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;

}

}