WPF的BUG!弹出框的 自定义控件里有Popup, Popup里面放一个ListBox  在ListBox中的SelectionChange事件触发关闭弹出框后，主窗体存在一定概率卡死（但点击标题又能用的BUG）   步骤一： 新建个自定义WPF控件UserControl Xaml代码： > 逻辑代码： public partial class UserControl1 : UserControl { public UserControl1() { InitializeComponent(); List> tupes = new List>(); Enumerable.Range(1, 10).Select(p => p.ToString().PadLeft(3, '0')).ToList().ForEach(p => tupes.Add(new Tuple(p, p, p))); listboxSuggestion.ItemsSource = tupes; listboxSuggestion.SelectionChanged += (o1, e1) => { RoutedEventArgs args = new RoutedEventArgs(EnterDownEvent, o1); //选中项改变触发 this.RaiseEvent(args); }; } #region 回车触发事件 //声明和注册路由事件 public static readonly RoutedEvent EnterDownEvent = EventManager.RegisterRoutedEvent( "EnterDown", RoutingStrategy.Bubble, typeof(EventHandler), typeof(UserControl1)); //CLR事件包装 public event RoutedEventHandler EnterDown { add { this.AddHandler(EnterDownEvent, value); } remove { this.RemoveHandler(EnterDownEvent, value); } } #endregion #region 是否打开下拉框 public bool IsDropDownOpen { get { return (bool)GetValue(IsDropDownOpenProperty); } set { SetValue(IsDropDownOpenProperty, value); } } public static readonly DependencyProperty IsDropDownOpenProperty = DependencyProperty.Register("IsDropDownOpen", typeof(bool), typeof(UserControl1), new PropertyMetadata(false)); #endregion } 步骤二： 新建个Window窗体DialogWin xaml代码 cs代码 public partial class DialogWin : Window { public DialogWin() { InitializeComponent(); mySelect.EnterDown += (o1, e1) => { this.Close(); }; } } 　　步骤三，在主窗体弹出DialogWin xaml代码 　　cs代码 ///

/// MainWindow.xaml 的交互逻辑 ///

public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void button1_Click(object sender, RoutedEventArgs e) { var s = new DialogWin(); s.Owner = this; s.WindowStartupLocation = WindowStartupLocation.CenterOwner; s.ShowDialog(); } } 运行程序.... 解决方案： 开启线程延迟关闭弹出体【最无语做法】 代码下载