System.Net.HttpListenerRequest.SetClientCertificateError C# (CSharp) Method

        internal void SetClientCertificateError(int clientCertificateError)
        {
            _clientCertificateError = clientCertificateError;
        }

        private static unsafe void IOCompleted(ListenerClientCertAsyncResult asyncResult, uint errorCode, uint numBytes)
        {
            HttpListenerRequest httpListenerRequest = (HttpListenerRequest)asyncResult.AsyncObject;
            object result = null;

            try
            {
                if (errorCode == Interop.HttpApi.ERROR_MORE_DATA)
                {
                    //There is a bug that has existed in http.sys since w2k3.  Bytesreceived will only
                    //return the size of the inital cert structure.  To get the full size,
                    //we need to add the certificate encoding size as well.

                    Interop.HttpApi.HTTP_SSL_CLIENT_CERT_INFO *pClientCertInfo = asyncResult.RequestBlob;
                    asyncResult.Reset(numBytes + pClientCertInfo->CertEncodedSize);

                    uint bytesReceived = 0;
                    errorCode =
                        Interop.HttpApi.HttpReceiveClientCertificate(
                            httpListenerRequest.HttpListenerContext.RequestQueueHandle,
                            httpListenerRequest._connectionId,
                            (uint)Interop.HttpApi.HTTP_FLAGS.NONE,
                            asyncResult._memoryBlob,
                            asyncResult._size,
                            &bytesReceived,
                            asyncResult._pOverlapped);

                    if (errorCode == Interop.HttpApi.ERROR_IO_PENDING ||
                        (errorCode == Interop.HttpApi.ERROR_SUCCESS && !HttpListener.SkipIOCPCallbackOnSuccess))
                    {
                        return;
                    }
                }

                if (errorCode != Interop.HttpApi.ERROR_SUCCESS)
                {
                    asyncResult.ErrorCode = (int)errorCode;
                    result = new HttpListenerException((int)errorCode);
                }
                else
                {
                    Interop.HttpApi.HTTP_SSL_CLIENT_CERT_INFO *pClientCertInfo = asyncResult._memoryBlob;
                    if (pClientCertInfo != null)
                    {
                        if (NetEventSource.IsEnabled)
                        {
                            NetEventSource.Info(null,
                                                $"pClientCertInfo:{(IntPtr)pClientCertInfo} pClientCertInfo->CertFlags: {pClientCertInfo->CertFlags} pClientCertInfo->CertEncodedSize: {pClientCertInfo->CertEncodedSize} pClientCertInfo->pCertEncoded: {(IntPtr)pClientCertInfo->pCertEncoded} pClientCertInfo->Token: {(IntPtr)pClientCertInfo->Token} pClientCertInfo->CertDeniedByMapper: {pClientCertInfo->CertDeniedByMapper}");
                        }
                        if (pClientCertInfo->pCertEncoded != null)
                        {
                            try
                            {
                                byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
                                Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length);
                                result = httpListenerRequest.ClientCertificate = new X509Certificate2(certEncoded);
                            }
                            catch (CryptographicException exception)
                            {
                                if (NetEventSource.IsEnabled)
                                {
                                    NetEventSource.Info(null,
                                                        $"HttpListenerRequest: {httpListenerRequest} caught CryptographicException: {exception}");
                                }
                                result = exception;
                            }
                            catch (SecurityException exception)
                            {
                                if (NetEventSource.IsEnabled)
                                {
                                    NetEventSource.Info(null, $"HttpListenerRequest: {httpListenerRequest} caught SecurityException: {exception}");
                                }
                                result = exception;
                            }
                        }
                        httpListenerRequest.SetClientCertificateError((int)pClientCertInfo->CertFlags);
                    }
                }

                // complete the async IO and invoke the callback
                if (NetEventSource.IsEnabled)
                {
                    NetEventSource.Info(null, "Calling Complete()");
                }
            }
            catch (Exception exception) when(!ExceptionCheck.IsFatal(exception))
            {
                result = exception;
            }
            finally
            {
                if (errorCode != Interop.HttpApi.ERROR_IO_PENDING)
                {
                    httpListenerRequest.ClientCertState = ListenerClientCertState.Completed;
                }
            }

            asyncResult.InvokeCallback(result);
        }