Popup中ListBox的SelectChange事件关闭弹出窗体后主窗体点击无效BUG

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：

<UserControl x:Class="WpfApplication1.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:WpfApplication1"
             mc:Ignorable="d"
                 d:DesignHeight="30" d:DesignWidth="200">
    <Grid>
        <Grid x:Name="PART_Container">
            <DockPanel Margin="0,0,1,0">
                <ToggleButton x:Name="PART_ToggBtn" DockPanel.Dock="Right" BorderThickness="1" BorderBrush="#959595" Margin="-1,0,0,0"
                          IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:UserControl1}}">
                    >
                </ToggleButton>
                <TextBox  x:Name="txtAutoComplete" />
            </DockPanel>
        </Grid>
        <Popup x:Name="PART_Popup" Opacity="0" Width="{Binding ElementName=PART_Container,Path=ActualWidth}"
               IsOpen="{Binding Path=IsDropDownOpen,Mode=OneWay, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:UserControl1}}"
               PopupAnimation="Slide" Placement="Bottom" StaysOpen="False" AllowsTransparency="True"
               PlacementTarget="{Binding ElementName=txtAutoComplete}" VerticalOffset="0" MinHeight="50" MaxHeight="300">
            <ListBox x:Name="listboxSuggestion" BorderBrush="Transparent" BorderThickness="0">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Item1}"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Popup>
    </Grid>
</UserControl>

逻辑代码：

public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
            List<Tuple<string, string, string>> tupes = new List<Tuple<string, string, string>>();
            Enumerable.Range(1, 10).Select(p => p.ToString().PadLeft(3, '0')).ToList().ForEach(p => tupes.Add(new Tuple<string, string, string>(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
    }

步骤二：新建个Window窗体DialogWin

xaml代码

<Window x:Class="WpfApplication1.DialogWin"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Title="DialogWin" Height="88.846" Width="210">
    <Grid>
        <local:UserControl1 Width="120" Height="22" x:Name="mySelect"  />
    </Grid>
</Window>

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

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBox x:Name="textBox" HorizontalAlignment="Left" Height="23" Margin="44,32,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
        <TextBox  HorizontalAlignment="Left" Height="23" Margin="198,32,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
        <TextBox  HorizontalAlignment="Left" Height="23" Margin="350,32,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
        <Button x:Name="button" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="44,82,0,0"/>
        <Button x:Name="button1" Content="弹出对话框" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="156,82,0,0" Click="button1_Click"/>
 
    </Grid>
</Window>

　　cs代码

/// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    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();
        }
    }