API onDocumentChange not triggering

[gert-leonvanlier]

I have the following code. When saving, closing or opening, the application events are triggered, but the change event does not. Does anyone have a clue?

public void Activate(ApplicationAddInSite addInSiteObject, bool firstTime)
            {
                try
                {
                    // Initialize AddIn members.
                    Globals.invApp = addInSiteObject.Application;

                    Globals.invApp.ApplicationEvents.OnDocumentChange += onChange;
                    Globals.invApp.ApplicationEvents.OnSaveDocument += onSaving;
                    Globals.invApp.ApplicationEvents.OnCloseDocument += onClosing;
                    Globals.invApp.ApplicationEvents.OnOpenDocument += onOpen;

                }
                catch (Exception ex)
                {
                    MessageBox.Show("Unexpected failure in the activation of the add-in " + System.Environment.NewLine + System.Environment.NewLine + ex.Message);
                }

            }

            private bool isSaving = false;

            private void onChange(_Document DocumentObject, EventTimingEnum BeforeOrAfter, CommandTypesEnum ReasonsForChange, NameValueMap Context, out HandlingCodeEnum HandlingCode)
            {
                if (BeforeOrAfter == EventTimingEnum.kAfter)
                {
                    MessageBox.Show("Hello");
                }
                HandlingCode = HandlingCodeEnum.kEventNotHandled;
            }

            private void onOpen(_Document DocumentObject, string FullDocumentName, EventTimingEnum BeforeOrAfter, NameValueMap Context, out HandlingCodeEnum HandlingCode)
            {
                if (BeforeOrAfter == EventTimingEnum.kAfter)
                {
                    MessageBox.Show("Hello");
isSaving);
                }
                HandlingCode = HandlingCodeEnum.kEventNotHandled;
            }

            private void onClosing(_Document DocumentObject, string FullDocumentName, EventTimingEnum BeforeOrAfter, NameValueMap Context, out HandlingCodeEnum HandlingCode)
            {
                if (BeforeOrAfter == EventTimingEnum.kBefore)
                {
                    MessageBox.Show("Hello");
                }
                HandlingCode = HandlingCodeEnum.kEventNotHandled;
            }

            private void onSaving(_Document DocumentObject, EventTimingEnum BeforeOrAfter, NameValueMap Context, out HandlingCodeEnum HandlingCode)
            {
                if (BeforeOrAfter == EventTimingEnum.kBefore)
                {
                    MessageBox.Show("Hello");
                }
                HandlingCode = HandlingCodeEnum.kEventNotHandled;
            }

[bradeneuropeArthur]

This is a DocumentEvent!

[gert-leonvanlier]

But using the Event Watcher there is also OnDocumentChange in ApplicationEvents. It is also listed as an object of ApplicationEvents when I program.

But I will try DocumentEvents too.

[JelteDeJong]

I have very similar code that does work.  The main difference is that in my code the event object (Globals.invApp.ApplicationEvents.OnDocumentChange) is in the same object as where the event handlers are created.  I know that the events objects are very sensitive for the garbage collector.  (Check this post) 

[gert-leonvanlier]

---

@JelteDeJong wrote:

I have very similar code that does work.  The main difference is that in my code the event object (Globals.invApp.ApplicationEvents.OnDocumentChange) is in the same object as where the event handlers are created.  I know that the events objects are very sensitive for the garbage collector.  (Check this post) 

---

@JelteDeJongI read the other post, but I don't really understand what it means. And then in particular this senctence: "When subscribing to events from .NET, you need to also hold on to a reference to the xxxEvents object (in this case, ApplicationEvents). Otherwise, the temporary reference you used to subscribe to the event gets garbage-collected."

[gert-leonvanlier · Accepted solution]

I foudn the issue after I came across this post this morning. Ater I set Embed Interop Types to False and run the code, the onChange event was triggered.