void OpenCmdExecuted(object target, ExecutedRoutedEventArgs e)
{
MessageBox.Show("The command has been invoked.");
}
void OpenCmdCanExecute(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = true;
}
(4)如何设置Command Target并进行绑定Command Binding?
XAML代码:
<StackPanel>
<Menu>
<MenuItem Command="ApplicationCommands.Paste"
CommandTarget="{Binding ElementName=mainTextBox}" />
</Menu>
<TextBox Name="mainTextBox"/>
</StackPanel>
C#代码:
StackPanel mainStackPanel = new StackPanel();
TextBox mainTextBox= new TextBox();
Menu stackPanelMenu = new Menu();
MenuItem pasteMenuItem = new MenuItem();
stackPanelMenu.Items.Add(pasteMenuItem);
mainStackPanel.Children.Add(stackPanelMenu);
mainStackPanel.Children.Add(mainTextBox);
pasteMenuItem.Command = ApplicationCommands.Paste;
以上例子全是单条命令绑定的情形,事实上,你也可以多个按钮多条命令绑定到同一控件上,比如:
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Orientation="Horizontal" Height="25">
<Button Command="Cut" CommandTarget="{Binding ElementName=textBoxInput}" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
<Button Command="Copy" CommandTarget="{Binding ElementName=textBoxInput}" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
<Button Command="Paste" CommandTarget="{Binding ElementName=textBoxInput}" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
<Button Command="Undo" CommandTarget="{Binding ElementName=textBoxInput}" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
<Button Command="Redo" CommandTarget="{Binding ElementName=textBoxInput}" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>
<TextBox x:Name="textBoxInput" Width="200"/>
</StackPanel>
| 第1页: WPF命令简述 | 第2页: 关于Command的四个概念 |
| 第3页: 四个小问题 | 第4页: 如何设置Command Target并进行绑定Comm... |