所以我真的被困了2天。我一直在搜索stackoverflow和谷歌跟随许多指南,但没有帮助:/。所以我正在尝试从appsettings json文件中检索数据,因为我将数据存储在那里作为我的标准设置文件。
我想读一个json数组 - > iv'调用我的部分“Locations”和我的键“Location”,其中我的值是一个json数组。目前,该阵列中只有汽车公司名称不是真实数据。真实数据是文件路径。
我正在使用vs2017与.net core 2.0或2.1
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; set; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc()
.AddJsonOptions(config =>
{
config.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
});
services.AddOptions();
services.AddSingleton<IConfiguration>(Configuration);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddEnvironmentVariables()
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
if (env.IsDevelopment())
{
app.UseBrowserLink();
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
Configuration = builder.Build();
}
这是我的初创班。
"Locations": {
"Location": [ "Ford", "BMW", "Fiat" ]
},
我的json。
namespace MediaCenter.Models
{
public class Locations
{
public List<string> location { get; set; }
}
}
我的课程,因为我读到了DI系统的.net core 2.0所需要的。
public IActionResult Settings()
{
var array = _configuration.GetSection("Locations").GetSection("Location");
var items = array.Value.AsEnumerable();
return View();
}
我的控制器数据。
为了记录当我在“var array”处创建一个断点时,我可以在提供者和成员中看到我的值存储在其中,所以我想我没有对数组进行正确的调用?因为我被困住了,所以如果我得到一个好的工作,它会真的有帮助:(。
有几件事是错的。
Configuration
,而不是在ConfigureServices(services)
中。Children
,所以你需要在你的部分做GetChildren()
。以下是您需要在Startup.cs
中更改的内容
// Replace IConfiguration with IHostingEnvironment since we will build
// Our own configuration
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddEnvironmentVariables()
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
// Set the new Configuration
Configuration = builder.Build();
}
在您的控制器中,您现在可以使用以下内容:
public IActionResult Settings()
{
var array = Configuration.GetSection("Locations:Location")
.GetChildren()
.Select(configSection => configSection.Value);
return View();
}
编辑
问题是appsettings.json格式不正确。一切都被配置为Logging
部分的孩子。下面是更新和正确的json,我添加了额外的},
并从底部删除了}
。
{
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Warning"
}
},
"DBConnection": {
"Host": "",
"UserName": "",
"Password": ""
},
"Locations": {
"Location": [ "Ford", "BMW", "Fiat" ]
},
"VideoExtensions": {
"Extensions": []
}
}
对于WebHost.CreateDefaultBuilder
的Program.cs
,没有必要使用new ConfigurationBuilder()
。尝试以下选项:
选项1从IConfiguration
获取价值
public class OptionsController : Controller
{
private readonly IConfiguration _configuration;
public OptionsController(IConfiguration configuration)
{
_configuration = configuration;
}
public IActionResult Index()
{
var locations = new Locations();
_configuration.GetSection("Locations").Bind(locations);
var items = locations.location.AsEnumerable();
return View();
}
}
选项在Options
中配置Startup
services.Configure<Locations>(Configuration.GetSection("Locations"));
public class OptionsController : Controller
{
private readonly Locations _locations;
public OptionsController(IOptions<Locations> options)
{
_locations = options.Value;
}
public IActionResult Index()
{
var items2 = _locations;
return View();
}
}