How to update a claim in ASP.NET Identity?

Question

I'm using OWIN authentication for my MVC5 project. This is my `SignInAsync` ``` private async Task SignInAsync(ApplicationUser user, bool isPersistent) { var AccountNo = "101"; AuthenticationManager.SignOut(DefaultAuthenticationTypes.ExternalCookie); var identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie); identity.AddClaim(new Claim(ClaimTypes.UserData, AccountNo)); AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = isPersistent, RedirectUri="Account/Index"}, identity); } ``` As you can see, i added `AccountNo` into the Claims list. Now, how can I update this Claim at some point in my application? So far, i have this: ``` public string AccountNo { get { var CP = ClaimsPrincipal.Current.Identities.First(); var Account= CP.Claims.FirstOrDefault(p => p.Type == ClaimTypes.UserData); return Account.Value; } set { var CP = ClaimsPrincipal.Current.Identities.First(); var AccountNo= CP.Claims.FirstOrDefault(p => p.Typ…

Accepted Answer

I created a Extension method to Add/Update/Read Claims based on a given ClaimsIdentity

```
namespace Foobar.Common.Extensions
{
    public static class Extensions
    {
        public static void AddUpdateClaim(this IPrincipal currentPrincipal, string key, string value)
        {
            var identity = currentPrincipal.Identity as ClaimsIdentity;
            if (identity == null)
                return;

// check for existing claim and remove it
            var existingClaim = identity.FindFirst(key);
            if (existingClaim != null)
                identity.RemoveClaim(existingClaim);

// add new claim
            identity.AddClaim(new Claim(key, value));
            var authenticationManager = HttpContext.Current.GetOwinContext().Authentication;
            authenticationManager.AuthenticationResponseGrant = new AuthenticationResponseGrant(new ClaimsPrincipal(identity), new AuthenticationProperties() { IsPersistent = true });
        }

public static string GetClaimValue(this IPrincipal currentPrincipal, string key)
        {
            var identity = currentPrincipal.Identity as ClaimsIdentity;
            if (identity == null)
                return null;

var claim = identity.Claims.FirstOrDefault(c => c.Type == key);

// ?. prevents a exception if claim is null.
            return claim?.Value;
        }
    }
}
```

and then to use it

```
using Foobar.Common.Extensions;

namespace Foobar.Web.Main.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            // add/updating claims
            User.AddUpdateClaim("key1", "value1");
            User.AddUpdateClaim("key2", "value2");
            User.AddUpdateClaim("key3", "value3");
        }

public ActionResult Details()
        {
            // reading a claim
            var key2 = User.GetClaimValue("key2");          
        }
    }
}
```

How to update a claim in ASP.NET Identity?

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