Unable to resolve service for type 'Microsoft.AspNetCore.Identity.UserManager` while attempting to activate 'AuthController'

Question

I\'m getting this error in Login Controller.

InvalidOperationException: Unable to resolve service for type \'Microsoft.AspNetCore.Identity.UserManager

Answer 1

This is a bit unrelated to the original post but since Google brings you here... if you are getting this error and are using:

services.AddIdentityCore()

Then you will need to manually register the stuff that AddIdentity does, which can be found here: https://github.com/aspnet/Identity/blob/feedcb5c53444f716ef5121d3add56e11c7b71e5/src/Identity/IdentityServiceCollectionExtensions.cs#L79

        services.AddHttpContextAccessor();
        // Identity services
        services.TryAddScoped, UserValidator>();
        services.TryAddScoped, PasswordValidator>();
        services.TryAddScoped, PasswordHasher>();
        services.TryAddScoped();
        services.TryAddScoped, RoleValidator>();
        // No interface for the error describer so we can add errors without rev'ing the interface
        services.TryAddScoped();
        services.TryAddScoped>();
        services.TryAddScoped>();
        services.TryAddScoped, UserClaimsPrincipalFactory>();
        services.TryAddScoped>();
        services.TryAddScoped>();
        services.TryAddScoped>();

You'll need to replace TUser and TRole with your implementations of those, or the default IdentityUser, IdentityRole