//服务器开始监听客户端的请求
            Connection.StartListening(ConnectionType.TCP, new IPEndPoint(IPAddress.Parse(txtIP.Text), int.Parse(txtPort.Text)));
            button1.Text = "监听中";
            button1.Enabled = false;

            //此方法中包含服务器具体的处理方法。
            StartListening();

  private void StartListening()
        {
            //开启日志记录
            //配置日志记录器
            //ILogger logger = new LiteLogger(LiteLogger.LogMode.ConsoleAndLogFile, "ServerLogFile_" + NetworkComms.NetworkIdentifier + ".txt");
            //NetworkComms.EnableLogging(logger);

            //禁用日志记录  服务器端正式使用时，赢禁用日志记录
            NetworkComms.DisableLogging();

            //服务器端处理收到的消息
            //为简单起见，此示例中我们只处理字符类型的信息，也返回字符类型的信息。
            //处理的信息可以使自定义类，具体见下一个Demo
            NetworkComms.AppendGlobalIncomingPacketHandler<LoginContract>("ReqLogin", IncomingLoginRequest);

        }

  //处理某个具体的请求
        private void IncomingLoginRequest(PacketHeader header, Connection connection, LoginContract loginContract)
        {
            try
            {
                string resMsg="";

                //为了简单，这里不调用数据库，而是模拟一下登录
                ")

                    resMsg = "登录成功";

                else

                    resMsg = "用户名密码错误";
                //把返回结果写入到契约类中，后面返回给客户端
                ResMsgContract contract = new ResMsgContract();
                contract.Message = resMsg;

                connection.SendObject<ResMsgContract>("ResLogin", contract);
            }
            catch (Exception ex)
            {
                LogTools.LogException(ex, "IncomingMsgHandle");
            }
        }

using System;
using System.Collections.Generic;
using System.Text;
using ProtoBuf;

namespace MessageContract
{ 

    [ProtoContract]
    public class LoginContract
    {
        [ProtoMember()]
        public string UserID { get; set; }

        [ProtoMember()]
        public string PassWord { get; set; }

        public LoginContract() { }

        public LoginContract(string userID, string passWord)
        {
            this.UserID = userID;
            this.PassWord = passWord;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using ProtoBuf; 

namespace MessageContract
{
    //操作结果的返回信息，可通用
    [ProtoContract]
    public class ResMsgContract
    {

        [ProtoMember()]
        public string Message;

        public ResMsgContract() { }

        public ResMsgContract(string message)
        {
            this.Message = message;
        }
    }
}

//连接信息对象
        public ConnectionInfo connInfo = null;
        //连接对象
        Connection newTcpConnection;

private void button1_Click(object sender, EventArgs e)
        {
            //给连接信息对象赋值
            connInfo = new ConnectionInfo(txtIP.Text, int.Parse(txtPort.Text));

            //如果不成功，会弹出异常信息
            newTcpConnection = TCPConnection.GetConnection(connInfo);

            button1.Enabled = false;
            button1.Text = "连接成功";
        }

 private void button2_Click(object sender, EventArgs e)
        {
            //给契约类赋值
            LoginContract contract = new LoginContract();
            contract.UserID = txtUserName.Text;
            contract.PassWord = txtPassword.Text;
            //向服务器发送登录信息并获取登录结果
            ResMsgContract resMsg = newTcpConnection.SendReceiveObject<LoginContract, ResMsgContract>(, contract);

            if (resMsg.Message == "登录成功")
            {
                MessageBox.Show("登录成功");

            }
            else
            {
                MessageBox.Show("用户名密码错误");
            }

        }