System.Net.Sockets.Socket.EndReceiveFrom C# (CSharp) Method

        public int EndReceiveFrom(IAsyncResult asyncResult, ref EndPoint endPoint)
        {
            if (NetEventSource.IsEnabled) NetEventSource.Enter(this, asyncResult);

            if (CleanedUp)
            {
                throw new ObjectDisposedException(this.GetType().FullName);
            }

            // Validate input parameters.
            if (endPoint == null)
            {
                throw new ArgumentNullException(nameof(endPoint));
            }
            if (!CanTryAddressFamily(endPoint.AddressFamily))
            {
                throw new ArgumentException(SR.Format(SR.net_InvalidEndPointAddressFamily, endPoint.AddressFamily, _addressFamily), nameof(endPoint));
            }
            if (asyncResult == null)
            {
                throw new ArgumentNullException(nameof(asyncResult));
            }

            OverlappedAsyncResult castedAsyncResult = asyncResult as OverlappedAsyncResult;
            if (castedAsyncResult == null || castedAsyncResult.AsyncObject != this)
            {
                throw new ArgumentException(SR.net_io_invalidasyncresult, nameof(asyncResult));
            }
            if (castedAsyncResult.EndCalled)
            {
                throw new InvalidOperationException(SR.Format(SR.net_io_invalidendcall, "EndReceiveFrom"));
            }

            Internals.SocketAddress socketAddressOriginal = SnapshotAndSerialize(ref endPoint);

            int bytesTransferred = castedAsyncResult.InternalWaitForCompletionInt32Result();
            castedAsyncResult.EndCalled = true;

            // Update socket address size.
            castedAsyncResult.SocketAddress.InternalSize = castedAsyncResult.GetSocketAddressSize();

            if (!socketAddressOriginal.Equals(castedAsyncResult.SocketAddress))
            {
                try
                {
                    endPoint = endPoint.Create(castedAsyncResult.SocketAddress);
                }
                catch
                {
                }
            }

            if (s_perfCountersEnabled)
            {
                if (bytesTransferred > 0)
                {
                    SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketBytesReceived, bytesTransferred);
                    if (Transport == TransportType.Udp)
                    {
                        SocketPerfCounter.Instance.Increment(SocketPerfCounterName.SocketDatagramsReceived);
                    }
                }
            }

            if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"bytesTransferred:{bytesTransferred}");

            // Throw an appropriate SocketException if the native call failed asynchronously.
            if ((SocketError)castedAsyncResult.ErrorCode != SocketError.Success)
            {
                // Update the internal state of this socket according to the error before throwing.
                SocketException socketException = new SocketException(castedAsyncResult.ErrorCode);
                UpdateStatusAfterSocketError(socketException);
                if (NetEventSource.IsEnabled) NetEventSource.Error(this, socketException);
                throw socketException;
            }
            if (NetEventSource.IsEnabled) NetEventSource.Exit(this, bytesTransferred);
            return bytesTransferred;
        }

        private void End(IAsyncResult Ar)
        {
            var error = SocketError.Success;

            try
            {
                m_Socket.EndReceiveFrom(Ar, ref m_ReceiveEndPoint);
            }
            catch (SocketException e)
            {
                error = e.SocketErrorCode;
            }
            catch (ObjectDisposedException ode)
            {
                return;
            }

            m_Message.SetError(error);
            m_Message.SetEndPoint(m_ReceiveEndPoint);
            lock (m_ReceivePackages)
            {
                m_ReceivePackages.Add(m_Message);
            }
            Begin();
        }