public static async Task CreateAsync()

in WindowsDevicePortalWrapper/WindowsDevicePortalWrapper.Shared/Exceptions/DevicePortalException.cs [113:181]
58 lines of code
9 McCabe index (conditional complexity)

        public static async Task<DevicePortalException> CreateAsync(
            HttpResponseMessage responseMessage,
            string message = "",
            Exception innerException = null)
        {
            DevicePortalException error = new DevicePortalException(
                                                    responseMessage.StatusCode,
                                                    responseMessage.ReasonPhrase,
                                                    responseMessage.RequestMessage != null ? responseMessage.RequestMessage.RequestUri : null,
                                                    message,
                                                    innerException);
            try
            {
                if (responseMessage.Content != null)
                {
                    Stream dataStream = null;
#if !WINDOWS_UWP
                    using (HttpContent content = responseMessage.Content)
                    {
                        dataStream = new MemoryStream();

                        await content.CopyToAsync(dataStream).ConfigureAwait(false);

                        // Ensure we point the stream at the origin.
                        dataStream.Position = 0;
                    }
#else // WINDOWS_UWP
                    IBuffer dataBuffer = null;
                    using (IHttpContent messageContent = responseMessage.Content)
                    {
                        dataBuffer = await messageContent.ReadAsBufferAsync();

                        if (dataBuffer != null)
                        {
                            dataStream = dataBuffer.AsStream();
                        }
                    }
#endif  // WINDOWS_UWP

                    if (dataStream != null)
                    {
                        HttpErrorResponse errorResponse = DevicePortal.ReadJsonStream<HttpErrorResponse>(dataStream);

                        if (errorResponse != null)
                        {
                            error.HResult = errorResponse.ErrorCode;
                            error.Reason = errorResponse.ErrorMessage;

                            // If we didn't get the Hresult and reason from these properties, try the other ones.
                            if (error.HResult == 0)
                            {
                                error.HResult = errorResponse.Code;
                            }

                            if (string.IsNullOrEmpty(error.Reason))
                            {
                                error.Reason = errorResponse.Reason;
                            }
                        }
                    }
                }
            }
            catch (Exception)
            {
                // Do nothing if we fail to get additional error details from the response body.
            }

            return error;
        }