登录使用cookies记住密码

        UsersBLL bll = new UsersBLL();
        private void AutoLogin()
        {
            if (Request.Cookies["loginId"] != null && Request.Cookies["pwd"] != null && Request.Cookies["id"] != null)
            {
                int cookId = Convert.ToInt32(Request.Cookies["id"].Value);
                string cookLoginId = Request.Cookies["loginId"].Value;
                string cookPwd = Request.Cookies["pwd"].Value;
                UserInfo model = bll.GetUserById(cookId);
                if (model != null)
                {
                    string sysPwd = WebComm.MD5Str(model.LoginPwd, cookPwd.Substring(0, 2));
                    if (model.LoginId == cookLoginId && sysPwd == cookPwd)
                    {
                        GoPage(model);
                    }
                }
            }
        }

        protected void btLogin_Click(object sender, EventArgs e)
        {
            UserInfo model = bll.GetUser(txtUserLogin.Text.Trim(), WebComm.MD5Str(txtPwd.Text.Trim()));
            if (model == null)
            {
                JScript.Alert(this, "用户名或者密码错误！");
                return;
            }
            //用户勾选记住密码后执行
            if (checkPwd.Checked)
            {
                string dbcookPwd = WebComm.MD5Str(model.LoginPwd, null);
                HttpCookie cookId = new HttpCookie("id", model.Id.ToString());
                HttpCookie cookLoginId = new HttpCookie("loginId", model.LoginId);
                HttpCookie cookPwd = new HttpCookie("pwd", dbcookPwd);
                cookId.Expires = DateTime.Now.AddMonths(1);
                cookLoginId.Expires = DateTime.Now.AddMonths(1);
                cookPwd.Expires = DateTime.Now.AddMonths(1);
                Response.Cookies.Add(cookLoginId);
                Response.Cookies.Add(cookPwd);
                Response.Cookies.Add(cookId);
            }
            GoPage(model);
        }
        
        private void GoPage(UserInfo model)
        {
            Session["id"] = model.Id;
            Session["loginId"] = model.LoginId;
            Session["name"] = model.Name;
            string url = "~/Default.aspx";
            if (Request.QueryString["return"] != null)
            {
                url = Request.QueryString["return"];
            }
            Response.Redirect(url);
        }

应用到的方法

        #region MD5 加密字符串 +string MD5Str(string str)
        /// <summary>
        /// MD5 加密字符串
        /// </summary>
        /// <param name="rawPass">源字符串</param>
        /// <returns>加密后字符串</returns>
        public static string MD5Str(string str)
        {
            // 创建MD5类的默认实例：MD5CryptoServiceProvider
            MD5 md5 = MD5.Create();
            byte[] bs = Encoding.UTF8.GetBytes(str);
            byte[] hs = md5.ComputeHash(bs);
            StringBuilder sb = new StringBuilder();
            foreach (byte b in hs)
            {
                // 以十六进制格式格式化
                sb.Append(b.ToString("x2"));
            }
            return sb.ToString();
        }
        #endregion

        #region 返回 对字符串MD5之后 加上随机生成的盐值之后 再MD5 的字符串 +string MD5Str(string str, string salt)
        /// <summary>
        /// 返回 对字符串MD5之后 加上随机生成的盐值之后 再MD5 的字符串
        /// </summary>
        /// <param name="str"></param>
        /// <param name="salt">如果为null,则为字符串进行两次MD5加密算法</param>
        /// <returns></returns>
        public static string MD5Str(string str, string salt)
        {
            if (salt == null)
            {
                Random r = new Random();
                salt = ((char)r.Next(65, 91)).ToString() + ((char)r.Next(65, 91)).ToString();
            }
            return salt + MD5Str(salt + MD5Str(str));
        }
        #endregion

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