Authorization issue when use [Authorize] attribute in page in client blazor app

Question

When i use

@attribute [Authorize]

on a razor page in blazor Client app it give me this error

System.InvalidOperationException: Cannot provide a value for property 'AuthorizationPolicyProvider' on type 'Microsoft.AspNetCore.Components.PageDisplay+AuthorizeViewWithSuppliedData'. There is no registered service of type 'Microsoft.AspNetCore.Authorization.IAuthorizationPolicyProvider'

I set the authentication and use custom AuthenticationStateProvider for the client side as following

 public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<AuthenticationStateProvider, ApiAuthenticationStateProvider>();
            services.AddSingleton<AuthService, AuthService>();
            services.AddBlazoredLocalStorage();

        }

        public void Configure(IComponentsApplicationBuilder app)
        {
            app.AddComponent<App>("app");
        }
    }

any help with this issue

Answer 1

i just needed to add services.AddAuthorizationCore();

thanks for KodiakMx

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddBlazoredLocalStorage();
        services.AddAuthorizationCore();
        services.AddScoped<AuthenticationStateProvider, ApiAuthenticationStateProvider>();
    }

Answer 2

You may need to add app.UseAuthentication(); to your Configure method in Startup class.

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
        app.UseHsts();
    }

    app.UseHttpsRedirection();
    app.UseStaticFiles();
    app.UseCookiePolicy();

    app.UseAuthentication();
    app.UseSession();
    app.UseMvc(routes =>
    {
        routes.MapRoute(
           name: "default",
           template: "{controller=Home}/{action=Index}/{id?}");
    });
}