Simplify User.IsInRole() check asp.net mvc

Question

In our asp.net mvc project in .cshtml views often you can find:

if (User.IsInRole("Admin") || User.IsInRole("Supervisor"))

I'd like to simplify current syntax like this: if (IsAdminOrSupervisor(User))

So, I need to make a html-helper, or some backend helper. Could you help me how can I do this? Thank you!

Answer 1

Create an extension to your identity for checking multiple roles:

public static bool IsAdminOrSupervisor(this IPrincipal user, List<string> roles)
{
    var userRoles = Roles.GetRolesForUser(user.Identity.Name);

    return userRoles.Any(u => roles.Contains(u));
}

Then you can use this like:

var roles = new List<string> { "Admin", "Supervisor" };

if (User.IsAdminOrSupervisor(roles))
{
   //Action
}

Tips: You need to reference the class that holds this method to your Razor:

@Using NameSpace.ClassName