如何在 c# windows 10 UWP 中圆角 App main window？

Question

问题：圆角 C# windows 10 UWP 应用程序主 window。

限制条件：我使用的是windows sdk版本windows version 2004 10.0 Build 19041.

听说切换到windows11 sdk版本

会自动圆角

我在 App.xaml.cs 中尝试了以下方法。Ref

逻辑如下

获取mainwindow的window句柄，传给windows api圆角

  sealed partial class App : Application
{
    [ComImport, Guid("45D64A29-A63E-4CB6-B498-5781D298CB4F")]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface ICoreWindowInterop
    {
        IntPtr WindowHandle { get; }
        bool MessageHandled { set; }
    }
    public enum DWMWINDOWATTRIBUTE
    {
        DWMWA_WINDOW_CORNER_PREFERENCE = 33
    }

    // The DWM_WINDOW_CORNER_PREFERENCE enum for DwmSetWindowAttribute's third parameter, which tells the function
    // what value of the enum to set.
    public enum DWM_WINDOW_CORNER_PREFERENCE
    {
        DWMWCP_DEFAULT = 0,
        DWMWCP_DONOTROUND = 1,
        DWMWCP_ROUND = 2,
        DWMWCP_ROUNDSMALL = 3
    }

    // Import dwmapi.dll and define DwmSetWindowAttribute in C# corresponding to the native function.
    [DllImport("dwmapi.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern long DwmSetWindowAttribute(IntPtr hwnd,
                                                     DWMWINDOWATTRIBUTE attribute,
                                                     ref DWM_WINDOW_CORNER_PREFERENCE pvAttribute,
                                                     uint cbAttribute);
    /// <summary>
    /// Initializes the singleton application object.  This is the first line of authored code
    /// executed, and as such is the logical equivalent of main() or WinMain().
    /// </summary>
    public  App()
    {
        this.InitializeComponent();
     
   
        dynamic corewin = Windows.UI.Core.CoreWindow.GetForCurrentThread();
        var interop = (ICoreWindowInterop)corewin;
        var handle = interop.WindowHandle;

        var attribute = DWMWINDOWATTRIBUTE.DWMWA_WINDOW_CORNER_PREFERENCE;
        var preference = DWM_WINDOW_CORNER_PREFERENCE.DWMWCP_ROUND;
        DwmSetWindowAttribute(handle, attribute, ref preference, sizeof(uint));
    
        this.Suspending += OnSuspending;
    }

但 window 句柄在构造函数代码中为空。当我在 onlaunched 事件中尝试此代码时，window 处理 returns 值并且代码成功执行。但是圆角效果不是available.Let我知道有没有解决办法

Answer 1

How to round corner of App main window in c# windows 10 UWP?

恐怕没有api可以为uwp设置应用程序的主要window圆角，它是由系统管理的，没有提供api设置手动。

从您提到的代码中派生，您可以获得 window 的 hwnd，但是没有采用 HWND 的受支持 API。对于 DwmSetWindowAttribute，请参阅其文档最低支持的客户端 Windows Vista [仅限桌面应用]，但不包括 UWP 平台。