System.Net.Http.WinHttpException.ConvertErrorCodeToHR C# (CSharp) Метод

        public static int ConvertErrorCodeToHR(int error)
        {
            // This method allows common error detection code to be used by consumers
            // of HttpClient. This method converts the ErrorCode returned by WinHTTP
            // to the same HRESULT value as is provided in the .Net Native implementation
            // of HttpClient under the same error conditions. Clients would access
            // HttpRequestException.InnerException.HRESULT to discover what caused
            // the exception.
            switch ((uint)error)
            {
                case Interop.WinHttp.ERROR_WINHTTP_CONNECTION_ERROR:
                    return unchecked((int)Interop.WinHttp.WININET_E_CONNECTION_RESET);
                default:
                    // Marshal.GetHRForLastWin32Error can't be used as not all error codes originate from native
                    // code.
                    return Interop.HRESULT_FROM_WIN32(error);
            }
        }