 从 selenium.webdriver.chrome.options 导入选项选项 = 选项() options.binary_location = "C:/Program Files (x86)/Google/Chrome/Application/chrome.exe&...

编写器出现不支持的函数截断错误：close()

RA = pd.read_excel（文件路径，标题= 0，sheet_name =“数据”） ivot_df = pd.DataFrame(RA) #插入枢轴枢轴=枢纽_df [过滤器2] .枢轴_表（指数= ['a'，'b'，'c']，值= ['总计1'，'总计...

属性 application@label 也存在于

在我的android项目中安装新库后，出现以下错误： /android/app/src/debug/AndroidManifest.xml 错误：属性应用@标签值=（同情心）来自（未知） ...

Node.js/fastify 出现错误，不支持的媒体类型：application/x-www-form-urlencoded

考虑：文件index.js fastify.get("/paynow", (请求, 回复) => { 让数据= { TXN_AMOUNT: '10', // 请求金额 ORDER_ID: 'ORDER_123455', // 任何唯一的订单 ID CUST_ID：'

Node.js/fFastify 出现错误：“不支持的媒体类型：application/x-www-form-urlencoded”

考虑：文件index.js fastify.get("/paynow", (请求, 回复) => { 让数据= { TXN_AMOUNT: '10', // 请求金额 ORDER_ID: 'ORDER_123455', // 任何唯一的订单 ID 库斯...

升级到micronaut 4后Micronaut消费和生产停止工作

在 micronaut 版本 3 上，它工作正常，在迁移到 micronaut 4 时，停止工作在注释有的端点中 @Get("/{someId}/someAction", 产生 = ["application/some.v1+json&

为什么 ILogger.LogError 有效但 ILogger.LogInformation 无效？

为什么当我注入 ILogger 并调用 Logger.LogInformation 时，我在 Application Insights 中看不到这一点，但当我调用 Logger.LogError 时却看到了？这是我的代码公共异步

在 Flask 中尝试 POST 方法时出现 415 错误

除了POST之外的所有方法都在运行。我收到错误文本：“message”：“未尝试加载 JSON 数据，因为请求内容类型不是“application/json”。” 我搜索...

浏览器将内容类型设置为 application/x-www-form-urlencoded

我为每个 @PostMapping 引用 @CrossOrigin(origin = “*”) 创建了一个注释。一开始我遇到了 415 错误，现在遇到了 503 错误以及应用程序的内容类型...

OpenTelemetry 未从 Python 代码将带有异常详细信息的消息记录到 Application Insights

我正在将 python 3.10 项目从 OpenCensus 迁移到 OpenTelemetry，因为前者今年将被淘汰。日志对于标准信息、警告、错误等正常工作

HttpMediaTypeNotSupportedException：从 AWS Lambda 运行 SpringBoot REST 应用程序时不支持内容类型“application/octet-stream”

我正在尝试在 AWS Lambda 中运行 Spring Boot 应用程序（例如，各种示例使用与 https://www.baeldung.com/spring-boot-aws-lambda 基本相同的方法 - 只需复制代码和...

FLASK PUT Curl 命令：{"message": "未尝试加载 JSON 数据，因为请求内容类型不是 'application/json'。"}

我正在关注此视频：https://www.youtube.com/watch?v=xqJXDZvtogY 一切正常，直到我为 PUT 请求编写curl 命令。我的命令提示符中显示以下错误：&...

JS Fetch 在给定“application/json”标头时返回 HTML

我有一个 API 的获取请求代码，我知道它会返回 JSON（请参阅下面的节点 - https 请求。）但是，即使我设置了“应用程序...”的标头，响应也会以 text/html 形式返回。

我需要在API网关中进行哪些设置才能接受压缩的有效负载

我有一个客户端应用程序，它将压缩数据发送到aws api网关。数据是默认压缩的。请求头如下：内容编码：deflate 内容类型：application/json ...

应用程序被杀死时，应用程序语言重置为默认值

嗨，我有一个应用程序，它加载一个网络视图，里面有一个流动的抽屉。我正在尝试更改语言环境。我有一个 localeHelper java 类和一个扩展 Application 的 AppClass 但它...

子控件中的绑定命令？

我有一个 UserControl，用作窗口对话框的“模板”。它包含一个关闭按钮和一个取消按钮。我有一个 UserControl，用作窗口对话框的“模板”。它包含一个关闭按钮和一个取消按钮。 <UserControl x:Class="TombLib.WPF.Controls.WindowControlButtons" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:TombLib.WPF.Controls" mc:Ignorable="d" xmlns:darkUI="clr-namespace:DarkUI.WPF;assembly=DarkUI.WPF" xmlns:vm="clr-namespace:TombLib.WPF.ViewModels" xmlns:sg="clr-namespace:SpacedGridControl;assembly=SpacedGridControl" d:DesignHeight="100" d:DesignWidth="300" x:Name="root"> <StackPanel VerticalAlignment="Center" HorizontalAlignment="Right" Height="Auto" Orientation="Horizontal"> <Button Name="oKButton" Margin="{x:Static darkUI:Defaults.MediumThickness}" Width="100" Height="Auto" Command="{Binding Close}" CommandParameter="{Binding Window}" Content="OK"></Button> <Button Name="cancelButton" Margin="{x:Static darkUI:Defaults.MediumThickness}" Width="100" Height="Auto" Command="{Binding Path=Cancel}" CommandParameter="{Binding Window}" Content="Cancel"></Button> </StackPanel> </UserControl> public partial class WindowControlButtons : UserControl { public static readonly DependencyProperty CancelProperty = DependencyProperty.Register( nameof(Cancel), typeof(ICommand), typeof(WindowControlButtons), new PropertyMetadata(null)); public ICommand Cancel { get { return (ICommand)GetValue(CancelProperty); } set { SetValue(CancelProperty, value); } } public static readonly DependencyProperty CloseProperty = DependencyProperty.Register( nameof(Close), typeof(ICommand), typeof(WindowControlButtons), new PropertyMetadata(null)); public ICommand Close { get { return (ICommand)GetValue(CloseProperty); } set { SetValue(CloseProperty, value); } } public static readonly DependencyProperty WindowParameter = DependencyProperty.Register( nameof(Window), typeof(object), typeof(WindowControlButtons), new PropertyMetadata(null)); public object? Window { get { return GetValue(WindowParameter); } set { SetValue(WindowParameter, value); } } public WindowControlButtons() { InitializeComponent(); } } 我想在以下窗口中使用它： <Window x:Class="TombLib.WPF.Windows.SelectIdWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:TombLib.WPF.Windows" mc:Ignorable="d" xmlns:ctrl="clr-namespace:TombLib.WPF.Controls" xmlns:vm="clr-namespace:TombLib.WPF.ViewModels" xmlns:sg="clr-namespace:SpacedGridControl;assembly=SpacedGridControl" xmlns:darkUI="clr-namespace:DarkUI.WPF;assembly=DarkUI.WPF" Title="SelectIdWindow" Height="100" Width="300" d:DataContext="{d:DesignInstance Type=vm:SelectIdViewModel }" x:Name="Self"> <sg:SpacedGrid Margin="{x:Static darkUI:Defaults.MediumThickness}">  <ctrl:WindowControlButtons DataContext="{Binding ElementName=Self}" Window="{Binding ElementName=Self, Mode=OneWay}" Close="{Binding CloseCommand,Mode=OneWay}" Cancel="{Binding CancelCommand,Mode=OneWay}" Height="Auto" Width="Auto" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" HorizontalAlignment="Right"/> </sg:SpacedGrid> </Window> public partial class SelectIdWindow : Window { public ICommand? CloseCommand { get; set; } public ICommand? CancelCommand { get; set; } public SelectIdWindow() { CloseCommand = new WindowCloseCommand(); InitializeComponent(); } } public class SelectIdViewModel { public string RequestedId { get; set; } = string.Empty; public IEnumerable<string> TakenIds { get; set;} public SelectIdViewModel(IEnumerable<string> takenIDs) { TakenIds = takenIDs; } } 但是，当我打开窗口时如下： SelectIdWindow w = new SelectIdWindow(); var takenIDs = Entities.Select(kv => kv.Key.Name); w.DataContext = new SelectIdViewModel(takenIDs); w.ShowDialog(); 我在绑定 WindowControlButtons 时收到以下错误： DataContext 显式设置为 Self，它应该代表 Window，而不是 ViewModel。我在这里做错了什么？绑定错误表明问题出在 Button.ICommand 属性上：要修复此问题，请在 WindowControlButtons 绑定中添加 ElementName=root，以便绑定到声明的依赖项属性而不是 DataContext： <UserControl x:Class="TombLib.WPF.Controls.WindowControlButtons" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:TombLib.WPF.Controls" mc:Ignorable="d" xmlns:darkUI="clr-namespace:DarkUI.WPF;assembly=DarkUI.WPF" xmlns:vm="clr-namespace:TombLib.WPF.ViewModels" xmlns:sg="clr-namespace:SpacedGridControl;assembly=SpacedGridControl" d:DesignHeight="100" d:DesignWidth="300" x:Name="root"> <StackPanel VerticalAlignment="Center" HorizontalAlignment="Right" Height="Auto" Orientation="Horizontal"> <Button Name="oKButton" ... Command="{Binding Close, ElementName=root}" CommandParameter="{Binding Window, ElementName=root}" Content="OK"/> <Button Name="cancelButton" ... Command="{Binding Path=Cancel, ElementName=root}" CommandParameter="{Binding Window, ElementName=root}" Content="Cancel"/> </StackPanel> </UserControl>

