WPF 中的 Command 命令

<Window x:Class="CommandDemo.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:CommandDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <StackPanel x:Name="stackpanel" >
            <Button x:Name="button1"  Content="send command"></Button>
            <TextBox x:Name="textboxA" Margin="5,0" Height="100"></TextBox>
            <TextBox x:Name="textboxB" Margin="5,0" Height="100"></TextBox>
        </StackPanel>
    </Grid>
</Window>
 
 
C# 代码
 
 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.InitializeCommand();
        }
        private RoutedCommand ClearCmd = new RoutedCommand("clear", typeof(MainWindow));
        private void InitializeCommand()
        {
            this.ClearCmd.InputGestures.Add(new KeyGesture(Key.C, ModifierKeys.Alt));
 
            this.button1.Command = this.ClearCmd;
            this.button1.CommandTarget = this.textboxA;
 
 
            CommandBinding cb = new CommandBinding();
            cb.Command = this.ClearCmd;
            cb.CanExecute += new CanExecuteRoutedEventHandler(cb_CanExecute);
            cb.Executed += new ExecutedRoutedEventHandler(cb_Executed);
            this.stackpanel.CommandBindings.Add(cb);
        }
 
        private void cb_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            this.textboxA.Clear();
        }
 
        private void cb_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
        }
    }