LightSwitch - SaveChanges/GetChanges ignoring Foreign Key changes RRS feed

  • Question

  • I'm basically following the Audit Trail solution by Paul Van Bladel: http://blog.pragmaswitch.com/?p=291.  I ran into an issue where the returned changes don't include entries for the foreign key fields.

    Here's the SaveChanges that calls CreateModifyAuditRecord which works fine:

    partial void SaveChanges_Executing() { EntityChangeSet changes = this.DataWorkspace.TrackerData.Details.GetChanges(); var x = this.DataWorkspace.TrackerData.Details.Properties.Incidents; foreach (var mod in changes.ModifiedEntities) { CreateModifyAuditRecord(mod); } }

    Here's where the problem occurs:

            private void CreateModifyAuditRecord(IEntityObject entity) 
                var changes = entity.Details.Properties.All().OfType<IEntityStorageProperty>();
                foreach (IEntityStorageProperty chg in changes)
                    if (chg.Name != "RowVersion")
                        if (!object.Equals(chg.Value, chg.OriginalValue))
                            AuditIncident change = this.DataWorkspace.TrackerData.AuditIncidents.AddNew();
                            change.ChangedBy = this.Application.User.FullName;
                            change.ChangedDate = DateTime.Now;
                            change.ChangeType = "Updated";
                            change.ChangedProperty = chg.Name;
                            change.OldValue = chg.OriginalValue.ToString();
                            change.NewValue = chg.Value.ToString();
                            change.EntitytId = (int)entity.Details.Properties["Id"].Value;

    The "foreach (IEntityStorageProperty chg in changes)" includes the RowVersion change when a child table is updated, but the property that changed (LookupProvider) is not listed. This is a multi-select relationship to tie multiple Providers to an Incident.

    MultiChoice Lookup relationship

    Any ideas on how to capture this info since there's no Property/Value/OldValue in the collection?

    Thank you.


    Tuesday, May 28, 2013 9:09 PM


  • Change ientitystorageproperty to ientitytrackedproperty and it should work.
    Wednesday, May 29, 2013 3:53 AM

All replies

  • Hi.  I'm not at my dev machine but if I recall, I think you need to also loop through the navigation properties.  Check Intelisense for for something like "IEntityNavigationProperty".

    Hope this helps.


    Wednesday, May 29, 2013 1:58 AM
  • Change ientitystorageproperty to ientitytrackedproperty and it should work.
    Wednesday, May 29, 2013 3:53 AM
  • That did it!  Thanks!!
    Wednesday, May 29, 2013 1:29 PM
  • Great, glad it works!
    Thursday, May 30, 2013 1:51 AM
  • Hi, 

    I have also added relationship tables.  still i am not able to track those properties using  ientitytrackedproperty . any help on this?

    Thanks in Advance.

    Wednesday, June 24, 2015 10:05 AM