如何在 Vuetify.js 中单击附加图标时调用函数？

我需要append-icon="close"来调用@click="clearSearch()" 现在我正在使用一个专用按钮来实现它：我需要 append-icon="close" 打电话给 @click="clearSearch()" 现在我正在使用专用按钮来实现它： <v-text-field v-model="search" class="search" label="search" prepend-icon="search" append-icon="close"> </v-text-field> <v-btn @click="clearSearch()"></v-btn> 我尝试添加append-icon-cb="clearSearch()"但它不起作用，我不知道为什么我也尝试过简单地使用clearable，它会清除输入，但所有元素都保持“过滤”状态。我不知道 clearable 是如何工作的，但我的 clearSearch() 方法只是这样做： clearSearch() {this.search = ""} 并且它有效，这就是为什么我使用自定义 clear input 方法使用 @click:append="clearSearch"，:append-icon-cb 已弃用。（来源）解决了，解决方法如下：为了避免这个问题，您应该使用 : 符号绑定属性： :append-icon-cb="clearSearch" 并且不要放()，否则它将无法工作（正如@Traxo提到的）我认为如果你删除 () 应该可以工作，因为包含 () 后，你立即只需调用一次函数即可。编辑：不要忘记冒号: 所以： :append-icon-cb="clearSearch" 但这发生了变化：对于附加图标，例如 append-icon="mdi-magnify-plus-outline", 你就这样做 @click:append="zoomIn"。但是对于附加外部图标，例如 append-outer-icon="mdi-plus-circle-outline"，` 您必须添加单词“append”，即 @click:append-outer="addMore" 因此，这将适用于 Vue2 <v-text-field solo append-outer-icon="mdi-plus-circle-outline" @click:append-outer="addMore" > </v-text-field> 只需将 :append-icon-cb="() => (e1 = !e1)" 更改为 @click:append="() => (e1 = !e1)" 即可完美运行并删除警告...

脚本无法在我的引导模式中工作

希望这不是一个愚蠢的问题，但我已经没有主意了...... 所以我有这个模式： 1.scala.html 希望这不是一个愚蠢的问题，但我已经没有主意了...... 所以我有这个模式： 1.scala.html <div class="feat" id="cor" data-toggle="tooltip" data-placement="bottom" title="add conference role"><div data-toggle="modal" data-target="#conf-role-menu-modal">Conference Role</div></div> <div class="modal fade" id="conf-role-menu-modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button> <h4 class="modal-title" id="myModalLabel">Modal title</h4> </div> <div class="modal-body-conf-role-menu"> <script type="text/javascript"> $(function(){ $(".modal-body-conf-role-menu").load("@routes.Application.areaConferenceRole(id,idenv)"); }); </script> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> </div> </div> </div> </div> 使用模态主体中的脚本，我尝试加载此页面： 2.scala.html @(id:String, idenv:String) @Main("Add area") { <form action="@routes.Application.areaPostConferenceRole(id,idenv)" method="POST"> First Name: <input type="text" name="first_name" id="first" class="form-control"> Last Name : <input name="last_name" class="form-control"> <script type="text/javascript"> $( document ).ready(function() { // Handler for .ready() called. $( "#first" ).focus(function() { alert( "Handler for .focus() called." ); }); }); </script> </form> } 页面加载正常。我在我的模态中看到它...... 问题是我的页面 2.scala.html 中的脚本无法运行。我不明白为什么......如果我从我尝试在模态中加载的页面之外尝试它们，它们就会起作用...... $( document ).ready(function(){}); 永远不会在模态中到达，因为加载页面时已经触发了此事件（模态在之后加载...）尝试直接插入脚本，如下所示： <script type="text/javascript"> $( "#first" ).focus(function() { alert( "Handler for .focus() called." ); }); </script> 当引导模式弹出时，shown.bs.modal事件将被触发。这是例子。 $('#myModal').on('shown.bs.modal', function () { $('#myInput').trigger('focus') }) Full documentation. https://getbootstrap.com/docs/4.0/components/modal/ 试试这个我已经准备好这个功能了 $('#myModal').on('shown.bs.modal', function () { // Your script here }); $(document).on('shown.bs.modal', '#myModal', function () { // Your script here });

资源提供的整数在运行时出现乱码

在我的 Android 应用程序中，我创建了文件 app/src/main/res/values/integers.xml：在我的 Android 应用程序中，我创建了文件 app/src/main/res/values/integers.xml: <?xml version="1.0" encoding="utf-8"?> <resources> <integer name="server_port">8080</integer> </resources> 然后我就有了 public class MyApplication extends Application { final MyServer server = new MyServer(R.integer.server_port); } 但是，当应用程序启动时，日志语句显示该值（即 R.integer.server_port）为 2131296322。为什么数值会出现乱码？这不是整数资源应该如何实现的吗？ R.integer.server_port 给出整数的资源 ID，而不是整数本身。为了获得实际的整数，你必须做getResources().getInteger(R.integer.server_port)。但是，这需要对原始代码进行一些修改，因为在实例化 MyApplication 时尚未设置资源。相反，你可以这样做 public class MyApplication extends Application { MyServer server; @Override public void onCreate() { super.onCreate(); server = new MyServer(getResources().getInteger(R.integer.server_port)); } }

MathML (firefox) 中不显示括号

MathML代码是这样的：分钟 MathML代码是这样的： <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>min</mi><mfenced open="(" close=")"><mrow><mn>9</mn><mo>,</mo><mn>6</mn></mrow></mfenced><mo>=</mo></mrow></math> 遗憾的是，它显示时没有括号。（参见https://prnt.sc/FBuGkh1NtM-7）我在这里做错了什么？谢谢！ <math display="block"> <mrow> <mo fence="true" form="prefix">(</mo> <mn>9</mn> <mo fence="true" form="postfix">)</mo> </mrow> </math> 这有效。但不知道为什么之前的 MathML 不起作用。 “mfenced”似乎已被贬值并被“mo”取代。 “mrow”可用于组子表达式并为方程提供层次结构： <mrow> <mi>f</mi> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow>

为什么每次我尝试将应用程序从 Anypoint Studio 部署到 CloudHub 时，我的 pom.xml 文件都会更新？

我的 pom.xml 文件中有以下部分用于我正在执行的虚拟项目： org.mule.tools.maven mule-maven-插件我正在做的一个虚拟项目的 pom.xml 文件中有以下部分： <plugin> <groupId>org.mule.tools.maven</groupId> <artifactId>mule-maven-plugin</artifactId> <version>${mule.maven.plugin.version}</version> <extensions>true</extensions> <configuration> <classifier>mule-application</classifier> </configuration> </plugin> 每当我尝试直接从 Studio 将应用程序部署到 CloudHub 时，上面的部分就会更改为以下部分： <plugin> <groupId>org.mule.tools.maven</groupId> <artifactId>mule-maven-plugin</artifactId> <version>${mule.maven.plugin.version}</version> <extensions>true</extensions> <configuration> <classifier>---- select project type ----</classifier> </configuration> </plugin> 然后部署失败并出现以下错误： Publication status: error [INFO] ------------------------------------------------------------ [INFO] Steps: [INFO] - Description: Publishing asset [INFO] - Status: error [INFO] - Errors: [The asset is invalid, Error while trying to set type: app. Expected type is: rest-api.] [INFO] ......................................... [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 02:33 min [INFO] Finished at: 2024-01-08T14:11:31+05:30 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.mule.tools.maven:exchange-mule-maven-plugin:0.0.17:exchange-deploy (default-exchange-deploy) on project super-biodata-sapi: Exchange publication failed: Publication ended with errors: [The asset is invalid, Error while trying to set type: app. Expected type is: rest-api.] -> [Help 1] 这可能是什么原因？以下是一些细节： Anypoint Studio版本：7.16.0 Maven版本：3.8.8 Mule 运行时版本：4.4.0 Mule Maven 插件版本：3.8.0/4.0.0（两者都尝试过） Java版本：OpenJDK 11.0.9 我以前使用过 Anypoint Studio 7.15，在那里完全相同的项目没有任何问题。但更新后，我遇到了很多问题。我还尝试使用“rest-api”而不是“mule-application”。然后，首先在部署开始时，“rest-api”更改为“mule-application”，然后再次更改为“----选择项目类型----”，最后失败。我怀疑存在混乱。您提到您正在尝试将 Mule 4 应用程序部署到 CloudHub，但对资产的引用和错误消息与将资产发布到 Any point Exchange 相关。 CloudHub是一个部署和执行Mule应用程序的云平台。 Anypoint Exchange 是资产存储库，包括 REST API 的定义，但不包括 Mule 4 应用程序，也不用于执行任何操作。有关有效资产的详细信息，请参阅文档。由于 mule-application 不是发布到 Exchange 的有效资产类型（对于 Mule 4），那么 Studio 似乎试图让您更改为有效的资产类型。如果您尝试部署到 CloudHub，请参阅文档了解不同的方法。

