Accessing Claim Values in ASP.NET Core Razor Views: Retrieving and Utilizing User Claims in CSHTML Pages

To access claim values in a Razor view (.cshtml) page in ASP.NET Core, you can use the User property available in the view's ViewContext. Here's how you can do it:

1. In your Razor view file (.cshtml), you can access the claim values by using the User property available in the ViewContext object. Here's an example:

@using System.Security.Claims

@{
    var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
    var userName = User.FindFirstValue(ClaimTypes.Name);
}

<p>User ID: @userId</p>
<p>User Name: @userName</p>

In the above code, User.FindFirstValue(ClaimTypes.NameIdentifier) retrieves the user ID claim value, and User.FindFirstValue(ClaimTypes.Name) retrieves the username claim value. You can then use these values in your HTML markup as needed.

Make sure that you have set up authentication and claims properly in your ASP.NET Core application, as this code relies on the claims being present in the user's identity.

Note: It's recommended to handle null or empty values for claims to ensure a smooth user experience.