Question

I needed a class that would have everything TcpClient has + a couple extra fields so I created a class based on TcpClient:

public class MyClient: TcpClient
{
    public string winUser;
    public bool needHelp;
    public bool needSignOff;

    public MyClient() : base() {
        this.needHelp = false;
        this.needSignOff = false;
        this.winUser = "empty";
    }
}

Now I need all incoming connections to be created as objects of this class:

MyClient clientConnection = (MyClient)this.helpServer.AcceptTcpClient();

The problem is that AcceptTcpClient() generates a TcpClient class object and I keep getting this exception when I try to connect to server:

listenServer(): Unable to cast object of type ‘System.Net.Sockets.TcpClient’ to type ‘Server.MyClient’.

How do I convert a TcpClient object that AcceptTcpClient() gives me into MyClient object?

Answer 1

It’s not possible to downcast a type (TcpClient) to a more derived type (MyClient). You have to update AcceptTcpClient to return a MyClient object.