活动深层链接 - IllegalArgumentException：缺少必需的参数并且没有 android:defaultValue

在我的应用程序中，我有以下结构：在我的应用程序中，我具有以下结构：  <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"> <application> <activity android:name=".DeepLinkActivity" android:exported="true" android:launchMode="singleInstancePerTask"> <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.BROWSABLE" /> <data android:host="myhost" android:path="/mypath" android:scheme="myscheme" /> </intent-filter> </activity> </application> </manifest>  <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <androidx.fragment.app.FragmentContainerView android:id="@+id/navHostFragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" app:defaultNavHost="true" tools:navGraph="@navigation/my_nav_graph" /> </FrameLayout> // DeepLinkActivity.kt class DeepLinkActivity : AppCompatActivity() { private lateinit var binding: ActivityDeepLinkBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityDeepLinkBinding.inflate(layoutInflater) setContentView(binding.root) setUpNavigationGraph() } private fun setUpNavigationGraph() { val navHostFragment = supportFragmentManager .findFragmentById(binding.navHostFragment.id) as NavHostFragment val navController = navHostFragment.navController val navGraph = navController.navInflater .inflate(R.navigation.my_nav_graph) .apply { this.setStartDestination(R.id.notTheStartDestinationFragment) } val startDestinationArgs = bundleOf( "someRequiredArgumentHere" to false ) navController.setGraph(navGraph, startDestinationArgs) } } 当我通过 ADB (adb shell am start -d myscheme://myhost/mypath) 通过深度链接打开该活动时，该活动正常启动。但是当我通过 Chrome 应用程序启动它时，应用程序崩溃了：原因：java.lang.IllegalArgumentException：缺少必需参数“someRequiredArgumentHere”并且没有 android:defaultValue 观察：我正在使用 Safe Args 插件。我做错了什么以及为什么行为不同？我刚刚发现为什么在通过浏览器导航时会忽略 startDestinationArgs。如果我们检查NavController#setGraph(NavGraph, Bundle?)的内部代码，如果没有发生深层链接，NavController#onGraphCreated(Bundle?)只会使用startDestinationArgs。作为一种解决方法，在设置导航图之前，我只需清除活动的意图（但这可能不是解决该问题的最佳方法）

标识符“ChatFeed”已被声明

从 'react-chat-engine' 导入 { ChatEngine, ChatFeed }; 从 './components/chatFeed' 导入 ChatFeed；导入'./App.css'; 常量应用程序 = () => { 返回（ import { ChatEngine, ChatFeed } from 'react-chat-engine'; import ChatFeed from './components/chatFeed'; import './App.css'; const App = () => { return( <ChatEngine height="100vh" projectID="" userName="" userSecret="" renderChatFeed={(chatAppProps) => <ChatFeed {...chatAppProps} />} /> ); } export default App; 服务器运行时显示错误 SyntaxError: D:\PROJECTS\APPLICATION\chat_app\src\App.js: Identifier 'ChatFeed' has already been declared. (3:7) 1 | import { ChatEngine, ChatFeed } from 'react-chat-engine'; 2 | > 3 | import ChatFeed from './components/chatFeed'; | ^ 好吧，错误消息说明了一切，您声明了 ChatFeed 两次。您可以通过以下方式修复它：重命名您的组件，例如 import ChatFeedComponent from './components/chatFeed'; 将命名导入从 react-chat-engine 重命名为 import { ChatEngine, ChatFeed as ChatFeedComp } from 'react-chat-engine'; 当然，随意使用你喜欢的任何名称错误消息显示您导入 ChatFeed 两次。您可以修复它，从第一行删除 chatFeed 用这个从“react-chat-engine”导入{ChatEngine}；从 './components/ChatFeed' 导入 ChatFeed；

MatToolbar：尝试组合不同的工具栏模式

出现以下错误： MatToolbar：尝试组合不同的工具栏模式。显式指定多个元素或仅将内容放置在中出现以下错误： MatToolbar：尝试组合不同的工具栏模式。要么显式指定多个 <mat-toolbar-row> 元素，要么仅将内容放置在单行的 <mat-toolbar> 中。我的代码已经在 mat-toolbar 中应用了 mat-toolbar-row。然而，该错误仍然存在。 html文件的代码片段如下： <div class="wallpaper"> <mat-toolbar color="primary"> <mat-toolbar-row> <span>Welcome, User</span> <span class="example-fill-remaining-space"></span> <span class="align-center"></span> <span class="example-spacer"></span> <button mat-button>Create Incident </button> <a [routerLink]="['/closed']"><button mat-button style="color: white">Closed Incident</button></a> <span class="example-spacer"></span> <a [routerLink]="['/login']"><button mat-button>Logout</button></a> <img src="../../assets/hsbc_logo3.png" class="logo-hsbc"/> </mat-toolbar-row> <h1>INCIDENT MANAGEMENT SYSTEM</h1> </mat-toolbar> <h1>Welcome to Incident Management System</h1> <mat-card style="background: transparent">  <mat-card-title>Incident Details</mat-card-title> <mat-card-content> <form> <table > <tr> <td> <mat-form-field class="demo-full-width"> <mat-label >Description</mat-label> <textarea [(ngModel)]="incident.description" name="description" cdkTextareaAutosize cdkAutosizeMinRows="1" cdkAutosizeMaxRows="5" matInput></textarea> </mat-form-field> </td> <td> <h4>{{message}}</h4> </td> </tr> <tr> <td> <mat-form-field class="demo-full-width"> <input matInput [matDatepicker]="picker" placeholder="Incident Date" [(ngModel)]="incident.date" name="date" > <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle> <mat-datepicker touchUi="true" #picker></mat-datepicker> </mat-form-field> </td> </tr> <tr> <td colspan="2"> <mat-form-field class="demo-full-width"> <input matInput placeholder="Incident Category" [(ngModel)]="incident.category" name="category"> </mat-form-field> </td> </tr> <tr> <td > <mat-form-field class="demo-full-width"> <mat-select placeholder="Application Owner" [(ngModel)]="incident.owner" name="owner"> <mat-option style="background-color:grey">-- Select--</mat-option> <mat-option style="background-color:cornsilk" value="1">BRV</mat-option> <mat-option style="background-color:cornsilk" value="2">FRTB</mat-option> <mat-option style="background-color:cornsilk" value="3">FSA</mat-option> </mat-select> </mat-form-field> </td> <td> <mat-form-field> <mat-select placeholder="Symphony Group" [(ngModel)]="incident.symphony_group" name="symphony_group"> <mat-option style="background-color:grey">-- Select --</mat-option> <mat-option style="background-color:cornsilk" value="1">MMO SheHacks</mat-option> <mat-option style="background-color: cornsilk" value="2">MMO IT INDIA</mat-option> </mat-select> </mat-form-field> </td> </tr> <tr> <td> <mat-form-field> <mat-select placeholder="Application" [(ngModel)]="incident.application" name="application"> <mat-option style="background-color:grey">-- Select--</mat-option> <mat-option style="background-color:cornsilk" value="1">BRV</mat-option> <mat-option style="background-color:cornsilk" value="2">FRTB</mat-option> <mat-option style="background-color:cornsilk" value="3">FSA</mat-option> </mat-select> </mat-form-field> </td> <td> <mat-form-field> <mat-select placeholder="Status" [(value)]="status" [(ngModel)]="incident.status" name="status"> <mat-option style="background-color:grey">-- Select --</mat-option> <mat-option style="background-color: green" value="1">Available</mat-option> <mat-option style="background-color: orange" value="2">Reduced</mat-option> <mat-option style="background-color: red" value="3">Unavailable</mat-option> </mat-select> </mat-form-field> </td> </tr> <tr> <td colspan="2"> </td> </tr> <tr> <td colspan="2" class="content-center"> <button style="margin:5px" mat-raised-button color="accent" (click)="submit()">Submit Incident</button> <button style="margin:5px" mat-raised-button color="accent" (click)="reset()">Clear</button> <button style="margin:5px" mat-raised-button color="accent">Raise BGCR</button> <button style="margin:5px" mat-raised-button color="accent">Raise Jira</button> </td> </tr> </table> </form> </mat-card-content> </mat-card> </div> 您需要移除 <h1>INCIDENT MANAGEMENT SYSTEM</h1> 或将其放入 <mat-toolbar-row> 内。我无法在垫子工具栏中填充图像有什么帮助吗？

