WPF 编程新手我来自 WinForms。我有两个正在运行的 WinForms 项目/解决方案，我想将它们转换为 WPF。我设法通过 XMAL 和 MainWindowViewModel，但碰壁了。 在互联网上检查了工作代码，以使“按钮”文本在按下时发生变化。 我的问题是我无法将按钮上下文的文本更改为不同的内容。 我想在按下时将按钮文本从当前更改为“正在运行...”，然后命令完成后更改回之前的文本。
我的 XAML：
<Window x:Class="XPR_AppBuilderSuiteWpf.MainWindow"
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:XPR_AppBuilderSuiteWpf"
mc:Ignorable="d"
Title="XPR-AppBuilder Suite WPF Version" Height="680" Width="820">
<Window.DataContext>
<local:MainWindowViewModel/>
</Window.DataContext>
<Window.Resources>
<Style x:Key="GroupToggleStyle" TargetType="RadioButton"
BasedOn="{StaticResource {x:Type ToggleButton}}">
<Setter Property="Foreground" Value="Blue"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsErrorProcess}"
Value="True">
<DataTrigger.Setters>
<Setter Property="Foreground" Value="Red"/>
</DataTrigger.Setters>
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid Background="Beige">
<Grid.RowDefinitions>
<RowDefinition Height="250"/>
<RowDefinition Height="70"/>
<RowDefinition Height="260"/>
<RowDefinition Height="80"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Background="LightBlue" Grid.Row="0" Height="295" Margin="0,0,0,4">
<GroupBox x:Name="groupBox" Header="AB XML Reader" Width="778" Height="120" Margin="10,-160,10,14">
<StackPanel Height="251">
<Button x:Name="btnSeletXMLFile" Content="{Binding sSelectXMLFile}" Command="{Binding btnSelectXMLFile}" HorizontalAlignment="Left"
Margin="5,10,0,0" VerticalAlignment="Top" Height="20" Width="76"/>
<Button x:Name="btnFindTags" Content="{Binding sFindTags}" Command="{Binding btnFindTags}" Margin="-452,-20,0,0" Height="20" Width="72"/>
<Button x:Name="btnSelectFolder" Content="{Binding sSelectFolder}" Command="{Binding btnSelectFolder}" HorizontalAlignment="Left"
Margin="245,-19,0,25" VerticalAlignment="Top" Height="20" Width="72"/>
<CheckBox x:Name="chkBCallflowXML" Content="Run Callflow XML" IsChecked="{Binding IschkBCallflowXML}" IsEnabled="{Binding IsProcessingData}"
HorizontalAlignment="Left" Margin="5,-14,0,0" VerticalAlignment="Top" Height="15" Width="113"/>
<CheckBox x:Name="chkBWorkspaceXML" Content="Run Worksapce XML" IsChecked="{Binding IschkBWorkspaceXML}" IsEnabled="{Binding IsProcessingData}" HorizontalAlignment="Left" Margin="126,-14,0,0" VerticalAlignment="Top" Height="15" Width="130"/>
<CheckBox x:Name="chkBAppXML" Content="Run Application XML" IsChecked="{Binding IschkBAppXML}" IsEnabled="{Binding IsProcessingData}" HorizontalAlignment="Left" Margin="268,-14,0,0" VerticalAlignment="Top" Height="15" Width="131"/>
<CheckBox x:Name="chkBVariablesXML" Content="Run Variables XML" IsChecked="{Binding IschkBVariablesXML}" IsEnabled="{Binding IsProcessingData}" HorizontalAlignment="Left" Margin="407,-14,0,0" VerticalAlignment="Top" Height="15" Width="125"/>
<CheckBox x:Name="chkBDontAddFilename" Content="Don't add file name" IsChecked="{Binding IschkBDontAddFilename}" IsEnabled="{Binding IsProcessingData}" HorizontalAlignment="Left" Margin="534,-14,0,0" VerticalAlignment="Top"/>
<Label x:Name="label" Content="Filter exclusion" HorizontalAlignment="Left" Margin="5,6,0,0" VerticalAlignment="Top"/>
<TextBox x:Name="txtBFilter" Text="{Binding txtBFilter}" HorizontalAlignment="Left" Margin="96,-20,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
