我想用C#写个局域网聊天的程序，来这里求些学习资料。

Question

我想做成像QQ 聊天那样的程序，但对C#网络编程还不太懂，哪位朋友能提一些建议或提供一些学习资料？谢谢了！

Answer 1

带加密的Chat
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
using System.IO;
using System.Security.Cryptography;namespace Chat
{
    class ChatApp
    {
        private static IPAddress rempteIPAddress;
        private static int remotePort;
        private static int localPort;
        private static UTF8Encoding Utf8Encod = new UTF8Encoding();
        private static string CryptoKey = "!~6oxli@]t2K'yd$";
        private static string CryptoIV = "!~6oxli@]t2K'yd$";        static void Main(string[] args)
        {
            try
            {
                //Get necessary data for connection
                //Console.WriteLine("Enter Local Port");
                //localPort = Convert.ToInt16(Console.ReadLine());
                localPort = 10001;                //Console.WriteLine("Enter Remote Port");
                //remotePort = Convert.ToInt16(Console.ReadLine());
                remotePort = 10005;
                
                //Console.WriteLine("Enter Remote IP Address");
                //rempteIPAddress = IPAddress.Parse(Console.ReadLine());                rempteIPAddress = IPAddress.Parse("127.0.0.1");
                //Create thread for listening
                Thread tRec = new Thread(new ThreadStart(Receive));
                tRec.Start();                //byte[] bytes = encryptData("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
                //Console.WriteLine("-----"+bytes.Length.ToString());
                //bytes = null;
                //bytes = UTF8Encoding.ASCII.GetBytes("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
                //Console.WriteLine("======" + bytes.Length.ToString());                //Console.ReadLine();
                while (true)
                {
                    Send(Console.ReadLine());
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }        private static void Send(string datagram)
        { 
            //Create UdpClient
            UdpClient sender = new UdpClient();
            
            //Create IPEndPoint with details of remote host
            IPEndPoint endPoint = new IPEndPoint(rempteIPAddress, remotePort);            try
            {
                //byte[] bytes = encryptData(datagram);                byte[] bytes = Encoding.ASCII.GetBytes(datagram);
                sender.Send(bytes, bytes.Length, endPoint);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            finally 
            {
                sender.Close();
            }
        }        private static void Receive()
        {
            //Create a UdpClient for reading incoming data.
            UdpClient receivingUdpClient = new UdpClient(localPort);
            IPEndPoint RemoteIpEndPoint = null;
            try
            {
                Console.WriteLine("------------------Ready for chat!!!------------------");
                while (true)
                { 
                    //wait for datagram
                    byte[] receiveBytes = receivingUdpClient.Receive(ref RemoteIpEndPoint);
                    //Convert and display data
                    string returnData = Encoding.ASCII.GetString(receiveBytes);
                    Console.WriteLine("-"+returnData.ToString());
                    //returnData = decryptData(receiveBytes);
                    Console.WriteLine("-"+returnData.ToString());
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }        static byte[] encryptData(string theDataGram)
        {
            byte[] bCipherText = null;
            try
            {
                //Create the Rijndael Service Provider object and assign the key and vector to it
                RijndaelManaged RijndaelProvider = new RijndaelManaged();
                //Console.WriteLine(RijndaelProvider.BlockSize.ToString() +"/"+ RijndaelProvider.Key.Length + "/" + RijndaelProvider.IV.Length);                //Console.WriteLine(UTF8Encoding.ASCII.GetBytes(CryptoIV).Length.ToString());
                RijndaelProvider.Key = Utf8Encod.GetBytes(CryptoKey);
                //Utf8Encod = new UTF8Encoding();
                RijndaelProvider.IV = Utf8Encod.GetBytes(CryptoIV);                ICryptoTransform RijndaelEncrypt = RijndaelProvider.CreateEncryptor();
                byte[] bClearText = Utf8Encod.GetBytes(theDataGram);
                MemoryStream Mstm = new MemoryStream();
                //Create Crypto Stram that transforms a stream using the encryption
                CryptoStream Cstm = new CryptoStream(Mstm, RijndaelEncrypt, CryptoStreamMode.Write);                //Write out encrypted content into MemoryStream
                Cstm.Write(bClearText, 0, bClearText.Length);
                Cstm.FlushFinalBlock();                //Get the output
                bCipherText = Mstm.ToArray();
                Cstm.Close();
                Mstm.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            return bCipherText;
        }        static string decryptData(byte[] bCipherText)
        {
            string sEncoded = "";
            try
            {
                //Create the RijndaelManaged Service Provider object and assign the key and vector to it
                RijndaelManaged RijndaelProvider = new RijndaelManaged();
                RijndaelProvider.Key = Utf8Encod.GetBytes(CryptoKey);
                RijndaelProvider.IV = Utf8Encod.GetBytes(CryptoIV);                ICryptoTransform RijndaelDecrypt = RijndaelProvider.CreateDecryptor();
                MemoryStream Mstm = new MemoryStream(bCipherText, 0, bCipherText.Length);
                //Create Crypto Stram that transforms a stream using the encryption
                CryptoStream Cstm = new CryptoStream(Mstm, RijndaelDecrypt, CryptoStreamMode.Read);                //Read out the result from the Crypto Stream
                StreamReader Sr = new StreamReader(Cstm);
                sEncoded = Sr.ReadToEnd();                Sr.Close();
                Cstm.Close();
                Mstm.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            return sEncoded;
        }
    }
}

Answer 2

三种方案
1.dot net remoting;
2.web severce
3.socket