我自己做的一段程序

我用多线程的一简单的登录程序，与大家一起分享一下，献丑了

server端的代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Data;
using System.Data.SqlClient;

namespace server
{
    class Program
    {
        static void Main(string[] args)
        {
            tcpserver info = new tcpserver();
        }
    }
    class tcpserver
    {
        private Socket server;
        public tcpserver()
        {
            IPAddress local = IPAddress.Parse("127.0.0.1");
            IPEndPoint iep = new IPEndPoint(local, 13000);
            server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            server.Bind(iep);
            server.Listen(20);
            Console.Write("----------------等待连接---------------");
            while (true)
            {
                Socket client = server.Accept();
                clientthred newclient = new clientthred(client);
                Thread newthread = new Thread(new ThreadStart(newclient.clientservice));
                newthread.Start();
            }
        }
    }
    class clientthred
    {
        public Socket service;
        int i;
       
        public clientthred(Socket clientsocket)
        {
            this.service = clientsocket;
        }
        public void clientservice()
        {
            string data;
            byte[] bytes = new byte[024];
            string back;
            Console.WriteLine('/n'+"------------------连接成功---------------");
            while ((i = service.Receive(bytes)) != 0)
            {
                data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
                Console.WriteLine('/n' + "收到数据{0}", data);

                Data conn = new Data();
                DataTableReader ws = conn.datas(data);

                if (ws.HasRows)
                {
                    Console.WriteLine("----------------------------");
                    while (ws.Read())
                    {
                        Console.WriteLine("用户登录的密码是：{0}", ws[0]);
                        back = ws[0].ToString().Trim();
                        byte[] msg = System.Text.Encoding.ASCII.GetBytes(back);
                        service.Send(msg);
                        Console.WriteLine("发送数据{0}",back);

                    }
                }
                else
                {
                    Console.WriteLine("no");
                    back ="no";
                    byte[] qw = System.Text.Encoding.ASCII.GetBytes(back);
                    service.Send(qw);
                    Console.WriteLine("发送数据{0}", back);
                }

               
            }
         
        }
    }
}
数据处理的类：

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

 

namespace server
{
    class Data
    {
        public DataTableReader datas(string username)
        {
            string connstring = "data source=.; initial catalog= jssk;user id=sa";
            using (SqlConnection conn = new SqlConnection(connstring))
            {
                try
                {
                    conn.Open();
                    DataSet ds = new DataSet();
                    SqlDataAdapter daor = new SqlDataAdapter("select passwd from userinfo where username='" + username + "'", conn);
                    daor.Fill(ds, "info");
                    DataTableReader dtr = ds.CreateDataReader();
                    return dtr;
                }
                catch (SqlException e)
                {

                    Console.WriteLine(e.Message);
                    return null;
                }
            }

        }
    }
}
客户端的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int i;
            Socket client;
            byte[] buf = new byte[1024];
            IPAddress local = IPAddress.Parse("127.0.0.1");
            IPEndPoint iep = new IPEndPoint(local, 13000);
            try
            {
                client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                client.Connect(iep);
            }
            catch(SocketException)
            {
                MessageBox.Show("无法连接到服务器");
                return;
            }

            string name = textBox1.Text.ToString().Trim();
            string passwd = textBox2.Text.ToString().Trim();
            string message = name;
            client.Send(Encoding.ASCII.GetBytes(name));
            if ((i = client.Receive(buf)) != 0)
            {
                string back = System.Text.Encoding.ASCII.GetString(buf, 0, i);
                if (back == "no")
                {
                    MessageBox.Show("密码错误");

                }
                else
                {
                    int w = string.Compare(back, textBox2.Text.ToString().Trim());
                    if (w == 0)
                    {
                        Form2 qw = new Form2();
                        qw.Show();
                    }
                    else if (w != 0)
                    {
                        MessageBox.Show("密码错误");
                    }
                }

            }
          
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}