当应用程序关闭时，当事件处理程序是异步时，UWP不会结束调试

Question

当用户点击右上角的X关闭应用程序时，为什么我的UWP应用程序退出调试模式？

当控件上没有异步事件时，它会正常退出，但是一旦我将按钮的click事件更改为异步（FilePicker需要这个），应用程序就不会退出调试模式。< / p>

似乎有东西在某事上有参考，但我该如何调试呢？为什么只有在存在异步操作时才会发生这种情况？

代码：

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
    }

    private async void OnButtonPickSingleFileAsyncClicked(object sender, RoutedEventArgs e)
    {
        var picker = new Windows.Storage.Pickers.FileOpenPicker();
        picker.ViewMode = Windows.Storage.Pickers.PickerViewMode.List;
        picker.FileTypeFilter.Add("*");
        picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.ComputerFolder;

        var pickedFile = await picker.PickSingleFileAsync();
        if (pickedFile != null)
        {
            filePath.Text = pickedFile.Path;
        }
    }
}

XAML：

<Page
    x:Class="TestRepro.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:TestRepro"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Button Content="Pick File Async" HorizontalAlignment="Center" VerticalAlignment="Center" Click="OnButtonPickSingleFileAsyncClicked"/>
        <TextBlock Name="filePath" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Column="1"/>
    </Grid>
</Page>