App.xaml.cs


#if WINDOWS
using Windows.Graphics;
#endif
namespace WeatherApp;

public partial class App : Application
{
    const int WindowWidth = 480;
    const int WindowHeight = 800;
    public App()
    {
        InitializeComponent();

        MainPage = new MainPage();

        Microsoft.Maui.Handlers.WindowHandler.Mapper.AppendToMapping(nameof(IWindow), (handler, view) =>
        {
            //设置界面宽高
#if WINDOWS
            var mauiWindow = handler.VirtualView;
            var nativeWindow = handler.PlatformView;
            nativeWindow.Activate();
            IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(nativeWindow);
            Microsoft.UI.WindowId windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(windowHandle);
            Microsoft.UI.Windowing.AppWindow appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(windowId);
            appWindow.Resize(new SizeInt32(WindowWidth, WindowHeight));
#endif

        });
    }
}