使用DialogService 弹窗时，丢失Active 状态的问题

在WPF中使用Prism框架提供的DialogService弹窗时（尤其时在弹窗中再次弹窗时），在最上层弹窗关闭时引起激活主窗体或其他打开的程序，导致弹窗或主窗体被新弹出的窗体遮挡。

问题是由弹窗Ower丢失引起的问题。

 

解决方案为在 DialogWindow的 ’ Closing  ‘ 和 ’ Closed ‘ 事件中设置 Owner?.Activate();

 

参考代码

 public class DialogWindow : Window, IDialogWindow
    {
        public DialogWindow() : this(0) { }

        public DialogWindow(int captionHeight)
        {
            ShowInTaskbar = false;
            WindowStartupLocation = WindowStartupLocation.CenterOwner;
            Owner = Application.Current.MainWindow;
            WindowState = WindowState.Normal;
            SizeToContent = SizeToContent.WidthAndHeight;
            WindowStyle = WindowStyle.None;
            AllowsTransparency = true;
            ResizeMode = ResizeMode.NoResize;
            Background = Brushes.Transparent;
            WindowChrome.SetWindowChrome(this, new WindowChrome
            {
                CaptionHeight = captionHeight,
                ResizeBorderThickness = new Thickness(1),
                CornerRadius = new CornerRadius(6),
                GlassFrameThickness = new Thickness(0),
                UseAeroCaptionButtons = false,
                NonClientFrameEdges = NonClientFrameEdges.None
            });
            Closing += DialogWindow_Closing;
            Closed += DialogWindow_Closed;
        }


        private void DialogWindow_Closing(object sender, EventArgs e) => Owner?.Activate();

        private void DialogWindow_Closed(object sender, EventArgs e)
        {
            Closing -= DialogWindow_Closing;
            Closed -= DialogWindow_Closed;
        }

        public IDialogResult Result { get; set; }
    }
}