.net代码实现一个用户注册和登录后用户管理的综合实例

以下是一个简单的 .NET 用户注册、登录和管理的综合示例代码。

1. 创建一个名为 "User" 的类，该类具有以下属性：

public class User
{
    public int Id { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public string Email { get; set; }
    public string FullName { get; set; }
    public bool IsActive { get; set; }
}

2. 创建一个名为 "UserManager" 的类，该类将处理用户的创建、读取、更新和删除操作：

public class UserManager
{
    private readonly string _connectionString;

    public UserManager(string connectionString)
    {
        _connectionString = connectionString;
    }

    public User CreateUser(User user)
    {
        using (var connection = new SqlConnection(_connectionString))
        {
            var command = new SqlCommand("INSERT INTO Users (Username, Password, Email, FullName, IsActive) VALUES (@Username, @Password, @Email, @FullName, @IsActive); SELECT SCOPE_IDENTITY()", connection);
            command.Parameters.AddWithValue("Username", user.Username);
            command.Parameters.AddWithValue("Password", user.Password);
            command.Parameters.AddWithValue("Email", user.Email);
            command.Parameters.AddWithValue("FullName", user.FullName);
            command.Parameters.AddWithValue("IsActive", user.IsActive);

            connection.Open();
            user.Id = Convert.ToInt32(command.ExecuteScalar());
        }

        return user;
    }

    public User GetUserById(int userId)
    {
        var user = new User();

        using (var connection = new SqlConnection(_connectionString))
        {
            var command = new SqlCommand("SELECT * FROM Users WHERE Id = @Id", connection);
            command.Parameters.AddWithValue("Id", userId);

            connection.Open();
            var reader = command.ExecuteReader();

            if (reader.Read())
            {
                user.Id = (int)reader["Id"];
                user.Username = (string)reader["Username"];
                user.Password = (string)reader["Password"];
                user.Email = (string)reader["Email"];
                user.FullName = (string)reader["FullName"];
                user.IsActive = (bool)reader["IsActive"];
            }
        }

        return user;
    }

    public void UpdateUser(User user)
    {
        using (var connection = new SqlConnection(_connectionString))
        {
            var command = new SqlCommand("UPDATE Users SET Username = @Username, Password = @Password, Email = @Email, FullName = @FullName, IsActive = @IsActive WHERE Id = @Id", connection);
            command.Parameters.AddWithValue("Username", user.Username);
            command.Parameters.AddWithValue("Password", user.Password);
            command.Parameters.AddWithValue("Email", user.Email);
            command.Parameters.AddWithValue("FullName", user.FullName);
            command.Parameters.AddWithValue("IsActive", user.IsActive);
            command.Parameters.AddWithValue("Id", user.Id);

            connection.Open();
            command.ExecuteNonQuery();
        }
    }

    public void DeleteUser(int userId)
    {
        using (var connection = new SqlConnection(_connectionString))
        {
            var command = new SqlCommand("DELETE FROM Users WHERE Id = @Id", connection);
            command.Parameters.AddWithValue("Id", userId);

            connection.Open();
            command.ExecuteNonQuery();
        }
    }
}

3. 创建一个名为 "AuthenticationManager" 的类，该类将处理用户身份验证相关的操作：

public class AuthenticationManager
{
    private readonly UserManager _userManager;

    public AuthenticationManager(UserManager userManager)
    {
        _userManager = userManager;
    }

    public bool ValidateUser(string username, string password)
    {
        var user = _userManager.GetUserByUsername(username);

        if (user == null)
        {
            return false;
        }

        return string.Equals(user.Password, password);
    }
}

4. 在 Web 应用程序中，使用 ASP.NET Identity 实现用户注册和登录：

// 注册新用户
var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
    await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
    return RedirectToAction("Index", "Home");
}
AddErrors(result);

// 登录
var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
switch (result)
{
    case SignInStatus.Success:
        return RedirectToLocal(returnUrl);
    case SignInStatus.LockedOut:
        return View("Lockout");
    case SignInStatus.RequiresVerification:
        return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
    case SignInStatus.Failure:
    default:
        ModelState.AddModelError("", "Invalid login attempt.");
        return View(model);
}

5. 在 Web 应用程序中，使用 ASP.NET Identity 实现用户管理：

// 获取当前用户
var user = await UserManager.FindByIdAsync(User.Identity.GetUserId());

// 更新用户
user.Email = model.Email;
user.FullName = model.FullName;
user.IsActive = model.IsActive;
var result = await UserManager.UpdateAsync(user);

if (result.Succeeded)
{
    return RedirectToAction("Index");
}
AddErrors(result);

// 删除用户
var result = await UserManager.DeleteAsync(user);
if (result.Succeeded)
{
    AuthenticationManager.SignOut(DefaultAuthenticationTypes.ApplicationCookie);
    return RedirectToAction("Index", "Home");
}
AddErrors(result);

这是一个简单的示例，您可以根据自己的需求进行更改和扩展。