Asp.NETPersonnalBlogSystem/BLL/UserService.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Asp.NETPersonnalBlogSystem.DAL;
using Asp.NETPersonnalBlogSystem.Models;

namespace Asp.NETPersonnalBlogSystem.BLL
{
    /// <summary>
    /// 用户业务逻辑类
    /// 处理用户相关的业务操作
    /// </summary>
    public class UserService
    {
        /// <summary>
        /// 用户登录验证
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <param name="password">密码</param>
        /// <returns>验证成功返回用户对象，否则返回null</returns>
        public User Login(string userName, string password)
        {
            using (var db = new BlogDbContext())
            {
                var user = db.Users.FirstOrDefault(u => u.UserName == userName);
                if (user == null)
                {
                    return null;
                }

                if (user.Status != 1)
                {
                    return null;
                }

                if (!SecurityHelper.VerifyPassword(password, user.Salt, user.Password))
                {
                    return null;
                }

                user.LastLoginTime = DateTime.Now;
                db.SaveChanges();

                return user;
            }
        }

        /// <summary>
        /// 用户注册
        /// </summary>
        /// <param name="userName">用户名</param>
        /// <param name="password">密码</param>
        /// <param name="email">邮箱</param>
        /// <param name="nickName">昵称</param>
        /// <returns>注册成功返回用户对象，否则返回null</returns>
        public User Register(string userName, string password, string email, string nickName)
        {
            using (var db = new BlogDbContext())
            {
                if (db.Users.Any(u => u.UserName == userName))