C#中C/S登录界面 代码

以下是一个简单的 C# C/S 登录界面代码，你可以参考一下：

客户端：

using System;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;

namespace Client
{
    public partial class LoginForm : Form
    {
        private TcpClient client;
        private NetworkStream stream;

        public LoginForm()
        {
            InitializeComponent();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            try
            {
                client = new TcpClient();
                client.Connect("127.0.0.1", 8888); // 连接服务器
                stream = client.GetStream();

                string username = txtUsername.Text.Trim();
                string password = txtPassword.Text.Trim();
                string loginInfo = "login " + username + " " + password;

                byte[] buffer = Encoding.UTF8.GetBytes(loginInfo);
                stream.Write(buffer, 0, buffer.Length);

                buffer = new byte[1024];
                int len = stream.Read(buffer, 0, buffer.Length);
                string result = Encoding.UTF8.GetString(buffer, 0, len);

                if (result == "success")
                {
                    MessageBox.Show("登录成功");
                }
                else
                {
                    MessageBox.Show("用户名或密码错误");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                stream?.Close();
                client?.Close();
            }
        }
    }
}

服务器端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace Server
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpListener listener = new TcpListener(IPAddress.Any, 8888);
            listener.Start();

            Console.WriteLine("服务器已启动");

            while (true)
            {
                TcpClient client = listener.AcceptTcpClient();
                Console.WriteLine("客户端已连接");

                NetworkStream stream = client.GetStream();

                byte[] buffer = new byte[1024];
                int len = stream.Read(buffer, 0, buffer.Length);
                string loginInfo = Encoding.UTF8.GetString(buffer, 0, len);

                string[] info = loginInfo.Split(' ');
                string username = info[1];
                string password = info[2];

                if (username == "admin" && password == "123456")
                {
                    buffer = Encoding.UTF8.GetBytes("success");
                    stream.Write(buffer, 0, buffer.Length);
                }
                else
                {
                    buffer = Encoding.UTF8.GetBytes("fail");
                    stream.Write(buffer, 0, buffer.Length);
                }

                stream.Close();
                client.Close();
            }
        }
    }
}

注：为了简化代码，此示例中没有进行任何的安全验证，请勿在实际项目中使用。