How Can a Server Instantly Detect Client Socket Disconnections?

Detecting Client Disconnection from Server Socket Instantly

Problem:

When functioning as a server, how can we promptly determine when a client disconnects from the connected socket? The common methods for detecting client disconnection when connecting to a server are ineffective in this scenario.

Answer:

Socket connections do not natively provide disconnect events. Therefore, we must periodically check the socket's connection status. The following extension method offers a reliable way to detect if a socket has disconnected:

static class SocketExtensions
{
  public static bool IsConnected(this Socket socket)
  {
    try
    {
      return !(socket.Poll(1, SelectMode.SelectRead) && socket.Available == 0);
    }
    catch (SocketException) { return false; }
  }
}

This method polls the socket at a user-defined frequency to determine connectivity. If polling detects zero bytes available for reading from the socket, the connection is deemed disconnected.

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