Question

I have created an extensibility method for deleting one of my Linq To Sql objects called Reservation.

Well, in this partial method I created, I want to update some other objects. I can’t seem to get the update to be persisted in the database. Here is my partial method for deleting the reservation.

public partial class LawEnforcementDataContext {      partial void DeleteReservation(Reservation instance)     {         // Get ID's of those seated in course         var roster = new Roster(this, instance.CourseID);         var seated = from r in roster.All                      where r.WaitingList == false                      select r.ID;          // delete the reservation         this.ExecuteDynamicDelete(instance);          // get seated id's not in original seated ids         var newlySeated = from r in roster.All                           where r.WaitingList == false && !seated.Contains(r.ID)                           select r.ID;          var reservations = this.Reservations.Where(r => newlySeated.Contains(r.ID));          foreach (var r in reservations)         {             r.Confirmed = false;             // Have tried doing nothing, thinking calling code's db.SubmitChanges() would do the trick             //this.ExecuteDynamicUpdate(r); HAVE TRIED THIS         }         //this.SubmitChanges(); HAVE TRIED THIS     } } 

The delete is taking place but the update is not. Commented in the last few lines are some of the things I have tried.

Any ideas? Thanks!

EDIT

Here is what I have done to solve this:

   public override void SubmitChanges(System.Data.Linq.ConflictMode failureMode) {     ChangeSet delta = GetChangeSet();      foreach (var res in delta.Deletes.OfType<Reservation>())     {         // Get ID's of those seated in course         var roster = new Roster(this, res.CourseID);         var seated = from r in roster.All                      where r.WaitingList == false                      select r.ID;          base.SubmitChanges(failureMode);          // get seated id's not in original seated ids         var newlySeated = from r in roster.All                           where r.WaitingList == false && !seated.Contains(r.ID)                           select r.ID;          var reservations = this.Reservations.Where(r => newlySeated.Contains(r.ID));          foreach (var r in reservations)         {             r.Confirmed = false;         }     }      base.SubmitChanges(failureMode); } 

Answer 1

I expect the problem here is that it has already called GetChangeSet().

I suggest you override SubmitChanges() at the data-context, and apply this logic there instead…

partial class LawEnforcementDataContext {     public override void SubmitChanges(         System.Data.Linq.ConflictMode failureMode)     {         ChangeSet delta = GetChangeSet();         foreach (var reservation in delta.Deletes.OfType<Reservation>())         {             // etc         }         base.SubmitChanges(failureMode);     } }