LINQ To Entity Framework - 级联删除 - 错误 [重复]

Question

我有两个这样的相关表：

用户

 public partial class Users
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Users()
        {
            this.Orders = new HashSet<Orders>();
        }
    
        public int ID { get; set; }
        public int UserType_ID { get; set; }
        public string Email { get; set; }

    
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Orders> Orders { get; set; }
        public virtual UserTypes UserTypes { get; set; }
    }

订单

 public partial class Orders
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Orders()
        {
            this.Payments = new HashSet<Payments>();
        }
    
        public int ID { get; set; }
        public int User_ID { get; set; }
        public int Plan_ID { get; set; }
        public System.DateTime Date { get; set; }
        public int OrderStatus_ID { get; set; }
    
        public virtual OrderStatus OrderStatus { get; set; }
        public virtual Plans Plans { get; set; }
        public virtual Users Users { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Payments> Payments { get; set; }
    }

现在我想强制实体框架级联删除用户行。
这是删除用户的代码：

using (Crypto_Shuffler_Entities entities = new Crypto_Shuffler_Entities())
{
    var users = from User in entities.Users
                where User.Email.ToLower() == "test@gmail.com"
                select User;
    entities.Users.Remove(users.FirstOrDefault());
    entities.SaveChanges();
}

这里有错误：

更新条目时出错。查看内部异常 了解详情。

Message = "DELETE 语句与 REFERENCE 冲突 约束“FK_Orders_Users”。数据库发生冲突 “Crypto_DB”、表“dbo.Orders”、“User_ID”列。\r\n 语句已终止。”

如何强制实体框架进行级联删除？

Answer 1

我认为您需要删除订单中的用户的第一参考 这里是一对多关系 所以根据我的观点，首先按顺序删除用户，然后将其保存到数据库，然后删除该用户的行，这可能不会冲突