The type UserDBContext cannot be used as a type parameter ‘TContext’ in the generic type of method ‘AddApiAuthorization’

I’m trying to set up Authorization using Identity for my React ASP.NET Core app. I’m following the ASP.NET Core docs: Docs

In the previous examples I’m using my ‘UserDBContext’ wherever ‘ApplicationContext’ is referenced in the docs without trouble but in this particular instance I’m getting an error.

I’m running into an error when I try to configure the ‘AddIdentityServer’ service. In my Startup.cs

Full Error:

The type 'projectName.UserDBContext' cannot be used as type parameter 'TContext' in the generic type or method 'IdentityServerBuilderConfigurationExtensions.AddApiAuthorization<TUser, TContext>(IIdentityServerBuilder)'. There is no implicit reference conversion from 'projectName.UserDBContext' to 'IdentityServer4.EntityFramework.Interfaces.IPersistedGrantDbContext'

User.cs:

namespace project {

    public class User : IdentityUser {

        [DataType (DataType.Date)]
        public DateTime created { get; set; }

        [Key]
        [Required]
        public string email { get; set; }

        [Required]
        public string firstname { get; set; }

        [Required]
        public string lastname { get; set; }

        [Required]
        [Range (1, 100)]
        public string username { get; set; }

        [Required]
        [StringLength (100)]
        public string password { get; set; }

    }

    public class UserDBContext : IdentityDbContext {

        public DbSet<User> users { get; set; }

        public UserDBContext (DbContextOptions<UserDBContext> options) : base (options) { }

    }
}

Startup.cs

        public void ConfigureServices (IServiceCollection services) {

            services.AddControllersWithViews ();

            services.AddSpaStaticFiles (configuration => {
                configuration.RootPath = "ClientApp/build";
            });

            services.AddDbContext<UserDBContext> (options =>
                options.UseNpgsql (Configuration.GetConnectionString ("DefaultConnection")));

            services.AddDefaultIdentity<User> ()
                .AddEntityFrameworkStores<UserDBContext> ();

            services.AddIdentityServer()
                .AddApiAuthorization<User, UserDBContext>();


            services.AddAuthentication ()
                .AddIdentityServerJwt ();

        }

This is the code that is giving me the error:

            services.AddIdentityServer()
                .AddApiAuthorization<User, UserDBContext>();

Answers:

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Method 1

Try something like that:

public class UserDBContext : IdentityDbContext,IPersistedGrantDbContext {

    public DbSet<User> users { get; set; }

    public UserDBContext (DbContextOptions<UserDBContext> options) : base (options) { }

}

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