对我来说，似乎错过了上下文说明：
UserManagerFactory = () => new UserManager<ApplicationUser>(new UserStore<ApplicationUser>());
应该
UserManagerFactory = () => new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
对我来说，似乎错过了上下文说明：
UserManagerFactory = () => new UserManager<ApplicationUser>(new UserStore<ApplicationUser>());
应该
UserManagerFactory = () => new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
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