EntityFramework尝试创建指向同一个表的多个链接,FK Constraint错误

问题描述 投票:1回答:1

我有一个名为DeliveryRequest的表和另一个名为Operator的表,表DeliveryRequest如下:

public class DeliveryRequest
{
    public int ID { get; set; }
    public DateTime Date { get; set; }
    public string UserID { get; set; }
    public string Waybill { get; set; }
    public string Reference { get; set; }
    public int SupplierID { get; set; }
    public Supplier Supplier { get; set; }
    //[ForeignKey("Operator")]
    public int SenderID { get; set; }
    public Operator Sender { get; set; }
    //[ForeignKey("Operator")]
    public int ReceiverID { get; set; }
    public Operator Receiver { get; set; }
    public string Origin { get; set; }
    public string Destination { get; set; }
    public int ServiceID { get; set; }
    public Service Service { get; set; }
}

而表运算符如下:

public class Operator
{
    public int ID { get; set; }
    public string Company { get; set; }
    public int ContactID { get; set; }
    public Contact Contact { get; set; }
    public int AddressID { get; set; }
    public Address Address { get; set; }
}

所以问题是,当我尝试更新我的数据库时,我得到一个FK约束错误,如下所示:

在表'DeliveryRequests'上引入FOREIGN KEY约束'FK_dbo.DeliveryRequests_dbo.Operators_SenderID'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION,或修改其他FOREIGN KEY约束。无法创建约束或索引。查看以前的错误。

而之前的错误是一样的。如下:

System.Data.SqlClient.SqlException(0x80131904):在表'DeliveryRequests'上引入FOREIGN KEY约束'FK_dbo.DeliveryRequests_dbo.Operators_SenderID'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION,或修改其他FOREIGN KEY约束。

专注于发件人和接收者部分,我不是专家,但错误必须在那里大声笑

//[ForeignKey("Operator")]
public int SenderID { get; set; }
public Operator Sender { get; set; }
//[ForeignKey("Operator")]
public int ReceiverID { get; set; }
public Operator Receiver { get; set; }
sql sql-server asp.net-mvc entity-framework
1个回答
1
投票

看起来你正在使用Code First方法。因此,请尝试为DeliveryRequests关闭CascadeDelete:

modelBuilder.Entity<DeliveryRequests>()
    .HasRequired(c => c.Operator )
    .WithMany()
    .WillCascadeOnDelete(false);

例如:

public class YourDBContext: DbContext 
{
    public YourDBContext(): base() 
    {
    }


    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<DeliveryRequests>()
            .HasRequired(c => c.Operator )
            .WithMany()
            .WillCascadeOnDelete(false);    
    }
}
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