How do I add support for and populate roles in Razor Pages?

Question

I'm trying to figure out how to enable and populate roles in my Razor Pages application.

By following various tutorials, ConfigureServices in Startup.cs looks like this:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(
            Configuration.GetConnectionString("DefaultConnection")));

    services.AddDefaultIdentity<ApplicationUser>(options =>
        {
            options.SignIn.RequireConfirmedAccount = false;
        })
        .AddRoles<ApplicationUser>()
        .AddEntityFrameworkStores<ApplicationDbContext>();

    services.AddRazorPages();

    // Set the default authentication policy to require users to be authenticated
    services.AddControllers(config =>
    {
        var policy = new AuthorizationPolicyBuilder()
            .RequireAuthenticatedUser()
            .Build();
        config.Filters.Add(new AuthorizeFilter(policy));
    });
}

But the call to AddDefaultIdentity raises an exception.

System.InvalidOperationException: 'AddEntityFrameworkStores can only be called with a role that derives from IdentityRole.'

Can anyone see what I'm missing here? Also, I really want to know how to populate the roles.

Answer 1

Change your IdentityUser to IdentityRole like below:

services.AddDefaultIdentity<ApplicationUser>(options =>
        {
            options.SignIn.RequireConfirmedAccount = false;
        })
        .AddRoles<IdentityRole>()  //change this
        .AddEntityFrameworkStores<ApplicationDbContext>();

Reference:

https://learn.microsoft.com/en-us/aspnet/core/security/authorization/roles?view=aspnetcore-3.1#add-role-services-to-identity