Store does not implement IUserRoleStore<TUser> ASP.NET Core Identity

In Startup.cs, I was missing AddRoles so

services.AddDefaultIdentity<PortalUser>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

should be

services.AddDefaultIdentity<PortalUser>()
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

Note: The order is critical. AddRoles must come before AddEntityFrameworkStores

For there are not any answers about the solution in asp.net Core 2.2, I would like to share the same error I meet in asp.net Core 2.2

First, here is another solution for the same error in asp.net core 2.1 https://github.com/aspnet/AspNetCore.Docs/issues/8683

And thanks to the author's idea, I meet the problem when I follow the official guidance in asp.net core 2.2 (the url is in here : MicrosoftDocs For asp.net core 2.2). When I finish the step he says and try to run the project, it throws a exception "Store does not implement IUserRoleStore"

and the problem is : actually, this is the sample for asp.net core 2.1 (And I strongly doubt that why the Microsoft will provide users a docs with not any sample codes, which can't make sense probably)

And you will find that, in Areas/Identity/Data/IdentityHostingStartup.cs IdentityHostingStartup::Configure method you have the following codes :

services.AddDefaultIdentity<IdentityUser>().AddEntityFrameworkStores<ApplicationDbContext>();

which is same as the code you should add in /Program.cs ConfigureService as the step : Add Role services to Identity in docs mentioned :

services.AddDefaultIdentity<IdentityUser>().AddRoles<IdentityRole>().AddEntityFrameworkStores<ApplicationDbContext>();

so if you meet the same problem in asp.net core 2.2, an alternative solution is :

1. Following the docs in asp.net 2.2
2. When you meet this Chapter : Add Role services to Identity , just ignore the official docs and do it :

replace the row

services.AddDefaultIdentity<IdentityUser>().AddEntityFrameworkStores<ApplicationDbContext>();

with

services.AddDefaultIdentity<IdentityUser>().AddRoles<IdentityRole>().AddEntityFrameworkStores<ApplicationDbContext>();

in Areas/Identity/Data/IdentityHostingStartup.cs IdentityHostingStartup::Configure method, but not add it in program.cs (the file can't be deleted in asp.net core 2.2)

The project I use Asp.net Identity will be updated later in my repos : UWPHelper , Good Luck :)