How do I Maximize the Windows Screen in a .NET MAUI App

Question

I want my .NET Maui app to run as a Mazimized window. How do I accomplish this?

I tried using this code but it wants a DLLImport code?

 Microsoft.Maui.Handlers.WindowHandler.Mapper.AppendToMapping(nameof(IWindow), (handler, view) =>
        {
#if WINDOWS
            var nativeWindow = handler.PlatformView;
            nativeWindow.Activate();
            IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(nativeWindow);
            ShowWindow(windowHandle, 3);
#endif
        });

      
    }
#if WINDOWS
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(IntPtr hWnd, int cmdShow);
#endif

Answer 1

Hello,

For the full-screen requirement of the Windows platform, you can refer to the following code.

#if WINDOWS
using Microsoft.UI;
using Microsoft.UI.Windowing;
#endif



// Add this method for builder.
.ConfigureLifecycleEvents(events =>
{
#if WINDOWS
    events.AddWindows(w =>
    {
        w.OnWindowCreated(window =>
        {
            window.ExtendsContentIntoTitleBar = true; //If you need to completely hide the minimized maximized close button, you need to set this value to false.
            IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
            WindowId myWndId = Win32Interop.GetWindowIdFromWindow(hWnd);
            var _appWindow = AppWindow.GetFromWindowId(myWndId);
            _appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);
        });
    });
#endif
});

Best Regards,

Alec Liu.

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