如何将Close命令绑定到按钮

Question

最简单的方法是实现ButtonClick事件处理程序和调用Window.Close()方法,但是如何通过Command绑定来实现呢？

Answer 1

只需要一点XAML ......

<Window x:Class="WCSamples.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Window.CommandBindings>
        <CommandBinding Command="ApplicationCommands.Close"
                        Executed="CloseCommandHandler"/>
    </Window.CommandBindings>
    <StackPanel Name="MainStackPanel">
        <Button Command="ApplicationCommands.Close" 
                Content="Close Window" />
    </StackPanel>
</Window>

还有一点C#......

private void CloseCommandHandler(object sender, ExecutedRoutedEventArgs e)
{
    this.Close();
}

(改编自此MSDN文章)

Answer 2

实际上,没有C#代码就可以.关键是要使用互动:

<Button Content="Close">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="Click">
      <ei:CallMethodAction TargetObject="{Binding ElementName=window}" MethodName="Close"/>
    </i:EventTrigger>
  </i:Interaction.Triggers>
</Button>

为了使其工作,只需将x:Name窗口设置为"窗口",然后添加以下两个命名空间:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" 
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"

这要求您将Expression Blend SDK DLL添加到项目中,具体而言Microsoft.Expression.Interactions.

如果您没有Blend,可以在此处下载SDK .

Answer 3

我认为在现实世界的场景中,简单的点击处理程序可能比过于复杂的基于命令的系统更好,但你可以这样做:

使用本文中的RelayCommand http://msdn.microsoft.com/en-us/magazine/dd419663.aspx

public class MyCommands
{
    public static readonly ICommand CloseCommand =
        new RelayCommand( o => ((Window)o).Close() );
}

<Button Content="Close Window"
        Command="{X:Static local:MyCommands.CloseCommand}"
        CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, 
                           AncestorType={x:Type Window}}}"/>

Answer 4

我所知道的最简单的解决方案是将IsCancel属性设置为关闭的true Button:

<Button Content="Close" IsCancel="True" />

不需要绑定,WPF会自动为您完成!

参考:MSDN Button.IsCancel属性.

Answer 5

对于.NET 4.5 SystemCommands类将起作用（.NET 4.0 用户可以使用 WPF Shell Extension google - Microsoft.Windows.Shell 或 Nicholas Solution）。

    <Window.CommandBindings>
        <CommandBinding Command="{x:Static SystemCommands.CloseWindowCommand}" 
                        CanExecute="CloseWindow_CanExec" 
                        Executed="CloseWindow_Exec" />
    </Window.CommandBindings>
    <!-- Binding Close Command to the button control -->
    <Button ToolTip="Close Window" Content="Close" Command="{x:Static SystemCommands.CloseWindowCommand}"/>

在代码隐藏中，您可以像这样实现处理程序：

    private void CloseWindow_CanExec(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = true;
    }

    private void CloseWindow_Exec(object sender, ExecutedRoutedEventArgs e)
    {
        SystemCommands.CloseWindow(this);
    }