NativeMethods.cs

using System.Runtime.InteropServices;

namespace AreaDesignWpfControls
{
    public class NativeMethods
    {
        #region Native Definitions
        public enum DwmWindowAttribute : uint
        {
            DWMWA_NCRENDERING_ENABLED = 1,
            DWMWA_NCRENDERING_POLICY,
            DWMWA_TRANSITIONS_FORCEDISABLED,
            DWMWA_ALLOW_NCPAINT,
            DWMWA_CAPTION_BUTTON_BOUNDS,
            DWMWA_NONCLIENT_RTL_LAYOUT,
            DWMWA_FORCE_ICONIC_REPRESENTATION,
            DWMWA_FLIP3D_POLICY,
            DWMWA_EXTENDED_FRAME_BOUNDS,
            DWMWA_HAS_ICONIC_BITMAP,
            DWMWA_DISALLOW_PEEK,
            DWMWA_EXCLUDED_FROM_PEEK,
            DWMWA_CLOAK,
            DWMWA_CLOAKED,
            DWMWA_FREEZE_REPRESENTATION,
            DWMWA_PASSIVE_UPDATE_MODE,
            DWMWA_USE_HOSTBACKDROPBRUSH,
            DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
            DWMWA_WINDOW_CORNER_PREFERENCE = 33,
            DWMWA_BORDER_COLOR,
            DWMWA_CAPTION_COLOR,
            DWMWA_TEXT_COLOR,
            DWMWA_VISIBLE_FRAME_BORDER_THICKNESS,
            DWMWA_LAST
        };

        [DllImport("dwmapi.dll")]
        private static extern int DwmSetWindowAttribute(IntPtr hwnd, int dwAttribute, ref int pvAttribute, int cbAttribute);

        [StructLayout(LayoutKind.Sequential)]
        private struct RTL_OSVERSIONINFOEX
        {
            internal uint dwOSVersionInfoSize;
            internal uint dwMajorVersion;
            internal uint dwMinorVersion;
            internal uint dwBuildNumber;
            internal uint dwPlatformId;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            internal string szCSDVersion;
        }

        [DllImport("ntdll")]
        private static extern int RtlGetVersion(ref RTL_OSVERSIONINFOEX lpVersionInformation);

        public static Version RtlGetOSVersion()
        {
            RTL_OSVERSIONINFOEX v = new ()
            {
                dwOSVersionInfoSize = (uint)Marshal.SizeOf<RTL_OSVERSIONINFOEX>()
            };
            if (RtlGetVersion(ref v) == 0)
            {
                return new Version((int)v.dwMajorVersion, (int)v.dwMinorVersion, (int)v.dwBuildNumber);
            }
            else
            {
                throw new Exception("RtlGetVersion failed!");
            }
        }
        #endregion

        /// <summary>
        /// 为窗口标题栏切换深色模式
        /// </summary>
        /// <param name="hwnd">窗口句柄</param>
        /// <param name="darkTheme">为 true 表示使用深色模式</param>
        /// <returns>执行成功返回 true</returns>
        public static bool SetWindowFrameTheme(IntPtr hwnd, bool darkTheme)
        {
            if (RtlGetOSVersion().Build > 22000)
            {
                var darkMode = darkTheme ? 1 : 0;
                int result = DwmSetWindowAttribute(hwnd, (int)DwmWindowAttribute.DWMWA_USE_IMMERSIVE_DARK_MODE, ref darkMode, sizeof(int));
                return result == 0;
            }
            return false;
        }
    }
}