C#基于.net的登录与注册功能代码

好的，下面是基于.NET的C#登录与注册功能的代码示例：

1. 用户实体类

public class User
{
    public int Id { get; set; }
    public string UserName { get; set; }
    public string Password { get; set; }
    public string Email { get; set; }
}

2. 数据库操作类

public class UserRepository
{
    private string connectionString = "your connection string here";
    
    public bool CreateUser(User user)
    {
        using (var connection = new SqlConnection(connectionString))
        {
            var command = new SqlCommand("INSERT INTO Users (UserName, Password, Email) VALUES (@UserName, @Password, @Email)", connection);
            command.Parameters.AddWithValue("@UserName", user.UserName);
            command.Parameters.AddWithValue("@Password", user.Password);
            command.Parameters.AddWithValue("@Email", user.Email);
            connection.Open();
            return command.ExecuteNonQuery() > 0;
        }
    }
    
    public User GetUser(string userName)
    {
        using (var connection = new SqlConnection(connectionString))
        {
            var command = new SqlCommand("SELECT * FROM Users WHERE UserName = @UserName", connection);
            command.Parameters.AddWithValue("@UserName", userName);
            connection.Open();
            var reader = command.ExecuteReader();
            if (reader.HasRows)
            {
                reader.Read();
                return new User
                {
                    Id = (int)reader["Id"],
                    UserName = reader["UserName"].ToString(),
                    Password = reader["Password"].ToString(),
                    Email = reader["Email"].ToString()
                };
            }
            else
            {
                return null;
            }
        }
    }
}

3. 登录控制器

public class LoginController : Controller
{
    private UserRepository userRepository = new UserRepository();
    
    public ActionResult Index()
    {
        return View();
    }
    
    [HttpPost]
    public ActionResult Index(string userName, string password)
    {
        var user = userRepository.GetUser(userName);
        if (user != null && user.Password == password)
        {
            Session["UserId"] = user.Id;
            Session["UserName"] = user.UserName;
            return RedirectToAction("Index", "Home");
        }
        else
        {
            ViewBag.Message = "用户名或密码错误！";
            return View();
        }
    }
}

4. 注册控制器

public class RegisterController : Controller
{
    private UserRepository userRepository = new UserRepository();
    
    public ActionResult Index()
    {
        return View();
    }
    
    [HttpPost]
    public ActionResult Index(User user)
    {
        if (ModelState.IsValid)
        {
            if (userRepository.CreateUser(user))
            {
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ViewBag.Message = "注册失败！";
                return View();
            }
        }
        else
        {
            ViewBag.Message = "输入有误！";
            return View();
        }
    }
}

以上是基于.NET的C#登录与注册功能的代码示例，仅供参考。需要注意的是，在实际应用中，我们需要对用户输入进行严格的验证和过滤，以防止 SQL 注入等攻击。