CommandTarget属性

CommandTarget属性：

当一个command被executed的时候，指定这个事件的sender是谁。

例如如下xaml：

<StackPanel Name="FirstStackPanel"

Background="AliceBlue"

Focusable="True">

<!-- <SnippetCustom_RoutedCommandCommandBinding> -->

<StackPanel.CommandBindings>

<CommandBinding Command="{x:Static custom:Window1.ColorCmd}"

Executed="ColorCmdExecuted"

CanExecute="ColorCmdCanExecute"/>

</StackPanel.CommandBindings>

<!-- <SnippetCustom_RoutedCommandCommandBinding> -->

 

<Label>First StackPanel</Label>

 

<!-- <SnippetCustom_RoutedCommandCommandSource> -->

<Button Name="myButton" Command="{x:Static custom:Window1.ColorCmd}"

CommandParameter="ButtonOne"

CommandTarget="{Binding ElementName=FirstStackPanel}"

Content="CommandTarget = FristStackPanel" />

<!-- </SnippetCustom_RoutedCommandCommandSource> -->

</StackPanel>

对应后台的ColorCmdExecuted方法如下：

private void ColorCmdExecuted(object sender, ExecutedRoutedEventArgs e)

{

Panel target = e.Source as Panel;

if (target != null)

{

if (target.Background == Brushes.AliceBlue)

{

target.Background = Brushes.LemonChiffon;

}

else

{

target.Background = Brushes.AliceBlue;

}

 

}

}

则这里sender指的是CommandTarget所指的值，即FirstStackPanel，如果在xaml中不指定CommandTarget的话，这里的sender的值就会是触发这个commnad的myButton。