ASP.NET Core身份UserManager使用FindByEmailAsync查找不存在的用户

Question

I've been trying to use ASP.NET Core Identity in order to check for existing users in my db and when I call FindByEmailAsync or other Find methods on UserManager class it finds entity with Id even though AspNetUsers DB table is empty

I've doublechecked my Startup.cs file, because I'm almost sure that has to be something with DI. But I use this EntityManager in my service class and this class is being registered as Scoped.

It doesn't matter what i type in parameter, always returns some entity:

My Startup DI configurations:

My User (derives from IdentityUser):

My service registration (where I use UserManager via DI):

I expect these methods not to find any user entities, but for some reason it always returs non-null values.

Might be the Identity caching or DI problems?

Answer 1

FindByEmailAsync method returns a Task , not a user. If you check the type of the userExists variable, you will see that it's of type Task<> . So, the method doesn't return a user with id 70, but a Task with id 70. If you modify this line:

var userExists = _userManager.FindByEmailAsync("rasfafasf");

by adding await :

var userExists = await _userManager.FindByEmailAsync("rasfafasf");

you will get an actual result of a Task, which is the user with that email ( null in your case).