Windows 10 Universal app screen size on launch not

问题:

I had read a ton about setting the app window size on launch. Basically, my app is launching full screen everytime. I want to restrict it to a pre-defined size when it launches. However, nothing seems to be working. Here is what I have done so far:

1. I have put the following:

   var desiredSize = new Size(400, 600);
   ApplicationView.GetForCurrentView().ExitFullScreenMode();
   ApplicationView.GetForCurrentView().SetPreferredMinSize(desiredSize);
   ApplicationView.PreferredLaunchViewSize = desiredSize;
   ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;
   

And have tried that snippet in first the constructor for MainPage.xaml.cs (which didn't work), then just above

Window.Current.Activate();     

In App.xaml.cs which also didn't work. Based on some reading, I also tried adding:

ApplicationView.GetForCurrentView().TryResizeView(desiredSize);

Both after Window.Current.Activate in App.xaml.cs and at the end of the constructor in MainPage.xaml.cs.

I did notice that in MainPage.xaml.cs, I could do:

 this.Width = 400;
 this.Height = 600;

And that does work to size the MainPage frame within the window properly but the overall Window stays the same size.

I can manually drag the window to the size I want after it launches but I want it so simply just launch this size everytime. What am I missing?

Thanks!

回答1:

You should set minimum window size if it's less than default

            ApplicationView.GetForCurrentView().SetPreferredMinSize(new Size { Width = 400, Height = 600});
            ApplicationView.PreferredLaunchViewSize = new Size(400, 600);
            ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;

Call this in App.xaml.cs before Window.Current.Activate();