通过更少的 Java API 调用来映射 Google 云端硬盘内容的有效方法

大家好，我有一个代码，用于列出共享驱动器中存在的文件（以便稍后下载并创建相同的文件夹路径）目前我做这样的事情：哈希映射大家好，我有一个代码，用于列出共享驱动器中存在的文件（以便稍后下载并创建相同的文件夹路径）目前我正在做这样的事情： HashMap<String, Strin> foldersPathToID = new HashMap<>(); //searching all folders first saving their IDs searchAllFoldersRecursive(folderName.trim(), driveId, foldersPathToID); //then listing files in all folders HashMap<String, List<File>> pathFile = new HashMap<>(); for (Entry<String, String> pathFolder : foldersPathToID.entrySet()) { List<File> result = search(Type.FILE, pathFolder.getValue()); if (result.size() > 0) { String targetPathFolder = pathFolder.getKey().trim(); pathFile.putIfAbsent(targetPathFolder, new ArrayList<>()); for (File file : result) { pathFile.get(targetPathFolder).add(file); } } } 递归方法在哪里： private static void searchAllFoldersRecursive(String nameFold, String id, HashMap<String, String> map) throws IOException, RefreshTokenException { map.putIfAbsent(nameFold, id); List<File> result; result = search(Type.FOLDER, id); // dig deeper if (result.size() > 0) { for (File folder : result) { searchAllFoldersRecursive(nameFold + java.io.File.separator + normalizeName(folder.getName()), folder.getId(), map); } } } 搜索功能是： private static List<com.google.api.services.drive.model.File> search(Type type, String folderId) throws IOException, RefreshTokenException { String nextPageToken = "go"; List<File> driveFolders = new ArrayList<>(); com.google.api.services.drive.Drive.Files.List request = service.files() .list() .setQ("'" + folderId + "' in parents and mimeType" + (type == Type.FOLDER ? "=" : "!=") + "'application/vnd.google-apps.folder' and trashed = false") .setPageSize(100).setFields("nextPageToken, files(id, name)"); while (nextPageToken != null && nextPageToken.length() > 0) { try { FileList result = request.execute(); driveFolders.addAll(result.getFiles()); nextPageToken = result.getNextPageToken(); request.setPageToken(nextPageToken); return driveFolders; } catch (TokenResponseException tokenError) { if (tokenError.getDetails().getError().equalsIgnoreCase("invalid_grant")) { log.err("Token no more valid removing it Please retry"); java.io.File cred = new java.io.File("./tokens/StoredCredential"); if (cred.exists()) { cred.delete(); } throw new RefreshTokenException("Creds invalid will retry re allow for the token"); } log.err("Error while geting response with token for folder id : " + folderId, tokenError); nextPageToken = null; } catch (Exception e) { log.err("Error while reading folder id : " + folderId, e); nextPageToken = null; } } return new ArrayList<>(); } 我确信有一种方法可以通过很少的 api 调用（甚至可能是一个调用？）对每个文件（使用文件夹树路径）进行正确的映射，因为在我的版本中，我花了很多时间进行调用 service.files().list().setQ("'" + folderId+ "' in parents and mimeType" + (type == Type.FOLDER ? "=" : "!=") + "'application/vnd.google-apps.folder' and trashed = false").setPageSize(100).setFields("nextPageToken, files(id, name)"); 每个子文件夹至少一次......并且递归搜索所有内容需要很长时间。最后，映射比下载本身花费的时间更多...... 我搜索了文档，也在此处搜索，但没有找到任何内容来列出具有一个库的所有驱动器调用任何想法？我想使用专用的 java API 来获取共享 GoogleDrive 中的所有文件及其相对路径，但调用次数尽可能少。提前感谢您的时间和答复我建议您使用高效的数据结构和逻辑来构建文件夹树并将文件映射到其路径，如下所示 private static void mapDriveContent(String driveId) throws IOException { // HashMap to store folder ID to path mapping HashMap<String, String> idToPath = new HashMap<>(); // HashMap to store files based on their paths HashMap<String, List<File>> pathToFile = new HashMap<>(); // Fetch all files and folders in the drive List<File> allFiles = fetchAllFiles(driveId); // Build folder path mapping and organize files for (File file : allFiles) { String parentId = (file.getParents() != null && !file.getParents().isEmpty()) ? file.getParents().get(0) : null; String path = buildPath(file, parentId, idToPath); if (file.getMimeType().equals("application/vnd.google-apps.folder")) { idToPath.put(file.getId(), path); } else { pathToFile.computeIfAbsent(path, k -> new ArrayList<>()).add(file); } } // Now, pathToFile contains the mapping of paths to files // Your logic to handle these files goes here } private static List<File> fetchAllFiles(String driveId) throws IOException { // Implement fetching all files and folders here // Make sure to handle pagination if necessary // ... } private static String buildPath(File file, String parentId, HashMap<String, String> idToPath) { // Build the file path based on its parent ID and the idToPath mapping // ... }

如果类型是从变量进行数据绑定，则通过 <object> 标签在 Angular 中显示 pdf 无法在 Chrome 中工作

我正在尝试通过标签在 Chrome 中显示 pdf。如果我手动编写类型，它会起作用：不工作但是... 我正在尝试通过 <object> 标签在 Chrome 中显示 pdf。如果我手动写 type: 就可以了 <object [data]="getUrl(true)" type="application/pdf"> Not working </object> 但如果我从变量读取类型则不会： <object [data]="getUrl(true)" [type]="file.mimeType"> Not working </object> 为什么？这是一些非常奇怪的错误，还是我做错了什么可怕的事情。这里是plunkr。它可以在 Firefox 中运行（所有 4 个对象都会显示），但不能在 Chrome 中运行 (Version 74.0.3729.169 (Official Build) (64-bit))：我遇到了同样的问题，但我不明白原因。就我而言，我决定在基于 Blink 引擎的浏览器中使用“embed”元素而不是“object”元素。 <ng-template #blinkPlatformViewer> <embed [src]="getUrl(true)" [type]="file.mimeType"/> </ng-template> <object *ngIf="!isBlinkPlatform; else blinkPlatformViewer" [data]="getUrl(true)" [type]="file.mimeType"> Not working </object> import { Platform } from '@angular/cdk/platform'; import { DomSanitizer, SafeResourceUrl } from '@angular/platform-browser'; export class FileContentComponent { constructor(private readonly sanitizer: DomSanitizer, private readonly platform: Platform) { } get isBlinkPlatform(): boolean { return this.platform.BLINK; } }

为什么我在GWT中无法隐藏UiBinder中的DialogBox？

在 Test.ui.xml 中测试一些小部件.. 在Test.ui.xml <g:DialogBox ui:field="wishlistDialogBox" autoHide="true"> <g:caption>Test</g:caption> <g:HTMLPanel> some widgets..</g:HTMLPanel> </g:DialogBox> 运行后，应用程序仍然显示DialogBox，所以我尝试在TestView.java中为“wishlistDialogBox”设置隐藏，但没有成功。 @UiField DialogBox wishlistDialogBox; @Inject public TestView(final Binder binder) { widget = binder.createAndBindUi(this); wishlistDialogBox.hide(); } 然后我在TestPresenter.java中为它设置了隐藏，但仍然不起作用 @Override protected void onBind() { super.onBind(); getView().getWishlistDialogBox().hide(); } 怎么了，古德尔根本没有解释。另外，DialogBox如何重复使用？当谈论将它们添加到 DOM 时，DialogBox（以及一般的 PopupPanel）不像任何其他小部件那样工作。您永远不应该像以前那样将它们直接附加到它（即 panel.add(yourDialogBox) 或在 UiBinder XML 文件中）。相反，您应该创建它们，然后简单地调用 hide()/show() 以及类似的方法，以使其显示/隐藏（即，在 DOM 的末尾附加/分离）。对我有用的是与任何其他小部件分开创建一个对话框。所以它有自己的 Java 文件和自己的 ui.xml 文件： UiBinder xml文件： <ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui"> <g:DialogBox ui:field="dialog"> <g:caption>My Dialog</g:caption> <g:HTMLPanel> <g:Button ui:field="closeButton" text="close" /> </g:HTMLPanel> </g:DialogBox> </ui:UiBinder> Java 文件： public class MyDialog { // here you do not inherit anything private static MyDialogUiBinder uiBinder = GWT.create(MyDialogUiBinder.class); interface MyDialogUiBinder extends UiBinder<Widget, MyDialog> { } @UiField DialogBox dialog; @UiField Button closeButton; public MyDialog() { // make cast to DialogBox dialog = (DialogBox) (uiBinder.createAndBindUi(this)); } public void hide() { dialog.hide(); } public void show() { dialog.center(); } @UiHandler("closeButton") public void onClick(ClickEvent event) { hide(); } } 最后我想出了一个办法，那就是把DialogBox放到一个看不见的HTMLPanel <g:HTMLPanel visible="false"> <g:DialogBox ui:field="wishlistDialogBox" autoHide="true"> <g:caption>Test</g:caption> <g:HTMLPanel> some widgets..</g:HTMLPanel> </g:DialogBox> </g:HTMLPanel> 然后像往常一样调用 show & hide DialogBox，即使 DialogBox 被包裹在一个看不见的 DialogBox 中，它也会显示 HTMLPanel。 getView().getWishlistDialogBox().show();

SecurityException：不允许启动服务Intent { act=com.google.android.c2dm.intent.REGISTER pkg=com.google.android.gms （有额外功能）}

