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) =>
{
//this.IsDropDownOpen = false; //不能解决问题
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<RoutedEventArgs>),  
            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  
}复制

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) =>
{
//mySelect.IsDropDownOpen = false; //不起作用
//Dispatcher.InvokeAsync(Close); //还是会卡顿
this.Close();
};
}
}

步骤三，在主窗体弹出DialogWin

xaml代码

</Grid>  复制

　　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();  
    }  
}  复制

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