public void StartReceive()
{
if (!_isReceiveStart)
{
_isReceiveStart = true;
ReadStateObject state = new ReadStateObject();
state.workSocket = _socket;
state.Source = this;
_socket.BeginReceive(state.buffer, 0, ReadStateObject.BufferSize, SocketFlags.None,
new AsyncCallback(ReadCallback), state);
}
}
public static void ReadCallback(IAsyncResult ar)
{
// Retrieve the state object and the handler socket
// from the asynchronous state object.
ReadStateObject state = (ReadStateObject)ar.AsyncState;
Socket handler = state.workSocket;
try
{
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
// handle FIN
if (bytesRead == 0)
{
state.Source.Shutdown();
return;
}
if (bytesRead > 0)
{
// raise event
state.Source.SocketReceiveEvent?.Invoke(state.Source, new SocketReceiveEventArgs(state.buffer.Take(bytesRead).ToArray()));
}
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, ReadStateObject.BufferSize, SocketFlags.None,
new AsyncCallback(ReadCallback), state);
}
catch (SocketException ex)
{
// disconnection detected
switch ((SocketError)ex.ErrorCode)
{
case SocketError.ConnectionReset:
state.Source.Shutdown();
break;
default:
state.Source.Shutdown();
break;
}
}
catch (ObjectDisposedException) { } // the socket has been disposed.
}