WPF之Command基础

1、界面布局，文本框和按钮

2、声明并定义命令

private RoutedCommand sayCmd = new RoutedCommand("Say", typeof(MainWindow));

3、指定命令的源(命令的发送者)

myBtn.Command = sayCmd;

4、指定快捷键

sayCmd.InputGestures.Add(new KeyGesture(Key.S, ModifierKeys.Alt));

5、指定命令目标

myBtn.CommandTarget = myText;

6、创建命令关联

CommandBinding cb = new CommandBinding();

cb.Command = sayCmd;

cb.CanExecute += new CanExecuteRoutedEventHandler(cb_CanExecute);

cb.Executed += new ExecutedRoutedEventHandler(cb_Executed);

7、把命令关联安置在外围控件上

grd.CommandBindings.Add(cb);

8、命令可执行逻辑

e.CanExecute = myText.Text.ToString() == "" ? false : true;

9、执行命令

MessageBox.Show(myText.Text);

10、执行效果如下