How to get claim inside Asp.Net Core Razor View

Question

I did it in my rc1 project like:

User.Claims.ElementAt(#).Value

But after I switched to rtm it wouldn’t work anymore. When I debug the Razo

Answer 1

In Core 3.0, use view authorization

Startup.cs

    services.AddAuthorization(options =>
    {
        options.AddPolicy("Claim_Name", x => x.RequireClaim("Claim_Name"));
    });

Then inside the UI

    if ((AuthorizationService.AuthorizeAsync(User, "Claim_Name")).Result.Succeeded){
        //show ui element
    }

View-based authorization in ASP.NET Core MVC

Answer 2

Tested in .net core 2.2 in the razor page :

@User.FindFirst("nameOfClaim").Value

Answer 3

Assuming you have claims attached to the current principal. In your Razor view:

@((ClaimsIdentity) User.Identity)

This will give you access to the ClaimsIdentity of the current user. In an effort to keep your claims fetching clean you may want to create an extension method for searching claims.

public static string GetSpecificClaim(this ClaimsIdentity claimsIdentity, string claimType)
{
    var claim = claimsIdentity.Claims.FirstOrDefault(x => x.Type == claimType);

    return (claim != null) ? claim.Value : string.Empty;
}

Then you can just access whatever claim you want with:

@((ClaimsIdentity) User.Identity).GetSpecificClaim("someclaimtype")

Hope this helps.

Quick search for claims identity in razor view came up with a similar question and answer: MVC 5 Access Claims Identity User Data