Entity Framework：如何删除相互引用的 table 行？

Question

如何在不出现此异常的情况下删除订单？

UserLicenses 引用 SerialOnOrderDetails 反之亦然：

The DELETE statement conflicted with the REFERENCE constraint "FK_SerialsOnOrderDetail_UserLicenses". The conflict occurred in database "sales", table "dbo.SerialsOnOrderDetail", column 'UserLicenseId'.

删除已确认的控制器操作代码：

[Authorize(Roles = "admin")]    
[HttpPost, ActionName("Delete")]
public async Task<ActionResult> DeleteConfirmed(int id)
{
    Order order = GetOrderById(id);

    if (order.UserLicenses.Count > 0)
    {
        context.UserLicenses.RemoveRange(order.UserLicenses);
    }

    if (order.SerialsOnOrderDetails.Count > 0)
    {
        context.SerialsOnOrderDetails.RemoveRange(order.SerialsOnOrderDetails);
    }

    context.Orders.Remove(order);

    context.SaveChanges(); // Exception here !!!
}

[编辑] 添加实时数据

实时数据（Id = UserLicenseId）：

额外类：

public partial class UserLicense
{   
    public string Id { get; set; }
    public int OrderId { get; set; }
    public string ProductId { get; set; }
    public int CustomerId { get; set; }
    public string AssignedUserId { get; set; }
    public bool IsActive { get; set; }

    public virtual AspNetUser AspNetUser { get; set; }
    public virtual Customer Customer { get; set; }
    public virtual Order Order { get; set; }
    public virtual Product Product { get; set; }

    public virtual ICollection<SerialsOnOrderDetail> SerialsOnOrderDetails { get; set; }
}

public partial class SerialsOnOrderDetail
{
   public int orderID { get; set; }
   public string serial { get; set; }
   public string productID { get; set; }
   public string UserLicenseId { get; set; }
   public int customerID { get; set; }

   public virtual Product Product { get; set; }
   public virtual Serial Serial1 { get; set; }
   public virtual Order Order { get; set; }
   public virtual UserLicense UserLicense { get; set; }
   public virtual Customer Customer { get; set; }
}

public partial class Order
{
    public Order()
    {
        this.OrderDetails = new HashSet<OrderDetail>();
        this.SerialsOnOrderDetails = new HashSet<SerialsOnOrderDetail>();
        this.UserLicenses = new HashSet<UserLicense>();
    }

    public int orderID { get; set; }
    public int customerID { get; set; }
    public string promoCodeID { get; set; }
    public System.DateTime date { get; set; }
    public Nullable<int> resellerID { get; set; }
    public string invoiceID { get; set; }
    public string poNumber { get; set; }
    public Nullable<System.DateTime> paymentDate { get; set; }
    public Nullable<bool> validated { get; set; }
    public string resellerOrderID { get; set; }
    public Nullable<int> parentOrderID { get; set; }
    public int months { get; set; }

    public virtual Customer Customer { get; set; }
    public virtual ICollection<OrderDetail> OrderDetails { get; set; }
    public virtual PromoCode PromoCode { get; set; }
    public virtual Reseller Reseller { get; set; }
    public virtual ICollection<SerialsOnOrderDetail> SerialsOnOrderDetails { get; set; }
    public virtual Order ParentOrder { get; set; }
    public virtual ICollection<UserLicense> UserLicenses { get; set; }
}

Answer 1

您是否验证过 UserLicenses 和 SerialsOnOrderDetails 集合是否正确加载且不为空？您确定 removerange 是正确的方法吗？如果你不习惯，我建议你阅读一些关于 EF 的教程。

也许您必须使用 .Include("...") 指令更新 GetOrderById 以加载这些集合，或手动加载相关项目。

Answer 2

您引用的约束消息来自基础 SQL 服务器。这不是 EF 错误，它已通过。

当我在 TSQL 中遇到此类问题时，解决方案通常是在单个事务中删除两个相互引用的行。

虽然我对 EF 不是很熟悉，但快速搜索会找到这个将多个操作放入单个事务上下文的示例，而不是每个操作单个事务的默认行为。

{
    context.Database.Log = Console.WriteLine;
    using (DbContextTransaction transaction = context.Database.BeginTransaction())
    {
        try
        {
            Author author1 = new Author() {    Name = "Mark" };
            Author author2 = new Author() {    Name = "John" };
            
            context.Authors.Add(author1);
            context.SaveChanges();
            
            context.Authors.Add(author2);
            context.SaveChanges();
            transaction.Commit();
        }
        catch (Exception ex)
        {
            transaction.Rollback();
        }
    }
}

我注意到另一位受访者描述了其他可能出错的地方。完全有可能我们都是对的，并且有多个问题需要解决。

Entity Framework：如何删除相互引用的 table 行？

Entity Framework: How do I delete table rows that reference each other?

c#

asp.net-mvc

entity-framework