CSharpGL.Win32.wglGetCurrentDC C# (CSharp) Метод

        internal static extern IntPtr wglGetCurrentDC();

        // TODO: 此函数的'try to remove unused items from rc2ProcDict'部分尚需检测。
        /// <summary>
        /// 设置Debug模式的回调函数。
        /// <para>此函数的'try to remove unused items from rc2ProcDict'部分尚需检测。</para>
        /// </summary>
        /// <param name="callback"></param>
        /// <param name="userParam">建议使用<see cref="UnmanagedArray.Header"/></param>
        public static void DebugMessageCallback(DebugProc callback, IntPtr userParam)
        {
            if (innerCallbackProc == null)
            {
                innerCallbackProc = new DEBUGPROC(innerCallback);
            }

            IntPtr renderContext = Win32.wglGetCurrentContext();
            IntPtr deviceContext = Win32.wglGetCurrentDC();

            if (rc2ProcDict.ContainsKey(renderContext))
            {
                rc2ProcDict[renderContext] = callback;
                rc2dcDict[renderContext]   = deviceContext;
            }
            else
            {
                rc2ProcDict.Add(renderContext, callback);
                rc2dcDict.Add(renderContext, deviceContext);
                debugProcDictCount++;
                // try to remove unused items from rc2ProcDict
                if (debugProcDictCount > maxDebugProcDictCount)
                {
                    List <IntPtr> unusedRCList = new List <IntPtr>();
                    foreach (var item in rc2dcDict)
                    {
                        if (!Win32.wglMakeCurrent(item.Value, item.Key))// 这种检测方式可行吗？
                        {
                            unusedRCList.Add(item.Key);
                        }
                    }
                    foreach (var item in unusedRCList)
                    {
                        rc2ProcDict.Remove(item);
                        rc2dcDict.Remove(item);
                    }

                    debugProcDictCount -= unusedRCList.Count;

                    maxDebugProcDictCount = debugProcDictCount + 100;

                    Win32.wglMakeCurrent(renderContext, deviceContext);
                }
            }

            GetDelegateFor <glDebugMessageCallback>()(innerCallbackProc, userParam);
        }