</StackPanel>
</GroupBox>
<Label x:Name="label2" Content="Result window:" HorizontalAlignment="Left" Margin="-786,137,0,0" VerticalAlignment="Top"/>
<TextBox x:Name="txtBResult" Text="{Binding txtBResult}" HorizontalAlignment="Left" Margin="-777,164,19,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="762" Height="50"/>
</StackPanel>
<Label x:Name="lblStatus" Content="Status:" Margin="20,5,720,0" VerticalAlignment="Top" Height="30" Grid.Row="1"/>
<TextBox x:Name="txtBStatus" Text="{Binding txtBStatus}" Grid.Row="1" Margin="13,33,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Height="30" Width="777"/>
<StackPanel Orientation="Horizontal" Background="LightSkyBlue" Grid.Row="2">
<GroupBox x:Name="groupBox2" Header="AB Deployed Reader" Width="778" Height="200" Margin="10,-20,10,14">
<StackPanel >
<Label x:Name="lbABDeployed" Content="{Binding lblABDeployed}" HorizontalAlignment="Left" Margin="10,8,0,0" VerticalAlignment="Top" Height="125" Width="743"/>
<Button x:Name="btnStartABDeployedReader" Content="{Binding sStart}" Command="{Binding btnStartABDeployedReader}" HorizontalAlignment="Left" Margin="10,13,0,15" VerticalAlignment="Center" Height="20" Width="50"/>
<Button x:Name="btnOpenOutput" Command="{Binding btnOpenOutput}" Content="Open output file" Height="20" Width="100" Margin="-502,-35,0,15" VerticalAlignment="Center"/>
<CheckBox x:Name="chkBSingle" Content="Single application configuration" IsChecked="{Binding IschkBSingle}" IsEnabled="{Binding IsProcessingData}" Margin="196,-33,0,0" Width="198" HorizontalAlignment="Left" VerticalAlignment="Top" Height="24"/>
</StackPanel>
</GroupBox>
</StackPanel>
<StackPanel Orientation="Horizontal" Background="LightCyan" Grid.Row="3">
<CheckBox x:Name="chkBClearLog" Content="Clear error log" IsChecked="{Binding IschkBClearLog}" IsEnabled="{Binding IsProcessingData}" HorizontalAlignment="Left" Margin="10,14,0,0" VerticalAlignment="Top"/>
<RadioButton GroupName="btnErrorLog" Command="{Binding btnErrorLog}" Content="{Binding ErrorText}" Width="80"
Margin="32,-25,5,5" VerticalAlignment="Center" Style="{StaticResource GroupToggleStyle}" Height="20" IsEnabled="{Binding IsError}"/>
<Label x:Name="lblVersion" Content="{Binding lblVersion}" HorizontalAlignment="Left" Margin="-210,39,0,0" VerticalAlignment="Top"/>
<!--<Button x:Name="btnError" Content="Error Log" Command="{Binding btnErrorLog}" HorizontalAlignment="Left" Margin="-92,43,0,0" VerticalAlignment="Top" Height="20" Width="50"/>-->
</StackPanel>
</Grid>
</Window>
我的 MainWindowViewModel：（使用 CommunityToolkit.Mvvm 创建的 ViewModel 尚未完全封装在 MVVM 中）。部分代码以减少数据量。
namespace XPR_AppBuilderSuiteWpf
{
public partial class MainWindowViewModel : ObservableRecipient
{
#region Variables/Fields
private string _txtBFilter;
private string _txtBResult;
private string _txtBStatus;
private string _lblVersion;
private string _lblABDeployed;
private bool _ischkBCallflowXML;
private bool _ischkBWorkspaceXML;
private bool _ischkBAppXML;
private bool _ischkBVariablesXML;
private bool _ischkBDontAddFilename;
private bool _ischkBSingle;
private bool _ischkBClearLog;
private bool _isError;//enables the button to be clicked on else it is not enabled.
private bool _isErrorProcess;//use to set the error button color.
