int port = 2000;      //指定端口 （最后些在配置文件中）
String host = "127.0.0.1";   //指定IP
IPAddress ip = IPAddress.Parse(host);//把ip地址字符串转换为IPAddress类型的实例
IPEndPoint ipep = new IPEndPoint(ip, port);//用指定的端口和ip初始化IPEndPoint类的新实例

int recv;//用于表示客户端发送的信息长度
byte[]data=new byte[1024];//用于缓存客户端所发送的信息,通过socket传递的信息必须为字节数组
//IPEndPoint ipep=new IPEndPoint(IPAddress.Any,9050);//本机预使用的IP和端口(本人进行测试没有通过)
Socket newsock=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

newsock.Bind(ipep);//绑定
newsock.Listen(10);//监听
Console.WriteLine("waiting for a client");
Socket client=newsock.Accept();//当有可用的客户端连接尝试时执行，并返回一个新的socket,用于与客户端之间的通信
IPEndPoint clientip=(IPEndPoint)client.RemoteEndPoint;
Console.WriteLine("connect with client:"+clientip.Address+"atport:"+clientip.Port);
string welcome="welcome here!";
data=Encoding.ASCII.GetBytes(welcome);
client.Send(data,data.Length,SocketFlags.None);//发送信息
while(true)
{//用死循环来不断的从客户端获取信息
　　data=new byte[1024];
　　recv=client.Receive(data);
　　Console.WriteLine("recv="+recv);
　　if(recv==0)//当信息长度为0，说明客户端连接断开
　　　　break;
　　Console.WriteLine(Encoding.ASCII.GetString(data,0,recv));
　　client.Send(data,recv,SocketFlags.None);
}
Console.WriteLine("Disconnected from"+clientip.Address);
client.Close();
newsock.Close();

byte[] data = new byte[1024];
Socket newclient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
Console.Write("please input the server ip:");
string ipadd = Console.ReadLine();
Console.WriteLine();
Console.Write("please input the server port:");
int port = Convert.ToInt32(Console.ReadLine());
IPEndPoint ie = new IPEndPoint(IPAddress.Parse(ipadd), port);//服务器的IP和端口
try
{
    //因为客户端只是用来向特定的服务器发送信息，所以不需要绑定本机的IP和端口。不需要监听。
    newclient.Connect(ie);
}
catch (SocketException e)
{
    Console.WriteLine("unable to connect to server");
    Console.WriteLine(e.ToString());
    return;
}
int recv = newclient.Receive(data);
string stringdata = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine(stringdata);
while (true)
{
    string input = Console.ReadLine();
    if (input == "exit")
        break;
    newclient.Send(Encoding.ASCII.GetBytes(input));
    data = new byte[1024];
    recv = newclient.Receive(data);
    stringdata = Encoding.ASCII.GetString(data, 0, recv);
    Console.WriteLine(stringdata);
}
Console.WriteLine("disconnect from sercer");
newclient.Shutdown(SocketShutdown.Both);
newclient.Close();