c# - SubmitChanges() 引发内部服务器错误

Question

public void RejectOrder(string rejectReason, int selectedNewOrderId)
    {
        SFNewOrder sfNewOrder = mdbDataContext.SFNewOrders.FirstOrDefault(x => x.ID == selectedNewOrderId && !x.IsRejected);

        if (sfNewOrder != null)
        {
            sfNewOrder.IsRejected = true;                              
        }

        SFReject sfReject = new SFReject();

        sfReject.SFNewOrderID = sfNewOrder.ID;
        sfReject.RejectReason = rejectReason;
        sfReject.RejectedDate = DateTime.Now;           
        sfReject.RejectedBy = 2;

        mdbDataContext.SFRejects.InsertOnSubmit(sfReject);
        mdbDataContext.SubmitChanges();
    }

在这里，我想更改表中的IsRejected属性并SFNewOrder在 SFReject 表中插入新记录。但我得到

内部服务器错误

...在

mdbDataContext.submitchanges();

请帮助...在此先感谢。

Answer 1

public void RejectOrder(string rejectReason, int selectedNewOrderId, User user)
{
    SFNewOrder sfNewOrder = mdbDataContext.SFNewOrders.FirstOrDefault(x => x.ID == selectedNewOrderId && !x.IsRejected);

    if (sfNewOrder != null)
    {
        sfNewOrder.IsRejected = true;                              
    }

    SFReject sfReject = new SFReject();

    sfReject.SFNewOrder = sfNewOrder; 
    sfReject.RejectReason = rejectReason;
    sfReject.RejectedDate = DateTime.Now;           
    sfReject.User= user;

    mdbDataContext.SFRejects.InsertOnSubmit(sfReject);
    mdbDataContext.SubmitChanges();
}

由于我在 SFReject 表中有 2 个外键，因此我需要分配该表的整个对象。它的工作:)