Linq To Sql，对实体的扩展删除将不再允许它删除

Question

I have 2 entities, for example Parent and Child.

what I'm trying to achieve here is to have Delete method of entity Child extended so i can do some stuff when it is Deleting, here is what i have done so far:

partial class MyDataClassDataContext
{
    partial void DeleteChild(Child instance)
    {
        //My Custom Code Here
    }
}

there is an event in the code that would delete a Parent and all of its Children, something like this:

 void DeleteParent(Parent itemParent)
 {
    var ListChilds = db.Parents.Where(p=>p == itemParent).Select(p=>p.Childs);
    if(ListCilds.Any())
    {
       db.Chields.DeleteAllOnSubmit(ListCilds);
    }
    db.Parents.DeleteOnSubmit(itemParent);
    db.SubmitChanges();
 } 

This code always worked, but when i try to extend the Delete method of Child, it seems to wait for me to decide whether or not to delete them, and i get an exception that Parent cannot be deleted where it have Child.

Answer 1

我认为您必须在您的delete child方法中找到所有Parents并从其Childs集合中删除此特定孩子...这将删除关系，然后您可以删除孩子本身。