Multiple Identities in ASP.NET Core 2.0

Question

I am migrating an ASP.NET Core 1.0 application to ASP.NET Core 2.0.

In my startup I am configuring two identities:

services.AddIdentity

        

Answer 1

Asp.net Core 2.2 provides a built-in method for that purpose.

AddIdentityCore

How to use it:

services.AddIdentity(configureIdentity)
   .AddDefaultTokenProviders()
   .AddUserStore>()
   .AddRoleStore>();

services.AddIdentityCore(configureIdentity)
   .AddDefaultTokenProviders()
   .AddErrorDescriber()
   .AddUserStore>()
   .AddRoleStore>();

services.AddScoped>();

In fact, read the implementation of this method from asp.net core 2.2 github repo

    /// 

    /// Adds and configures the identity system for the specified User type. Role services are not added by default 
    /// but can be added with .
    /// 
    /// The type representing a User in the system.
    /// The services available in the application.
    /// An action to configure the .
    /// An  for creating and configuring the identity system.
    public static IdentityBuilder AddIdentityCore(this IServiceCollection services, Action setupAction)
        where TUser : class
    {
        // Services identity depends on
        services.AddOptions().AddLogging();

        // Services used by identity
        services.TryAddScoped, UserValidator>();
        services.TryAddScoped, PasswordValidator>();
        services.TryAddScoped, PasswordHasher>();
        services.TryAddScoped();
        services.TryAddScoped, DefaultUserConfirmation>();
        // No interface for the error describer so we can add errors without rev'ing the interface
        services.TryAddScoped();
        services.TryAddScoped, UserClaimsPrincipalFactory>();
        services.TryAddScoped>();

        if (setupAction != null)
        {
            services.Configure(setupAction);
        }

        return new IdentityBuilder(typeof(TUser), services);
    }