检查窗口是否在 UWP 中最小化

Question

I am developing a UWP application for Windows 10. I want to show a message dialog box when user reduces the size of the window. As of now, I have tried to implement the feature using this link . My purpose is being fulfilled here except the message dialog appears when user either minimizes the window or changes its size. I have also attached the code snippet below. Thank you.

private async void CoreWindow_SizeChanged(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.WindowSizeChangedEventArgs args)
        {
            var appView = ApplicationView.GetForCurrentView();
            MessageDialog messageDialog = new MessageDialog("");
            if (!appView.IsFullScreen)
            {
                if (!msgboxshown)
                {
                    messageDialog = new MessageDialog("To run the application smoothly, please maximize the window.");
                    msgboxshown = true;
                    await messageDialog.ShowAsync();
                    msgboxshown = false;
                }
            }
            args.Handled = true;
        }

Answer 1

My purpose is being fulfilled here except the message dialog appears when user either minimizes the window or changes its size.

When app minimizes, it will invoke EnteredBackground event, you could detect it and show your message dialog.

 public App() { this.InitializeComponent(); this.Suspending += OnSuspending; this.EnteredBackground += App_EnteredBackground; } private async void App_EnteredBackground(object sender, EnteredBackgroundEventArgs e) { var messageDialog = new MessageDialog("To run the application smoothly, please maximize the window."); await messageDialog.ShowAsync(); }

Update

As @Raymond Chen said, it looks os bug. So please use the above methods with caution.