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MouseDown是冒泡事件,因此仅当不会在子级别处理它时才会触发 要捕获相同的内容,您需要使用PreviewMouseDown事件,它是一个隧道事件
冒泡
隧道
或者通过AddHandler设置事件
AddHandler
InitializeComponent(); AddHandler(FrameworkElement.MouseDownEvent, new MouseButtonEventHandler(Button_MouseDown), true);
MouseDown event not working WPF