private bool _isProcessingData;//to enable or disable the checkboxes, buttons or other controls
private string _sSelectXMLFile = string.Empty;
private string _sFindTags = string.Empty;
private string _sSelectFolder = string.Empty;
private string _sStart = string.Empty;
#endregion
#region RelayCommands
//aka buttons or "Commands={Binding...}"
public AsyncRelayCommand btnSelectXMLFile { get; set; }
public AsyncRelayCommand btnFindTags { get; set; }
public AsyncRelayCommand btnSelectFolder { get; set; }
public AsyncRelayCommand btnStartABDeployedReader { get; set; }
public AsyncRelayCommand btnOpenOutput { get; set; }
public AsyncRelayCommand btnErrorLog { get; set; }
#endregion
#region Properties
//aka textboxes, checkboxes, listboxes etc
public bool IschkBCallflowXML
{
get => _ischkBCallflowXML;
set
{
if (_ischkBCallflowXML == value)
return;
_ischkBCallflowXML = value;
OnPropertyChanged(nameof(IschkBCallflowXML));
}
}
public bool IschkBWorkspaceXML
{
get => _ischkBWorkspaceXML;
set
{
if (_ischkBWorkspaceXML == value)
return;
_ischkBWorkspaceXML = value;
OnPropertyChanged(nameof(IschkBWorkspaceXML));
}
}
public bool IschkBAppXML
{
get => _ischkBAppXML;
set
{
if (_ischkBAppXML == value)
return;
_ischkBAppXML = value;
OnPropertyChanged(nameof(IschkBAppXML));
}
}
public bool IschkBVariablesXML
{
get => _ischkBVariablesXML;
set
{
if (_ischkBVariablesXML == value)
return;
_ischkBVariablesXML = value;
OnPropertyChanged(nameof(IschkBVariablesXML));
}
}
public bool IschkBDontAddFilename
{
get => _ischkBDontAddFilename;
set
{
if (_ischkBDontAddFilename == value)
return;
_ischkBDontAddFilename = value;
OnPropertyChanged(nameof(IschkBDontAddFilename));
}
}
public string txtBFilter
{
get => _txtBFilter;
set
{
if (_txtBFilter == value)
return;
_txtBFilter = value;
OnPropertyChanged(nameof(txtBFilter));
}
}
public string txtBResult
{
get => _txtBResult;
set
{
if (_txtBResult == value)
return;
_txtBResult = value;
OnPropertyChanged(nameof(txtBResult));
}
}
public string txtBStatus
{
get => _txtBStatus;
set
{
if (_txtBStatus == value)
return;
_txtBStatus = value;
OnPropertyChanged(nameof(txtBStatus));
}
}
public string lblABDeployed
{
get => _lblABDeployed;
set
{
if (_lblABDeployed == value)
return;
_lblABDeployed = value;
OnPropertyChanged(nameof(lblABDeployed));
}
}
public bool IschkBSingle
{
get => _ischkBSingle;
set
{
if (_ischkBSingle == value)
return;
_ischkBSingle = value;
OnPropertyChanged(nameof(IschkBSingle));
}
}
public bool IschkBClearLog
{
get => _ischkBClearLog;
set
{
if (_ischkBClearLog == value)
return;
_ischkBClearLog = value;
OnPropertyChanged(nameof(IschkBClearLog));
}
}
public bool IsProcessingData
{
get => _isProcessingData;
set
{
if (_isProcessingData == value)
return;
_isProcessingData = value;
OnPropertyChanged(nameof(IsProcessingData));
}
}
public string lblVersion
{
get => _lblVersion;
set
{
if (_lblVersion == value)
return;
_lblVersion = value;
OnPropertyChanged(nameof(lblVersion));
}
}
public bool IsError
{
get => _isError;
set
{
if (_isError == value)
return;
_isError = value;
OnPropertyChanged(nameof(IsError));
}
}
public bool IsErrorProcess
{
get => _isErrorProcess;
set
{
if (_isErrorProcess == value)
return;
_isErrorProcess = value;
OnPropertyChanged(nameof(IsErrorProcess));
}
}
public string sSelectXMLFile
{
get => _sSelectXMLFile;
set
{
if (_sSelectXMLFile == value)
return;
_sSelectXMLFile = value;
OnPropertyChanged(nameof(sSelectXMLFile));
}
}
public string sFindTags
{
get => _sFindTags;
set
{
if (_sFindTags == value)
return;
_sFindTags = value;
OnPropertyChanged(nameof(sFindTags));
}
}
public string sSelectFolder
{
get => _sSelectFolder;
set
{
if (_sSelectFolder == value)
return;
_sFindTags = value;
OnPropertyChanged(nameof(sSelectFolder));
}
}
public string sStart
{
get => _sStart;
set
{
if (_sStart == value)
return;
_sFindTags = value;
OnPropertyChanged(nameof(sStart));
}
}
//End of declarations.
