asp.net下使用Cookie保存登录信息

在网页中登录窗口是最常见的，如果把登录信息存在客户机Cookie中，下次用户登录时，网页先在客户机上查找登录信息，如果成功即可跳过登录步骤直接到主窗口，如登录界面如下：

 

实现：

１、第一次登录时保存到Cookie中,我使用的是ActionResult:

 public ActionResult Login(User user)
        {
            if (string.IsNullOrEmpty(user.Name) || string.IsNullOrEmpty(user.Pwd))
            {
                return Content("no:请输入完整，不能为空！");
            }
            User dbuser = dao.GetUserByName(user);

            if (dbuser == null)
            {
                return Content("no:用户名错误！");
            }
            if (dbuser.Pwd != user.Pwd)
            {
                return Content("no:密码错误！");
            }
            var record = Request["ckbrecord"].ToBoolean();
            SetCookie(record,user);
            Session["userinfo"] = dbuser;
            return Content("ok:"+dbuser.Rank);
        }

 //设置cookie;
       private void SetCookie(bool record, User user)
        {
            if (record)
            {
                HttpCookie cookiename = new HttpCookie("printName", DES.MD5Encrypt(HttpUtility.UrlEncode(user.Name)));
                cookiename.Expires = DateTime.MaxValue;
                Response.Cookies.Add(cookiename);
                HttpCookie cookiepwd = new HttpCookie("printPwd", DES.MD5Encrypt(HttpUtility.UrlEncode(user.Pwd)));
                cookiepwd.Expires = DateTime.MaxValue;
                Response.Cookies.Add(cookiepwd);
            }
            else
            {
                HttpCookie cookiepwd = Request.Cookies["printPwd"];
                if (cookiepwd != null)
                {
                    cookiepwd.Expires = DateTime.Now.AddHours(-1);
                    Response.Cookies.Add(cookiepwd);
                }
            }
        }

2、登录界面前检查Cookie，把下面判断放在首页Action中

//cookie登录
        private User CookieLogin()
        {
            HttpCookie printName = Request.Cookies["printName"];
            HttpCookie printPwd = Request.Cookies["printPwd"];

            User user = new User();
            if (printName != null && printPwd != null)
            {
                user.Name =HttpUtility.UrlDecode(DES.MD5Decrypt(printName.Value));
                user.Pwd = HttpUtility.UrlDecode(DES.MD5Decrypt(printPwd.Value));
            }
            return user;
        }

 HttpUtility.UrlDecode和HttpUtility.UrlEncode是处理中文乱码问题用的。