实体类型MVC5 EF6中的用户

以下方法

OnModelCreating

protected override void onModelCreating(DbModelBuilder modelBuilder){    base.onModelCreating(modelBuilder);    modelBuilder.Entity<Content>()        .HasMany(c => c.Editors)        .WithOptional()        .WillCascadeonDelete(false);    modelBuilder.Entity<Content>()        .HasRequired(c => c.Owner)        .WithOptional()        .WillCascadeonDelete(false);    modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);    modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);    modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });}