[WPF] 在 Windows 11 中处理 WindowChrome 的圆角

using System.Runtime.InteropServices;
using System.Windows.Interop;

public partial class MainWindow : Window
{

    public MainWindow()
    {
        InitializeComponent();

        IntPtr hWnd = new WindowInteropHelper(GetWindow(this)).EnsureHandle();
        var attribute = DWMWINDOWATTRIBUTE.DWMWA_WINDOW_CORNER_PREFERENCE;
        var preference = DWM_WINDOW_CORNER_PREFERENCE.DWMWCP_ROUND;
        DwmSetWindowAttribute(hWnd, attribute, ref preference, sizeof(uint));

        // ...
        // Perform any other work necessary
        // ...
    }


    // The enum flag for DwmSetWindowAttribute's second parameter, which tells the function what attribute to 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)]
    private static extern long DwmSetWindowAttribute(IntPtr hwnd,
                                                     DWMWINDOWATTRIBUTE attribute,
                                                     ref DWM_WINDOW_CORNER_PREFERENCE pvAttribute,
                                                     uint cbAttribute);

    // ...
    // Various other definitions
    // ...
}