this.Dispatcher.BeginInvoke(DispatcherPriority.Background,
(Action)(() => { Keyboard.Focus(TextBox2); }));
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this.Dispatcher.BeginInvoke(DispatcherPriority.Background,
(Action)(() => { Keyboard.Focus(TextBox2); }));
<a target=_blank href="http://bbs.youkuaiyun.com/topics/370200371">原文链接</a>