Specify a cascading delete for parent / child relationships?

问题

Model:

public class MenuItem
{
    public Guid Id {get;set;}
    public virtual Guid? ParentMenuItemId {get;set;}
    public virtual MenuItem ParentMenuItem {get;set;}
    public virtual ICollection<MenuItem> ChildMenuItems {get;set;}
}

current mapping:

HasOptional(m => m.ParentMenuItem).WithMany(p => p.ChildMenuItems).HasForeignKey(m => m.ParentMenuItemId);

I tried adding the WillCascadeOnDelete(true), but I got an error. How should I update my mapping to allow for cascading deletes? So, If I delete a Parent, all the children will be deleted. Do I have to do this manually?

回答1:

In your model, just look at the association's properties. There is an OnDelete that you can set to Cascade. The XML should look like this:

<OnDelete Action="Cascade" />

来源：https://stackoverflow.com/questions/9432994/specify-a-cascading-delete-for-parent-child-relationships