ASP.NET Core MVC (.NET Framework) writing, reading and updating cookies

Question

I am using cookies in one of my ASP.NET Core MVC (.NET Framework) applications. I am trying to keep an object value while the client browser session is alive. I want to read, write and update that value.

I order to serialize and deserialize my object I use the JavascriptSerializer class from System.Web.Script.Serialization namespace and in order to handle the cookie I am using the HttpResponse and HttpRequest classes from the Microsoft.ASPNetCore.Http namespace.

I can read the cookie then deserialize it to my object or Serialize my object then write it to the cookie. But I cannot update the cookie because of the Response.Cookies object not allowing me to update an existing cookie. Then I deleted the cookie and append it to the Response.Cookies object, that worked but. Is there any other way of updating a cookie within an MVC6 application without having to deleted it?. That is not "cookie updating"!!

Chris F Carroll · Accepted Answer · 2019-05-15 10:26:50Z

6

Cookies cannot be updated. Nor, for that matter can they be deleted. This is not an issue with MVC, it's a fact about cookies, see e.g. https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies : the only operation the server can do on a cookie is to set it. Perhaps it is helpful to think of the cookie as owned by the browser not the server.

To update a cookie, you overwrite it with a new value.
To delete a cookie, you set the expiration to yesterday.

in the browser you can see that re-appending a new value for the cookie has the effect you want: the browser gets the new value. e.g.

serverside:

HttpContext.Response.Cookies.Append("key", "value set at " + DateTime.Now.TimeOfDay);

and client side:

document.writeln(document.cookie);
console.log("document.cookie", document.cookie);

edited May 15, 2019 at 10:26

answered Apr 6, 2017 at 20:49

Chris F Carroll

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1 Comment

baywet Over a year ago

you now also have a delete method on HttpContext.Response.Cookies which makes deleting cookies easier

Nemi Chand · Accepted Answer · 2017-08-23 11:51:12Z

-1

Try this: CookieManager Wrapper (https://github.com/nemi-chand/CookieManager) .

it helps you to read/write/update the http cookie in asp.net core. it has fluent API's to ease of use

answered Aug 23, 2017 at 11:51

Nemi Chand

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