cannot create new user in web-api 2

Question

I'm trying to create a new user when receiving a POST request to api/accounts/ in my asp.net web-api 2 project.

Attempt 1: Create Identity User

I've tried exactly as it was shown in the project template:

// Inside Post() method
IdentityUser newUser = new IdentityUser()
{
    UserName = "username",
};
IdentityResult result = await this.UserManager.CreateAsync(newUser, "password");

System.Data.Entity.Core.UpdateException: Cannot insert the value NULL into column 'Discriminator', table 'MyDb.dbo.AspNetUsers'; column does not allow nulls. INSERT fails.\\r\\nThe statement has been terminated.

Attempt 2: Create a User

I've also tried adding my subclassed version of IdentityUser :

// Definition
public class User : IdentityUser
{
    public User() { }
}

// Inside Post() method
User newUser = new User()
{
    UserName = userDto.Email,
};
IdentityResult result = await this.UserManager.CreateAsync(newUser, "password");

System.InvalidOperationException: Mapping and metadata information could not be found for EntityType 'MyProject.Data.User'.

It was working originally and I can't figure out why it isn't anymore. Originally I added two fields onto my User object (FirstName, Lastname) but I still have the problem after removing them.

Answer 1

对于asp身份2.2，Discriminator列已删除表单数据库，您可以迁移数据库或只是删除列