浅谈WPF中的命令(4)_各类编程_寂涯网络学习基地

RoutedCommand();

public MainWindow()

{

InitializeComponent();

}

private void MyCmd_CanExecute(object sender, CanExecuteRoutedEventArgs e)

{

if (e.Source != null)

{

e.CanExecute = true;

}

else { e.CanExecute = false; }

}

private void MyCmd_Executed(object sender, ExecutedRoutedEventArgs e)

{

if (e.Source != null)

{

var target = e.Source as Control;

if (target != null)

{

if (target.Foreground == Brushes.Blue)

{

target.Foreground = Brushes.Black;

}

else

{

target.Foreground = Brushes.Blue;

}

// 命令 public static RoutedCommand MyCommand = new RoutedCommand(); public MainWindow() { InitializeComponent(); } private void MyCmd_CanExecute(object sender, CanExecuteRoutedEventArgs e) { if (e.Source != null) { e.CanExecute = true; } else { e.CanExecute = false; } } private void MyCmd_Executed(object sender, ExecutedRoutedEventArgs e) { if (e.Source != null) { var target = e.Source as Control; if (target != null) { if (target.Foreground == Brushes.Blue) { target.Foreground = Brushes.Black; } else { target.Foreground = Brushes.Blue; } } } }

这样我们会有一个疑问，事件的引发者是谁？命令目标又是谁？

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