C# UDP Socket client and server

Question

My first question here. I am new to this kind of programming, and i\'ve only programmed .NET web sites and forms.

Now, the company I work at, asks me to make an Acti

Answer 1

Simple server and client:

public struct Received
{
    public IPEndPoint Sender;
    public string Message;
}

abstract class UdpBase
{
    protected UdpClient Client;

    protected UdpBase()
    {
        Client = new UdpClient();
    }

    public async Task Receive()
    {
        var result = await Client.ReceiveAsync();
        return new Received()
        {
            Message = Encoding.ASCII.GetString(result.Buffer, 0, result.Buffer.Length),
            Sender = result.RemoteEndPoint
        };
    }
}

//Server
class UdpListener : UdpBase
{
    private IPEndPoint _listenOn;

    public UdpListener() : this(new IPEndPoint(IPAddress.Any,32123))
    {
    }

    public UdpListener(IPEndPoint endpoint)
    {
        _listenOn = endpoint;
        Client = new UdpClient(_listenOn);
    }

    public void Reply(string message,IPEndPoint endpoint)
    {
        var datagram = Encoding.ASCII.GetBytes(message);
        Client.Send(datagram, datagram.Length,endpoint);
    }

}

//Client
class UdpUser : UdpBase
{
    private UdpUser(){}

    public static UdpUser ConnectTo(string hostname, int port)
    {
        var connection = new UdpUser();
        connection.Client.Connect(hostname, port);
        return connection;
    }

    public void Send(string message)
    {
        var datagram = Encoding.ASCII.GetBytes(message);
        Client.Send(datagram, datagram.Length);
    }

}

class Program 
{
    static void Main(string[] args)
    {
        //create a new server
        var server = new UdpListener();

        //start listening for messages and copy the messages back to the client
        Task.Factory.StartNew(async () => {
            while (true)
            {
                var received = await server.Receive();
                server.Reply("copy " + received.Message, received.Sender);
                if (received.Message == "quit")
                    break;
            }
        });

        //create a new client
        var client = UdpUser.ConnectTo("127.0.0.1", 32123);

        //wait for reply messages from server and send them to console 
        Task.Factory.StartNew(async () => {
            while (true)
            {
                try
                {
                    var received = await client.Receive();
                    Console.WriteLine(received.Message);
                    if (received.Message.Contains("quit"))
                        break;
                }
                catch (Exception ex)
                {
                    Debug.Write(ex);
                }
            }
        });

        //type ahead :-)
        string read;
        do
        {
            read = Console.ReadLine();
            client.Send(read);
        } while (read != "quit");
    }
}