我尝试从 Google 获取我的 GCM 注册 ID。我的代码：字符串SENDER_ID =“722*****53”; /** * 向 GCM 服务器异步注册应用程序。 * * 存储注册信息... 我尝试从 Google 获取我的 GCM 注册 ID。我的代码： String SENDER_ID = "722******53"; /** * Registers the application with GCM servers asynchronously. * <p> * Stores the registration ID and the app versionCode in the application's * shared preferences. */ private void registerInBackground() { new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { String msg = ""; try { if (gcm == null) { gcm = GoogleCloudMessaging.getInstance(context); } regid = gcm.register(SENDER_ID); msg = "Device registered, registration ID=" + regid; // You should send the registration ID to your server over // HTTP, so it // can use GCM/HTTP or CCS to send messages to your app. sendRegistrationIdToBackend(); // For this demo: we don't need to send it because the // device will send // upstream messages to a server that echo back the message // using the // 'from' address in the message. // Persist the regID - no need to register again. storeRegistrationId(context, regid); } catch (IOException ex) { msg = "Error :" + ex.getMessage(); // If there is an error, don't just keep trying to register. // Require the user to click a button again, or perform // exponential back-off. } return msg; } @Override protected void onPostExecute(String msg) { mDisplay.append(msg + "\n"); } }.execute(null, null, null); } 我收到错误： 03-01 19:15:36.261: E/AndroidRuntime(3467): FATAL EXCEPTION: AsyncTask #1 03-01 19:15:36.261: E/AndroidRuntime(3467): java.lang.RuntimeException: An error occured while executing doInBackground() 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.os.AsyncTask$3.done(AsyncTask.java:299) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.lang.Thread.run(Thread.java:841) 03-01 19:15:36.261: E/AndroidRuntime(3467): Caused by: java.lang.SecurityException: Not allowed to start service Intent { act=com.google.android.c2dm.intent.REGISTER pkg=com.google.android.gms (has extras) } without permission com.google.android.c2dm.permission.RECEIVE 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.app.ContextImpl.startServiceAsUser(ContextImpl.java:1800) 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.app.ContextImpl.startService(ContextImpl.java:1772) 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.content.ContextWrapper.startService(ContextWrapper.java:480) 03-01 19:15:36.261: E/AndroidRuntime(3467): at com.google.android.gms.gcm.GoogleCloudMessaging.b(Unknown Source) 03-01 19:15:36.261: E/AndroidRuntime(3467): at com.google.android.gms.gcm.GoogleCloudMessaging.register(Unknown Source) 03-01 19:15:36.261: E/AndroidRuntime(3467): at com.example.gcm.DemoActivity$1.doInBackground(DemoActivity.java:177) 03-01 19:15:36.261: E/AndroidRuntime(3467): at com.example.gcm.DemoActivity$1.doInBackground(DemoActivity.java:1) 03-01 19:15:36.261: E/AndroidRuntime(3467): at android.os.AsyncTask$2.call(AsyncTask.java:287) 03-01 19:15:36.261: E/AndroidRuntime(3467): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 03-01 19:15:36.261: E/AndroidRuntime(3467): ... 4 more 这是我的清单： <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.manyexampleapp" android:installLocation="preferExternal" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="11" android:targetSdkVersion="18" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.GET_ACCOUNTS" /> <uses-permission android:name="android.permission.WAKE_LOCK" /> <uses-permission android:name="com.example.manyexampleapp.c2dm.permission.RECEIVE" /> <uses-permission android:name="com.example.manyexampleapp.gcm.permission.C2D_MESSAGE" /> <permission android:name="com.example.manyexampleapp.gcm.permission.C2D_MESSAGE" android:protectionLevel="signature" /> <application android:name="com.zoomer.ifs.BaseApplication" android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" /> <activity android:name="com.zoomer.ifs.MainActivity" android:label="@string/app_name" android:configChanges="orientation|keyboardHidden|screenSize" android:launchMode="singleTop">  </activity>   <receiver android:name="com.example.gcm.GcmBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND" > <intent-filter>  <action android:name="com.google.android.c2dm.intent.RECEIVE" /> <category android:name="com.example.manyexampleapp" /> </intent-filter> </receiver> <service android:name="com.example.gcm.GcmIntentService" /> <activity android:name="com.example.gcm.DemoActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>  <activity android:name="com.example.db.DbActivity" android:label="@string/app_name" > <intent-filter> </intent-filter> </activity> <activity android:name="com.example.http.RestGetActivity" android:label="@string/app_name" android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" > </activity> <activity android:name="com.example.fb.FacebookLoginActivity" android:label="@string/app_name" >  </activity> <activity android:name="com.example.http.SendFeedbackActivity" android:label="@string/app_name" >  </activity> <activity android:name="com.zoomer.general.SearchNearbyOffersActivity" android:label="@string/app_name" > <intent-filter> </intent-filter> </activity> <activity android:name="com.facebook.LoginActivity" android:label="@string/app_name" > <intent-filter> </intent-filter> </activity> <activity android:name="com.example.manyexampleapp.StoresListActivity" > <intent-filter> </intent-filter> </activity> <activity android:name="com.example.fb.ShareActivity" > <intent-filter> </intent-filter> </activity> <activity android:name="com.example.notifications.NotificationsActivity" > <intent-filter> </intent-filter> </activity> <activity android:name="com.example.fb2.no_use.MainActivity" > <intent-filter> </intent-filter> </activity> <activity android:name="com.zoomer.offers.OffersListActivity" >  </activity> <activity android:name="com.example.http.SearchNearbyOffersActivity" >  </activity> <service android:name="com.example.geo.LocationService" android:enabled="true" /> <receiver android:name="com.example.manyexampleapp.BootReceiver" > <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> <action android:name="com.example.manyexampleapp.LocationService.LOCATION_BROAD_MSG" /> </intent-filter> </receiver> <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id" /> </application> </manifest> 改变 <uses-permission android:name="com.example.manyexampleapp.c2dm.permission.RECEIVE" /> 到  <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> 您收到异常是因为您尚未定义所需的权限如果应用程序开发后安装了播放服务，可能会发生 com.google.android.c2dm.permission.RECEIVE 权限已被授予但 android 仍在抱怨同样的错误。在这种情况下，您必须完全重新安装开发的应用程序才能使此权限发挥作用。我认为你必须检查 Kotlin 版本兼容性。

防止打开的窗口覆盖 opener 的 `close` 方法

我有一个 test1.html 文件，仅包含以下代码： janela = window.open("http://localhost/test2.html","_blank","width=1000,height=400,left=600,top=0"); </...</desc> <question vote="1"> <p>我有一个 <pre><code>test1.html</code></pre> 文件，其中仅包含以下代码：</p> <pre><code><script> janela = window.open("http://localhost/test2.html","_blank","width=1000,height=400,left=600,top=0"); </script> </code></pre> <p>上面的代码将打开窗口<pre><code>test2.html</code></pre>，其中包含以下代码：</p> <pre><code><script> opener.window.janela.close = null; </script> </code></pre> <p>现在，在窗口 <pre><code>test1.html</code></pre> 上，如果我尝试关闭刚刚使用 <pre><code>janela.close()</code></pre> 打开的窗口，我将无法这样做。</p> <p>我知道在 <pre><code>noopener</code></pre> 方法中使用 <pre><code>window.open</code></pre> 会阻止 <pre><code>test2.html</code></pre> 访问 <pre><code>test1.html</code></pre> 但是它也会阻止我在 <pre><code>test1.html</code></pre> 关闭 <pre><code>test2.html</code></pre>。</p> <p>那么我怎样才能可靠地打开 <pre><code>window</code></pre> 并能够在将来自信地关闭它？</p> <p><strong>根据@mplungjan</strong></p>进行编辑 <p>在@mplungjan的帮助下，我做到了：</p> <pre><code>myClose = window.close; janela = window.open("https://a2eestrutural.eng.br/?fdfk","_blank","width=1000,height=400,left=600,top=20"); janela.myClose = window.myClose; </code></pre> <p>窗口打开后，我尝试执行<pre><code>janela.myClose();</code></pre>并收到此错误消息：</p> <pre><code>An attempt was made to break through the security policy of the user agent. </code></pre> <p>知道我该如何继续吗？</p> </question> <answer tick="false" vote="0"> <p>为什么要有这个代码？如果您可以控制打开的内容...</p> <p>无论如何，请在打开窗口的脚本之前尝试此操作</p> <pre><code>const myClose = window.close; const janela = window.open("http://localhost/test2.html","_blank","width=1000,height=400,left=600,top=0"); .... janela.myClose() </code></pre> </answer> </body></html>

如何使用 XML 查询功能从 XML 节点查询值

我有以下 XML 数据：声明@x XML 设置@x=' 订购我有以下 XML 数据： DECLARE @x XML SET @x='<Orders> <HeadingSection> <DocumentNameCode>Order</DocumentNameCode> <DetailSection> <LineItem LineItemNumber="10"> <ItemId>123456789</ItemId> <ItemTypeId>EN</ItemTypeId> <AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>ABC</ItemId> <TypeId>SA</TypeId> </Item> </AdditionalProductId> <AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>XYZ</ItemId> <TypeId>IN</TypeId> </Item> </AdditionalProductId> </LineItem> </DetailSection> <SummarySection/> </HeadingSection> </Orders>' 我已经使用了以下T-Sql脚本（必须有光标） DECLARE @xmlQuittungPOS XML DECLARE quittungCurPOS CURSOR FOR SELECT QuittungXMLPOS = T.X.query('.') FROM @x.nodes('/Orders/HeadingSection/DetailSection/LineItem') AS T(X) OPEN quittungCurPOS FETCH NEXT FROM quittungCurPOS INTO @xmlQuittungPOS WHILE @@FETCH_STATUS = 0 BEGIN INSERT INTO dbo.tempPOS ( GTIN ,edi_PIA_SA ,edi_PIA_IN ) SELECT GTIN = T.X.query('/LineItem[ItemTypeId = "BP"]').value('(/LineItem/ItemId)[1]','VARCHAR(100)') -- funktioniert / works ,edi_PIA_SA = T.X.query('/LineItem/AdditionalProductId/Item[TypeId = "SA"]').value('(/LineItem/AdditionalProductId/Item/ItemId)[1]','VARCHAR(255)') -- funktioniert nicht / doesn't work ,edi_PIA_IN = T.X.query('/LineItem/AdditionalProductId/Item[TypeId = "IN"]').value('(/LineItem/AdditionalProductId/Item/ItemId)[1]','VARCHAR(255)') -- funktioniert nicht / doesn't work FROM @xmlQuittungPOS.nodes('/LineItem') AS T(X) FETCH NEXT FROM quittungCurPOS INTO @xmlQuittungPOS END CLOSE quittungCurPOS DEALLOCATE quittungCurPOS 1.) GTIN -> 查询有效 2.) PIA_SA 和 PIA_IN -> 查询不起作用问题：我认为这是因为 '/LineItem/AdditionalProductId/Item[TypeId = "SA"]' 位于附加节点中。问题：如何获取中TypeId“SA”和“IN”的值 <AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>**ABC**</ItemId> <TypeId>SA</TypeId> </Item> </AdditionalProductId> <AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>**XYZ**</ItemId> <TypeId>IN</TypeId> </Item> </AdditionalProductId> with .value('(/LineItem/AdditionalProductId/Item/ItemId)[1]','VARCHAR(255)') ！处于 1 级！ -- 我知道。级别 1 上的 SA -> .value('(/LineItem/AdditionalProductId/Item/ItemId)[1]','VARCHAR(255)') 级别 2 上的 SA -> .value('(/LineItem/AdditionalProductId/Item/ItemId)[2]','VARCHAR(255)') 但我现在需要查询类型谢谢不清楚你在这里追求什么，所以我回答两者。如果您想要每个 Item 节点 1 行，那么您只需对 nodes 节点使用 Item 并获取 value 文本的 ItemId： DECLARE @xml xml = '<AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>**ABC**</ItemId> <TypeId>SA</TypeId> </Item> </AdditionalProductId> <AdditionalProductId Qualifier="ProductId"> <Item> <ItemId>**XYZ**</ItemId> <TypeId>IN</TypeId> </Item> </AdditionalProductId> '; SELECT AP.I.value('(ItemId/text())[1]','varchar(15)') AS ItemId, AP.I.value('(TypeId/text())[1]','varchar(15)') AS TypeId FROM (VALUES(@XML))V(X) --To give impression it's against a table CROSS APPLY V.X.nodes ('AdditionalProductId/Item')AP(I); 但是，如果您希望每个不同的 TypeID 值各有 1 列，您可以在 XML 中进行过滤： SELECT X.AP.value('(AdditionalProductId/Item[TypeId[(text()[1])="SA"]]/ItemId/text())[1]','varchar(15)') AS ItemSA, X.AP.value('(AdditionalProductId/Item[TypeId[(text()[1])="IN"]]/ItemId/text())[1]','varchar(15)') AS ItemIN FROM @xml.nodes ('/')X(AP); --To give impression it's against a table 或者使用之前的查询并使用条件聚合： WITH Items AS( SELECT AP.I.value('(ItemId/text())[1]','varchar(15)') AS ItemId, AP.I.value('(TypeId/text())[1]','varchar(15)') AS TypeId FROM @xml.nodes ('AdditionalProductId/Item')AP(I)) SELECT MAX(CASE TypeID WHEN 'SA' THEN ItemId END) AS ItemSA, MAX(CASE TypeID WHEN 'IN' THEN ItemId END) AS ItemIN FROM Items;

