可以请提供一个示例,说明如何实现ICommandSource接口.当我想要我的UserControl,它没有能力在xaml中指定命令,以具有这种能力.并且当用户点击CustomControl时,能够处理命令.
解决方法
这里有一个例子：
@H_502_6@public partial class MyUserControl : UserControl,ICommandSource
{
public MyUserControl()
{
InitializeComponent();
}
public ICommand Command
{
get { return (ICommand)GetValue(CommandProperty); }
set { SetValue(CommandProperty,value); }
}
public static readonly DependencyProperty CommandProperty =
DependencyProperty.Register("Command",typeof(ICommand),typeof(MyUserControl),new UIPropertyMetadata(null));
public object CommandParameter
{
get { return (object)GetValue(CommandParameterProperty); }
set { SetValue(CommandParameterProperty,value); }
}
// Using a DependencyProperty as the backing store for CommandParameter. This enables animation,styling,binding,etc...
public static readonly DependencyProperty CommandParameterProperty =
DependencyProperty.Register("CommandParameter",typeof(object),new UIPropertyMetadata(null));
public IInputElement CommandTarget
{
get { return (IInputElement)GetValue(CommandTargetProperty); }
set { SetValue(CommandTargetProperty,value); }
}
// Using a DependencyProperty as the backing store for CommandTarget. This enables animation,etc...
public static readonly DependencyProperty CommandTargetProperty =
DependencyProperty.Register("CommandTarget",typeof(IInputElement),new UIPropertyMetadata(null));
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
var command = Command;
var parameter = CommandParameter;
var target = CommandTarget;
var routedCmd = command as RoutedCommand;
if (routedCmd != null && routedCmd.CanExecute(parameter,target))
{
routedCmd.Execute(parameter,target);
}
else if (command != null && command.CanExecute(parameter))
{
command.Execute(parameter);
}
}
}
请注意,CommandTarget属性仅用于RoutedCommands
