重写OnModelCreating时，可以遵循“代码优先”方法，添加以下行：

System.Data.Entity.Database.SetInitializer<ApplicationDbContext>(null);

上一行将AspNetIdentity实体链接到您的表，而无需重新创建表。
代码示例：

protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<ApplicationUserRole>().ToTable("UserRoles");
    modelBuilder.Entity<ApplicationUserLogin>().ToTable("UserLogins");
    modelBuilder.Entity<ApplicationUserClaim>().ToTable("UserClaims");
    modelBuilder.Entity<ApplicationRole>().ToTable("Roles");

    System.Data.Entity.Database.SetInitializer<ApplicationDbContext>(null);
}