使用 libcurl 时出现“SSL CA 证书问题”错误

我使用--openssldir=< path to ssl >/ssl（链接到/etc/ssl）构建了openssl 1.1.1，并使用--with-ssl=< path to openssl >构建了curl 7.76.1。编译了以下代码： #包括我使用--openssldir=< path to ssl >/ssl（链接到/etc/ssl）构建了openssl 1.1.1，并使用--with-ssl=< path to openssl >构建了curl 7.76.1。编译了以下代码： #include <iostream> #include <curl/curl.h> int main() { CURL *curl = curl_easy_init(); if (curl) { struct curl_slist *headers = NULL; headers = curl_slist_append(headers, "Accept: */*"); headers = curl_slist_append(headers, "Content-Type: application/json"); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_URL, "https://<address>"); curl_easy_setopt(curl, CURLOPT_POST, 1); curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "<some data>"); curl_easy_perform(curl); curl_slist_free_all(headers) } curl_easy_cleanup(curl); } 当我运行此代码时，出现错误： curl_easy_operation() failed : Problem with the SSL CA cert (path? access rights?) 我在 strace 中看到，它正在尝试打开“/etc/pki/tls/certs/ca-bundle.crt” 但在我的机器（Ubuntu 12 和 Ubuntu 14）中没有文件夹“/etc/pki”。为什么curl使用“/etc/pki”而不是“/etc/ssl”？我怎样才能强制它使用“/etc/ssl”？我尝试使用 --without-nss 构建curl，但没有成功。编辑：我的解决方案是添加以下代码： ifstream caBundleFile("/etc/pki/tls/certs/ca-bundle.crt"); if (caBundleFile.good()) { curl_easy_setopt(curl, CURLOPT_CAINFO, "/etc/pki/tls/certs/ca-bundle.crt"); caBundleFile.close(); } else { curl_easy_setopt(curl, CURLOPT_CAPATH, "/etc/ssl/certs"); } 有两种流行的存储根证书的格式。第一个适用于 RHEL/Centos 等，第二个适用于 Ubuntu 等发行版。对于未来的读者，答案是设置curl CA路径 #include <iostream> #include <curl/curl.h> const std::string curlCertPath = "./keys/curl-ca-bundle.crt"; int main() { CURL *curl; CURLcode res; curl_global_init(CURL_GLOBAL_ALL); curl = curl_easy_init(); if (curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_CAINFO, curlCertPath.c_str()); res = curl_easy_perform(curl); if (res == CURLE_OK) { std::cout << "Curl worked" << std::endl; } else { std::cout << "Error: curl failed: " << curl_easy_strerror(res) << std::endl; } curl_easy_cleanup(curl); } curl_global_cleanup(); return 0; }

更新 MyBatis 中的值列表 - SQLSyntaxErrorException

更新 MyBatis 中的值列表时出现 SQLSyntaxErrorException。我正在使用分隔符=“;”在 forecach 标签中，但我仍然收到错误。下面是我的sql查询更新 MyBatis 中的值列表时出现 SQLSyntaxErrorException。我在 forecach 标签中使用 separator=";" ，但仍然收到错误。下面是我的sql查询 <update id="updateComplianceCheckListResponse" parameterType="java.util.List"> <foreach collection="list" item="response" separator=";"> UPDATE AM_ComplianceChecklistResponse SET complianceDetailsId = #{response.complianceDetailsId}, complianceChecklistId = #{response.complianceChecklistId}, questionResponse = #{response.questionResponse}, expiryDate = #{response.expiryDate}, documentName = #{response.documentName}, comments = #{response.comments} WHERE id = #{response.id} </foreach> </update> org.apache.ibatis.exceptions.PersistenceException：更新数据库时出错。原因：java.sql.SQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在“UPDATE AM_ComplianceChecklistResponse”附近使用的正确语法 SET complianceDetailsId = 1, com' at line 10 错误可能存在于 com/am/dao/managecompliance/ComplianceChecklistResponse.xml 中错误可能涉及ComplianceChecklistResponse.updateComplianceCheckListResponse-Inline 设置参数时出现错误 SQL： UPDATE AM_ComplianceChecklistResponse SETcomplianceDetailsId = ？，complianceChecklistId = ？，questionResponse = ？，expiryDate = ？，documentName = ？，comments = ？哪里 id = ？ ; UPDATE AM_ComplianceChecklistResponse SET complianceDetailsId = ?、complianceChecklistId = ?、questionResponse = ?、expiryDate = ?、documentName = ?、comments = ?哪里 id = ? 原因：java.sql.SQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在“UPDATE AM_ComplianceChecklistResponse”附近使用的正确语法 SET complianceDetailsId = 1, com' at line 10 at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:196) at com.am.dao.managecompliance.ComplianceChecklistResponseDAO.updateComplianceCheckListResponse(ComplianceChecklistResponseDAO.java:50) at com.am.service.managecompliance.ComplianceChecklistResponseService.updateComplianceCheckListResponse(ComplianceChecklistResponseService.java:122) at com.am.webservice.controller.managecompliance.ManageComplianceController.updateComplianceCheckListResponse(ManageComplianceController.java:230) at com.am.webservice.controller.managecompliance.ManageComplianceController$$FastClassBySpringCGLIB$$e3100610.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy.invokeMethod(CglibAopProxy.java:386) at org.springframework.aop.framework.CglibAopProxy.access$000(CglibAopProxy.java:85) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:704) at com.am.webservice.controller.managecompliance.ManageComplianceController$$EnhancerBySpringCGLIB$$4a5751a4.updateComplianceCheckListResponse(<generated>) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) at javax.servlet.http.HttpServlet.service(HttpServlet.java:555) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:337) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:122) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:116) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346) at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346) at com.dbp.security.auth.spring.StatelessAuthenticationFilter.doFilter(StatelessAuthenticationFilter.java:55) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346) at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346) at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:221) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:670) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:928) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1794) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:833) 引起：java.sql.SQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在“UPDATE AM_ComplianceChecklistResponse”附近使用的正确语法设置合规性详细信息 ID = 1, com' 在第 10 行在 com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120) 在com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException（SQLExceptionsMapping.java:122）在com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal（ClientPreparedStatement.java:916）在 com.mysql.cj.jdbc.ClientPreparedStatement.execute(ClientPreparedStatement.java:354) 在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0（本机方法）在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 在java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在 java.base/java.lang.reflect.Method.invoke(Method.java:568) 在org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke（PreparedStatementLogger.java:59）在 jdk.proxy5/jdk.proxy5.$Proxy81.execute（来源未知）在 org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47) 在 org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74) 在 org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50) 在 org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117) 在 org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76) 在 org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:194) ...省略69个常用框架修复为 <insert id="updateComplianceCheckListResponse" parameterType="java.util.List"> insert into AM_ComplianceChecklistResponse (id,complianceDetailsId,complianceChecklistId,questionResponse,expiryDate,documentName,comments) VALUES <foreach collection="list" item="response" separator="," open="(" close=")"> #{response.id}, #{response.complianceDetailsId},#{response.complianceChecklistId},#{response.questionResponse},#{response.expiryDate},#{response.documentName},#{response.comments} </foreach> on duplicate key update complianceDetailsId= VALUES(complianceDetailsId), complianceChecklistId=VALUES(complianceChecklistId), questionResponse=VALUES(questionResponse), expiryDate=VALUES(expiryDate), documentName=VALUES(documentName), comments=VALUES(comments) </insert>