//https://stackoverflow.com/questions/76871709/using-mvvm-communitytoolkit-to-change-button-foreground-or-background
[ObservableProperty]
private string? errorText;
#endregion
public MainWindowViewModel()
{
txtBFilter = string.Empty;
txtBResult = string.Empty;
txtBStatus = string.Empty;
lblVersion = string.Empty;
lblABDeployed = string.Empty;
ErrorText = "Error Log";
IsError = false;
IsProcessingData = true;//to enable or disable the checkboxes, buttons or other controls
_sSelectXMLFile = "Select a XML";
_sFindTags = "Find Tags";
_sSelectFolder = "Select Folder";
_sStart = "Start";
string sTemp = System.Reflection.Assembly.GetEntryAssembly().FullName;
Globals.sApplicationName = sTemp.Substring(0, sTemp.IndexOf(","));
Globals.sEFApplicationName = sTemp.Substring(0, sTemp.IndexOf(","));
string[] aSplit = sTemp.Split(',');
lblVersion = "Version: " + aSplit[0] + " " + aSplit[1];
#region Button initialization
btnSelectXMLFile = new AsyncRelayCommand(OnbtnSelectXMLFileExecute, () => true);
btnFindTags = new AsyncRelayCommand(OnbtnFindTagsExecute, () => true);
btnSelectFolder = new AsyncRelayCommand(OnbtnSelectFolderExecute, () => true);
btnOpenOutput = new AsyncRelayCommand(OnbtnOpenOutputExecute, () => true);
btnStartABDeployedReader = new AsyncRelayCommand(OnbtnStartABDeployedReaderExecute, () => true);
btnErrorLog = new AsyncRelayCommand(OnbtnErrorLogExecute, () => true);
lblABDeployed = "This program will read an Xpressions correl or full export file.\n\r" +
"Then create an Excel workbook in the folder the DB was specified.\n\r" +
"All header values/names are those of AppBuilder as seen when deployed and written to the correl.";
// Register a message in some module
WeakReferenceMessenger.Default.Register<StatusMessages>(this, (r, m) =>
{
// Handle the message here, with r being the recipient and m being the
// input message. Using the recipient passed as input makes it so that
// the lambda expression doesn't capture "this", improving performance.
UpdateStatusMessage(m.Value);
});
#endregion
}
private async Task OnbtnSelectXMLFileExecute()
{
if (IschkBClearLog == true)
ClearErrorLog();
string sHold = _sSelectXMLFile, sResult = string.Empty;
_sSelectXMLFile = "Running...";
OpenFileDialog openFile = new OpenFileDialog();
openFile.Multiselect = true;
openFile.Title = "Select Application Builder XML file(s)"; //!!sets the dialog box title!!
openFile.FileName = null;
openFile.DefaultExt = "xml";
openFile.Filter = "AppBuilder (*.xml)|*.xml|All files (*.*)|*.*";
if (openFile.ShowDialog() == true)//if not true then it is cancel so skip
{
WeakReferenceMessenger.Default.Send(new StatusMessages($"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} - Starting XML file processing."));
ErrorFile.WriteError("======SelectXMLFile=====", "", 0);
IsErrorProcess = false;
await Task.Run(() =>
{
sResult = ReadABXMLTasks.SeletXMLFileTask(IschkBDontAddFilename, openFile, IschkBCallflowXML, IschkBAppXML, IschkBVariablesXML,
IschkBWorkspaceXML);
});
//Work on this button click does not work
if (Globals.bErrorOn == true)
{
IsErrorProcess = IsErrorProcess is true;
IsError = true;
}
}
_sSelectXMLFile = sHold;
txtBResult = sResult;
}
我希望这是足够的代码。我又是 WPF 新手。显示按钮“btnSelectXMLFile”的代码。我希望将您的帮助纳入其他按钮，然后融入到未来的项目中。
您的问题是您更改了 OnbtnSelectXMLFileExecute() 中的字段 _sSelectXMLFile = "正在运行...";
代替房产
sSelectXMLFile = "正在运行...";
这可以防止 NotifyPropertyChanged 事件被触发。如果事件没有被触发，UI 就不会改变。