/// <summary>

/// 声明并定义命令。

/// </summary>

RoutedCommand ClearCommand = new RoutedCommand("Clear", typeof(MainWindow));

/// <summary>

/// 初始化命令。崔有来 2014-7-30 06:23:10

/// </summary>

void InitializeCommand()

{

    // 为命令设置快捷键。

    this.ClearCommand.InputGestures.Add(new KeyGesture(Key.C, ModifierKeys.Alt));

    // 将命令赋给命令源。

    this.Button1.Command = this.ClearCommand;

    // 指定命令目标。

    this.Button1.CommandTarget = this.TextBoxA;

    // 创建命令关联并安置在外围控件上。

    CommandBinding cb = new CommandBinding();

    cb.Command = this.ClearCommand;

    cb.CanExecute += new CanExecuteRoutedEventHandler(cb_CanExecute);

    cb.Executed += new ExecutedRoutedEventHandler(cb_Executed);

    this.StackPanel1.CommandBindings.Add(cb);

}

/// <summary>

/// 当命令送达目标后执行该方法。崔有来 2014-7-30 06:27:16

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

void cb_Executed(object sender, ExecutedRoutedEventArgs e)

{

    this.TextBoxA.Clear();

    e.Handled = true;

}

/// <summary>

/// 当探测命令是否可执行时调用该方法。崔有来 2014-7-30 06:26:20

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

void cb_CanExecute(object sender, CanExecuteRoutedEventArgs e)

{

    if (string.IsNullOrEmpty(this.TextBoxA.Text) == true) e.CanExecute = false;

    else e.CanExecute = true;

    e.Handled = true;

}