MVC ASP.NET Core Identity，创建登录、注册操作。 AuthController

公共类AuthController：控制器 { SignInManager _signInManager { 获取； } UserManager _userManager { 获取； } 角色管理器 public class AuthController : Controller { SignInManager<AppUser> _signInManager { get; } UserManager<AppUser> _userManager { get; } RoleManager<IdentityRole> _roleManager { get; } public AuthController(SignInManager<AppUser> signInManager, UserManager<AppUser> userManager, RoleManager<IdentityRole> roleManager) { _signInManager = signInManager; _userManager = userManager; _roleManager = roleManager; } public IActionResult Login() { return View(); } [HttpPost] public async Task<IActionResult> Login(string? returnUrl,LoginVM vm) { AppUser user; if (!ModelState.IsValid) { return View(vm); } if (vm.UsernameOrEmail.Contains("@")) { user = await _userManager.FindByEmailAsync(vm.UsernameOrEmail); } else { user = await _userManager.FindByNameAsync(vm.UsernameOrEmail); } if (user == null) { ModelState.AddModelError("", "Username or password is wrong"); return View(vm); } var result = await _signInManager.PasswordSignInAsync(user, vm.Password, vm.IsRemember, true); if (!result.Succeeded) { if (result.IsLockedOut) { ModelState.AddModelError("", "Too many attempts wait until " + DateTime.Parse(user.LockoutEnd.ToString()).ToString("HH:mm")); } else { ModelState.AddModelError("", "Username or password is wrong"); } return View(vm); } if (returnUrl != null) { return LocalRedirect(returnUrl); } return RedirectToAction("Index","Home"); } public IActionResult Register() { return View(); } [HttpPost] public async Task<IActionResult> Register(RegisterVM vm) { if (!ModelState.IsValid) { return View(vm); } var user = new AppUser { Fullname = vm.Fullname, Email = vm.Email, UserName = vm.Username }; var result = await _userManager.CreateAsync(user, vm.Password); if (!result.Succeeded) { foreach (var error in result.Errors) { ModelState.AddModelError("", error.Description); } return View(vm); } var roleResult = await _userManager.AddToRoleAsync(user, Roles.Member.ToString()); if (!roleResult.Succeeded) { ModelState.AddModelError("", "Something went wrong. Please contact admin"); return View(vm); } return View(); } public async Task<IActionResult> Logout() { await _signInManager.SignOutAsync(); return RedirectToAction("Index", "Home"); } public async Task<bool> CreateRoles() { foreach (var item in Enum.GetValues(typeof(Roles))) { if (!await _roleManager.RoleExistsAsync(item.ToString())) { var result = await _roleManager.CreateAsync(new IdentityRole { Name = item.ToString() }); if (!result.Succeeded) { return false; } } } return true; } } } 所以，我在代码中搞乱了登录、注册和注销，现在这个 RoleManager 的事情让我摸不着头脑。我只是想为我的管理员用户提供一些额外的权力，但我有点不知道该怎么做。如果您能用简单的语言解释步骤或需要进行哪些更改来帮助我，那就太棒了。我的目标是让管理员用户在我的系统中体验更好，您对此的建议非常有用。尝试了解 RoleManager 的事情以及如何为我的管理员用户提供更多能力。您直接的帮助可能会对我解决这个问题产生很大的影响！定义管理员角色创建管理员用户更新注册流程： var roleResult =等待_userManager.AddToRoleAsync（用户，vm.IsAdmin？ Roles.Admin.ToString() : Roles.Member.ToString()); 使用管理员角色： [授权（角色=“管理员”）] 公共 IActionResult AdminDashboard() { // 特定于管理的逻辑 } 5.提升管理能力： if (User.IsInRole("管理员")) { // 特定于管理的逻辑 } 中间件配置： services.AddIdentity() .AddRoles() .AddEntityFrameworkStores(); 7.创建角色方法：公共无效配置（IApplicationBuilder 应用程序，IHostingEnvironment env） { // 其他中间件配置 // Create roles during application startup var authController = new AuthController(/* inject your dependencies here */); authController.CreateRoles().GetAwaiter().GetResult(); }

如何在 C++/WinRT (WinUI3) 中将图像从内存读取到 ImageSource？

[1] 我想在 XAML 中显示 Image 控件的图像，但该图像来自字节数组。我应该怎么办？图像格式可以是JPG、BMP或PNG之一。 [1] 我想在 XAML 中显示 Image 控件的图像，但该图像来自字节数组。我该怎么办？图像格式可以是 JPG、BMP 或 PNG 之一。 <Image x:Name="img"/> void MainWindow::myButton_Click(IInspectable const&, RoutedEventArgs const&) { unsigned long long size; // iamge data size const unsigned char* buf; // image data img().Source(???); // what should I do? } [2] 我尝试了InMemoryRandomAccessStream，但没有成功。我知道在C#中使用MemoryStream很方便，但是如何在C++中实现它？另一个问题是这个方法是否也适用于JPG和PNG格式的图像？ void MainWindow::myButton_Click(IInspectable const&, RoutedEventArgs const&) { unsigned long long size; // iamge data size const unsigned char* buf; // image data winrt::Microsoft::UI::Xaml::Media::Imaging::BitmapImage bmp; winrt::Windows::Storage::Streams::InMemoryRandomAccessStream stream; // How to read data from stream? bmp.SetSource(stream); img().Source(bmp); } [3] 现在功能已经实现了，但是还有两个问题 IAsyncAction MainWindow::myButton_Click(IInspectable const&, RoutedEventArgs const&) { unsigned long long size; // iamge data size const unsigned char* buf; // image data winrt::Microsoft::UI::Xaml::Media::Imaging::BitmapImage bmp; winrt::Windows::Storage::Streams::InMemoryRandomAccessStream stream; winrt::Windows::Storage::Streams::DataWriter dw(st.GetOutputStreamAt(0ULL)); dw.WriteBytes({ buf, size }); // This is very inefficient! co_await dw.StoreAsync(); dw.Close(); bmp.SetSource(stream); img().Source(bmp); stream.Close(); } 首先，我发现DataWriter::WriteBytes()确实是在复制数据。但我认为ImageSource只需要从我的buf中读取即可，不需要在读取之前将整个图像完全复制到流中。也许是类似MemoryView的东西，我这样想是不是错了？其次，DataWriter和InMemoryRandomAccessStream的Close()应该在哪里调用？ BitmapImage需要释放内存吗？这里有一个异步函数，我不知道应该写在哪里 [4] 根据IInspectable，我尝试了SHCreatMemStream并搜索了大量信息以提出另一个解决方案。目前的问题是，与方法[3]同样可行，但仍然会出现内存分配问题。 #include "Shlwapi.h" #include "shcore.h" #pragma comment(lib, "shlwapi.lib") void MainWindow::myButton_Click(IInspectable const&, RoutedEventArgs const&) { unsigned long long size; // iamge data size const unsigned char* buf; // image data winrt::Microsoft::UI::Xaml::Media::Imaging::BitmapImage bmp; IStream* stream{ SHCreateMemStream(buf, size) }; // Copying takes a lot of time static const GUID guidIRandomAccessStream = { 0x905a0fe1, 0xbc53, 0x11df, { 0x8c, 0x49, 0x00, 0x1e, 0x4f, 0xc6, 0x86, 0xda } }; winrt::Windows::Storage::Streams::IRandomAccessStream pRas{ }; CreateRandomAccessStreamOverStream(stream, BSOS_OPTIONS::BSOS_DEFAULT, guidIRandomAccessStream, (void**)&pRas); bmp.SetSource(stream); img().Source(bmp); } 通过性能测试，发现CreateRandomAccessStreamOverStream的时间是一致的，但是SHCreateMemStream消耗的时间与图像大小成正比。可以得出，SHCreateMemStream中创建流的过程也涉及到内存的复制。我对Windows编程中的Stream不是特别熟悉。创建流的过程一定会涉及到内存复制吗？从内存加载图像可以避免额外的开销吗？还有没有类似MemoryStreamView的结构来替代吗？还有一个问题，我知道新的图像肯定需要内存存储。 BitmapImage设置Stream为Source会接管Stream占用的内存吗？ Image控件设置BitmapImage作为Source会接管BitmapImage占用的内存吗？如果是这样的话，我可以接受Stream分配新的内存，否则仍然是一个效率问题。谢谢！！！！！！！使用Stream已经彻底解决了这个问题。如前四期所述。至于附加问题： ★1 使用 CreatStreamOnHGlobal 而不是 SHCreatMemStream。因为SHCreatMemStream在调用过程中会对传入的内存块参数进行另一次内存复制。 CreatStreamOnHGlobal 创建流后不执行内存复制。您可以先通过GlobalAlloc分配内存，写入所需的图像数据，然后调用CreatStreamOnHGlobal，无需任何时间开销。另外，可以将CreatStreamOnHGlobal的第二个参数设置为true，自动释放GlobalAlloc分配的内存。通过进程内存监控，我发现对于同一个程序，使用CreatStreamOnHGlobal的速度是SHCreatMemStream的两倍，并且不会导致内存泄漏。 ★2 创建的Stream需要调用Release方法减少一个引用。 IRandomAccessStream作为局部变量，会自动析构，无需主动释放。并且BitmapImage还管理一部分引用，这些引用在离开作用域后被释放。通过测试COM对象上Release方法的返回值，发现整个程序结束后引用计数又回到了0

