Using Cookie in Asp.Net Mvc 4

问题:

I have web application in Asp.Net MVC4 and I want to use cookie for user's login and logout. So my actions as follows:

Login Action

    [HttpPost]
    public ActionResult Login(string username, string pass)
    {
        if (ModelState.IsValid)
        {
            var newUser = _userRepository.GetUserByNameAndPassword(username, pass);
            if (newUser != null)
            {
                var json = JsonConvert.SerializeObject(newUser);

                var userCookie = new HttpCookie("user", json);
                userCookie.Expires.AddDays(365);
                HttpContext.Response.Cookies.Add(userCookie);

                return RedirectToActionPermanent("Index");
            }
        }
        return View("UserLog");
    }

LogOut Action

    public ActionResult UserOut()
    {
        if (Request.Cookies["user"] != null)
        {
            var user = new HttpCookie("user")
                {
                    Expires = DateTime.Now.AddDays(-1),
                    Value = null
                };
            Response.Cookies.Add(user);
        }
        return RedirectToActionPermanent("UserLog");
    }

And I use this cookie in _Loyout as follow:

@using EShop.Core
@using Newtonsoft.Json
@{
   var userInCookie = Request.Cookies["user"];
}
...
  @if (userInCookie != null && userInCookie.Value)
  {
        <li><a href="#">Salam</a></li>
        <li><a href="@Url.Action("UserOut", "Home")">Cıxış</a></li>
  }
  else
  {
        <li><a href="@Url.Action("UserLog", "Home")">Giriş</a></li>
  }

But When I click *UserOut* action this action happen first time, but then it doesn't work. I put breakpoint for looking process but it get UserLog action doesn't UserOut. My question is that where I use wrong way of cookie? What is a best way using cookie in Asp.Net Mvc4 for this scenario ?

回答1:

Try using Response.SetCookie(), because Response.Cookies.Add() can cause multiple cookies to be added, whereas SetCookie will update an existing cookie.

回答2:

We are using Response.SetCookie() for update the old one cookies and Response.Cookies.Add() are use to add the new cookies. Here below code CompanyId is update in old cookie[OldCookieName].

HttpCookie cookie = Request.Cookies["OldCookieName"];//Get the existing cookie by cookie name.
cookie.Values["CompanyID"] = Convert.ToString(CompanyId);
Response.SetCookie(cookie); //SetCookie() is used for update the cookie.
Response.Cookies.Add(cookie); //The Cookie.Add() used for Add the cookie.

回答3:

userCookie.Expires.AddDays(365); 

This line of code doesn't do anything. It is the equivalent of:

DateTime temp = userCookie.Expires.AddDays(365); 
//do nothing with temp

You probably want

userCookie.Expires = DateTime.Now.AddDays(365);