Question

I’ve some classes, for example, Parent and Children. Parent have a collection of Children objects, and I use Linq 2 SQL to persist them. The problem is: if some properties change in the Children object, I may need to update the Parent object, and I need to check it before persisting.

I have a ChildrenRepository with the Insert(Children children) method, that basically calls the InsertOnSubmit(Children children) method from Linq 2 SQL, and the Save() method that calls the SubmitChanges() from Linq 2 SQL. I want to check in the Save() method if there’s any Children object that was modified, and if there’s, do the work. How could I do that?

Answer 1

If you have reference to the child object:

var changes = context.GetChangeSet();
if (changes.Updates.Contains(yourChildObject))
    // Update Parent

else

changes.Updates.Where(o => o is Child);