Struts 2 与 Apache Shiro 集成时如何显示结果页面

使用： struts2 2.5.10，春天 4.x, struts2-spring-插件2.5.10，希罗1.4.0， Shiro-Spring 1.4.0。网络.xml：使用： struts2 2.5.10，春季 4.x， struts2-spring-插件2.5.10，四郎1.4.0， shiro-spring 1.4.0. web.xml： <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <display-name>Archetype Created Web Application</display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:beans.xml</param-value> </context-param> <filter> <filter-name>shiroFilter</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> <init-param> <param-name>targetFilterLifecycle</param-name> <param-value>true</param-value> </init-param> </filter> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter>  <filter-mapping> <filter-name>shiroFilter</filter-name> <url-pattern>/*</url-pattern> <dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher> <dispatcher>INCLUDE</dispatcher> <dispatcher>ERROR</dispatcher> </filter-mapping> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> beanx.xml： <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd "> <bean name="loginAction" class="example.shiro.action.LoginAction" > </bean> <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean"> <property name="securityManager" ref="securityManager" /> <property name="loginUrl" value="/login.jsp" /> <property name="filterChainDefinitions"> <value> /login.jsp = authc /logout = logout /* = authc </value> </property> </bean> <bean id="iniRealm" class="org.apache.shiro.realm.text.IniRealm"> <property name="resourcePath" value="classpath:shiro.ini" /> </bean> <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager"> <property name="realm" ref="iniRealm" /> </bean> <bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/> </beans> struts.xml： <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devMode" value="true" /> <package name="default" extends="struts-default"> <action name="list" class="loginAction" method="list"> <result name="success">/success.jsp</result> <result name="error">error.jsp</result> </action> </package> </struts> index.jsp： <body> <s:action name="list" /> </body> login.jsp 看起来像： <form name="loginform" action="" method="post"> <table align="left" border="0" cellspacing="0" cellpadding="3"> <tr> <td>Username:</td> <td><input type="text" name="username" maxlength="30"></td> </tr> <tr> <td>Password:</td> <td><input type="password" name="password" maxlength="30"></td> </tr> <tr> <td colspan="2" align="left"><input type="checkbox" name="rememberMe"><font size="2">Remember Me</font></td> </tr> <tr> <td colspan="2" align="right"><input type="submit" name="submit" value="Login"></td> </tr> </table> </form> LoginAction.list()： public String list() { Subject currentUser = SecurityUtils.getSubject(); if(currentUser.isAuthenticated()) {System.out.println("user : "+currentUser.getPrincipal()); System.out.println("You are authenticated!"); } else { System.out.println("Hey hacker, hands up!"); } return "success"; } shiro.ini： [users] root=123,admin guest=456,guest frank=789,roleA,roleB # role name=permission1,permission2,..,permissionN [roles] admin=* roleA=lightsaber:* roleB=winnebago:drive:eagle5 index.jsp、login.jsp、success.jsp放在webapp下我想要的是：输入LoginAction.list()需要进行身份验证，如果登录成功，则运行LoginAction.list()并返回"success"然后显示定义为Struts操作结果的success.jsp。现在登录成功后可以执行LoginAction.list()，但是success.jsp不显示，浏览器是空白页面。为什么？我找到了原因：我在index.jsp中使用了<s:action name="list" />，但是struts文档说如果我们想用<s:action>看到结果页面，那么我们必须将其属性executeResult设置为true，即就像<s:action name="list" executeResult="true"/>。在我看来，这有点奇怪，这个属性默认应该是 true。有一个示例，您应该如何使用 Shiro applicationContext.xml 进行配置： <property name="filterChainDefinitions"> <value> # some example chain definitions: /admin/** = authc, roles[admin] /** = authc # more URL-to-FilterChain definitions here </value> </property> 以 /admin/ 开头的 URL 通过角色 admin 进行保护，任何其他 URL 均不受保护。如果 Struts 操作和结果 JSP 不在受保护区域中，则会显示它们。

错误：在此 BlocBuilder<InternetBloc> Widget<InternetBloc, InternetState> 上方找不到正确的提供程序

我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder 上方找不到正确的 Provider 我在尝试将 flutter_bloc 集成到 flutter 项目中时遇到错误。错误：在此 BlocBuilder Widget 上方找不到正确的提供者这是我正在使用的代码示例。 internet_state.dart abstract class InternetState{} class InitialInternetState extends InternetState{} class LostConnectionInternetState extends InternetState{} class GainConnectionInternetState extends InternetState{} internet_event.dart abstract class InternetEvent{} class LostConnectionEvent extends InternetEvent{} class GainConnectionEvent extends InternetEvent{} internet_bloc.dart class InternetBloc extends Bloc<InternetEvent, InternetState>{ final Connectivity _connectivity = Connectivity(); StreamSubscription? streamSubscription; InternetBloc() : super(InitialInternetState()){ on<GainConnectionEvent>((event, emit) => emit(GainConnectionInternetState())); on<LostConnectionEvent>((event, emit) => emit(LostConnectionInternetState())); _connectivity.onConnectivityChanged.listen((event) { if(event == ConnectivityResult.mobile || event == ConnectivityResult.wifi){ add(GainConnectionEvent()); } else { add(LostConnectionEvent()); } }); } @override Future<void> close() { streamSubscription?.cancel(); return super.close(); } } main.dart class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), useMaterial3: true, ), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text(title),), body: SafeArea( child: Center(child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, )), ),); } } 我明白了。 ======== 小部件库捕获异常====================================== =================== 构建 MediaQuery(MediaQueryData(size: Size(392.7, 783.3), devicePixelRatio: 2.8, textScaler: noscaling, platformBrightness: Brightness.light, padding: EdgeInsets.zero, viewPadding: EdgeInsets.zero, viewInsets: EdgeInsets 时抛出以下 ProviderNotFoundException。零，systemGestureInsets：EdgeInsets（29.8，24.0，29.8，8.0），alwaysUse24HourFormat：假，accessibleNavigation：假，highContrast：假，onOffSwitchLabels：假，disableAnimations：假，invertColors：假，boldText：假，navigationMode：传统，gestureSettings：DeviceGestureSettings （touchSlop：8.0），显示功能：[]））：错误：无法在此 BlocBuilder Widget 之上找到正确的提供程序发生这种情况是因为您使用了不包含提供程序的 BuildContext 你的选择。有以下几种常见场景：您在main.dart中添加了一个新的提供程序并执行了热重载。要修复此问题，请执行热重启。您尝试阅读的提供商处于不同的路线。提供商具有“范围”。因此，如果您在路线中插入提供者，那么其他路线将无法访问该提供商。您使用了 BuildContext，它是您尝试读取的提供程序的祖先。确保 BlocBuilder 位于您的 MultiProvider/Provider 下。当您创建提供程序并尝试立即读取它时，通常会发生这种情况。例如，代替： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // Will throw a ProviderNotFoundError, because `context` is associated // to the widget that is the parent of `Provider<Example>` child: Text(context.watch<Example>().toString()), ); } 考虑使用builder，如下所示： Widget build(BuildContext context) { return Provider<Example>( create: (_) => Example(), // we use `builder` to obtain a new `BuildContext` that has access to the provider builder: (context, child) { // No longer throws return Text(context.watch<Example>().toString()); } ); } 如果这些解决方案都不起作用，请考虑在 StackOverflow 上寻求帮助： https://stackoverflow.com/questions/tagged/flutter The relevant error-causing widget was: SafeArea SafeArea:file:///Users/../Projects/flutterTest/bloc_test/lib/main.dart:37:13 When the exception was thrown, this was the stack: #0 Provider._inheritedElementOf (package:provider/src/provider.dart:343:7) #1 Provider.of (package:provider/src/provider.dart:293:30) #2 ReadContext.read (package:provider/src/provider.dart:649:21) #3 _BlocBuilderBaseState.initState (package:flutter_bloc/src/bloc_builder.dart:130:36) #4 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5602:55) #5 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5447:5) ... Normal element mounting (4 frames) #9 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4326:16) #10 Element.updateChild (package:flutter/src/widgets/framework.dart:3831:20) #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #12 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #13 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #14 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #15 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #16 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #17 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #18 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #19 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #20 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #21 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #22 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #23 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #24 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #25 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #26 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #27 StatelessElement.update (package:flutter/src/widgets/framework.dart:5547:5) #28 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #29 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #30 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #31 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #32 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #33 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #34 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #35 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #36 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #37 Element.updateChildren (package:flutter/src/widgets/framework.dart:3964:32) #38 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6896:17) #39 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #41 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #42 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #43 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #45 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #46 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #47 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #48 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #49 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #50 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #51 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #52 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #53 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #54 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #55 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #56 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #57 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #58 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #59 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #60 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #61 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #62 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #63 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #64 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #65 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #66 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #67 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #68 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #69 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6743:14) #70 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #71 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #72 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #73 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #74 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #75 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #76 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #77 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #78 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #79 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #80 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #81 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #82 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #83 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #84 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #85 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #86 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #87 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #88 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #89 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #90 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #91 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #92 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #93 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #94 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #95 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #96 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #97 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #98 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #99 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #100 ProxyElement.update (package:flutter/src/widgets/framework.dart:5800:5) #101 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #102 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #103 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5634:11) #104 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #105 StatefulElement.update (package:flutter/src/widgets/framework.dart:5657:5) #106 Element.updateChild (package:flutter/src/widgets/framework.dart:3815:15) #107 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5496:16) #108 Element.rebuild (package:flutter/src/widgets/framework.dart:5187:7) #109 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2895:19) #110 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:984:21) #111 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457:5) #112 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15) #113 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1255:9) #114 SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:978:7) #118 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) (elided 3 frames from class _Timer and dart:async-patch) ==================================================================================================== 我不想使用像 MultiProvider 这样的全局提供程序。您应该在某处创建 InternetBloc 并提供它。 MultiProvider 本身并不是全局的，它只是多个。更多信息在这里：https://bloclibrary.dev/#/flutterbloccoreconcepts?id=blocprovider 所以，如果您不想使用全局提供程序，它将看起来像这样： class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( child: BlocProvider<InternetBloc>( create: ( context) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } } 要使用 BlocBuilder，您需要在 Widget 树中放置一个 BlocProvider。最佳实践是将其放置得尽可能深。在您的情况下，只需将 BlocProvider 放在 BlocBuilder 之上。此外 MultiProvider / MultiBlocProvider 不是全局 Provider。它只是一个提供多个 Provider/BlocProvider 的便捷小部件。 class MyHomePage extends StatelessWidget { const MyHomePage({super.key, required this.title}); final String title; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(title), ), body: SafeArea( child: Center( // Now everything below that can access the InternetBloc child: BlocProvider<InternetBloc>( create: (_) => InternetBloc(), child: BlocBuilder<InternetBloc, InternetState>( builder: (context, state) { return const Text("hello"); }, ), ), ), ), ); } }

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