ef数据迁移 外键报错

Question

public class Department {

        [Key]        public int ID { get; set; } = 0;

        [Required]        public string Name { get; set; } = "";        public virtual ICollection<User> Users { get; set; }
    }

public class User {

        [Key]        public int ID { get; set; } = 0;        public int DepartID { get; set; } = 0;

        [StringLength(30)]        public string Username { get; set; } = "";

        [ForeignKey("DepartID")]        public virtual Department Department { get; set; }
    }

protected override void Seed(GCSecurity.MVC.DAL.GCDbContext context) {            var departs = new List<Department> {                new Department{ ID = 1, Name = "办公室" }
            };
            articles.ForEach(s => context.Articles.Add(s));
            context.SaveChanges();

            context.Users.Add(new User {
                ID = 1,
                Username = "admin",
                DepartID = 1
            });
            context.SaveChanges();
}

Answer 1

正常的，谁让你用INT自增做主键呢。只能自己想想咋办咯。