殺害コード.cs

KillWPF.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    async void MyVoidAsync1()
    {
        await Task.Delay(TimeSpan.FromSeconds(1)).ConfigureAwait(false);
        MyVoidAsync2();
    }

    async void MyVoidAsync2()
    {
        await Task.FromResult(0);
        throw new Exception("ウィンドウごとしぬ");
    }

    private async void button_Click(object sender, RoutedEventArgs e)
    {
        MyVoidAsync1();
    }
}