Using cookie in asp.net mvc c#

Question

I want to register the parameter of a few pages in my web site using cookie. I tried the below code but not like what I want :

 public ActionResult Index(int? dep, int? cat)
 {
   ......
   string theDept = Request.QueryString["dep"];
   HttpCookie cookie = new HttpCookie("search");
   cookie.Values["dep_name"] = theDept;
   cookie.Expires = DateTime.Now.AddDays(1);
   Response.Cookies.Add(cookie);
   return View();
 }

I read it in site.master :

<% 

HttpCookie cookie = Request.Cookies["search"] ;

if ((cookie != null) && (cookie.Value != ""))
{
    Response.Write(cookie.Values["dep_name"].ToString() + "---" +   
    cookie.Values["cat_name"].ToString() + "---" + cookie.Values["brand"].ToString());
}
%>

Problem: When I click to another page that Request.QueryString["dep"] is null, the cookie that I display is null to.

How to store it in the cookie without losing while we not yet clear the cookie?

DeepSpace101 · Accepted Answer · 2013-01-13 20:07:08Z

74

I m not sure I understand if this is a question about how to properly send cookies to the client or some bug with your querystring params. So I ll post the proper way of sending cookies and feel free to correct me if I misunderstood.

In any case though, I believe this:

HttpCookie cookie = new HttpCookie("search");

will reset the search cookie

To get a cookie:

HttpCookie cookie = HttpContext.Request.Cookies.Get("some_cookie_name");

To check for a cookie's existence:

HttpContext.Request.Cookies["some_cookie_name"] != null

To save a cookie:

HttpCookie cookie = new HttpCookie("some_cookie_name");
HttpContext.Response.Cookies.Remove("some_cookie_name");
HttpContext.Response.SetCookie(cookie );

edited Jan 13, 2013 at 20:07

DeepSpace101

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answered Feb 8, 2012 at 22:48

Yannis

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3 Comments

MrBoJangles Over a year ago

I've been doing web stuff for nearly six years and I was given a task involving setting a cookie for the first time just recently. Weird, wild stuff. This helps, thanks!

Felipe Correa Over a year ago

To clarify, where would you put this code inside the MVC project to avoid filling up your controllers with trash?

Jaylen Over a year ago

doesn't the line HttpContext.Response.Cookies.Remove removes the cookie not saving it?

Brian Low · Accepted Answer · 2014-01-31 18:35:19Z

18

i have organised the cookie fetching and inserting in an organized manner such that it can be used throughout the application. for that purpose i put two methods SetCookie and GetCookie.

You can simply put this class in your code and work out.

Here i put my class with the static methods

public class CookieStore
{
    public static void SetCookie(string key, string value, TimeSpan expires)
    {
        HttpCookie encodedCookie = HttpSecureCookie.Encode(new HttpCookie(key, value));

        if (HttpContext.Current.Request.Cookies[key] != null)
        {
            var cookieOld = HttpContext.Current.Request.Cookies[key];
            cookieOld.Expires = DateTime.Now.Add(expires);
            cookieOld.Value = encodedCookie.Value;
            HttpContext.Current.Response.Cookies.Add(cookieOld);
        }
        else
        {
            encodedCookie.Expires = DateTime.Now.Add(expires);
            HttpContext.Current.Response.Cookies.Add(encodedCookie);
        }
     }
    public static string GetCookie(string key)
    {
        string value = string.Empty;
        HttpCookie cookie = HttpContext.Current.Request.Cookies[key];

        if (cookie != null)
        {
            // For security purpose, we need to encrypt the value.
            HttpCookie decodedCookie = HttpSecureCookie.Decode(cookie);
            value = decodedCookie.Value;
        }
        return value;
    }

}

using these you can easily store values in cookie and fetch value whenever required

using these methods is as simple as

For Setting Cookie:

CookieStore.SetCookie("currency", "GBP", TimeSpan.FromDays(1)); // here 1 is no of days for cookie to live

For Getting Cookie:

string currency= CookieStore.GetCookie("currency");

edited Jan 31, 2014 at 18:35

Brian Low

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answered Jan 31, 2014 at 11:18

Shiva Saurabh

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6 Comments

Brian Low Over a year ago

When saving, why update the existing cookie instead of setting a new one?

Shiva Saurabh Over a year ago

i got an issue that i find the cookie twice when seen in quick watch one with expiry date as jan 1 0001, so thought to update it.

Brian Low Over a year ago

Are you using HttpSecureCookie from nuget.org/packages/httpsecurecookie ?

Shiva Saurabh Over a year ago

no its a customized class which i have used with machine key cryptography. you can perform cookie saving without encoding and decoding here.

Clarence Over a year ago

Could not find HttpSecureCookie. That's not kind business to those new to using this because they will waste time looking for it when it doesn't exist. Please make sure that is plain to the users. Don't assume everyone's coming in with full knowledge of the libraries

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