Write data to the NOD before document closes?

[nshupeFMPE3]

I'm trying to find what event would be the best to react to in in order to write data to the NOD before the document closes. I've tried reacting to 

Application.DocumentManager.DocumentDestroyed += new DocumentDestroyedEventHandler(docColDocDestroyed)

but get an error when trying to create a transaction. 

And when I try to react to

Document.BeginDocumentClose

I get an eLockedViolation. The violation comes from an external assembly that I cant change, and I need the assembly for backwards compatibility (I'm only doing this part for backwards compatibility.)

Any help would be greatly appreciated!

[_gile · Accepted solution]

Hi,

Try to handle the DocumentToBeDestroyed event and, in the event handler, use an OpenCloseTransaction instead of a standard Transaction.

[nshupeFMPE3]

that appears to have worked, thank you Sir!

[nshupeFMPE3]

it appears that the Transaction completes without failing, but that the changes are not saved to the NOD as the changes do not appear when opening the file again.

[_gile]

You have to save the document.

This works for me:

        private void Docs_DocumentToBeDestroyed(object sender, DocumentCollectionEventArgs e)
        {
            var db = e.Document.Database;
            using (var tr = db.TransactionManager.StartOpenCloseTransaction())
            {
                var nod = (DBDictionary)tr.GetObject(db.NamedObjectsDictionaryId, OpenMode.ForRead);
                DBDictionary dict;
                if (nod.Contains("FOO"))
                {
                    dict = (DBDictionary)tr.GetObject(nod.GetAt("FOO"), OpenMode.ForRead);
                }
                else
                {
                    dict = new DBDictionary();
                    nod.UpgradeOpen();
                    nod.SetAt("FOO", dict);
                    tr.AddNewlyCreatedDBObject(dict, true);
                }
                Xrecord xrec;
                if (dict.Contains("Bar"))
                {
                    xrec = (Xrecord)tr.GetObject(dict.GetAt("Bar"), OpenMode.ForWrite);
                }
                else
                {
                    xrec = new Xrecord();
                    if (!dict.IsWriteEnabled)
                        dict.UpgradeOpen();
                    dict.SetAt("Bar", xrec);
                    tr.AddNewlyCreatedDBObject(xrec, true);
                }
                xrec.Data = new ResultBuffer(new TypedValue(1, "baz"));
                tr.Commit();
            }
            dynamic acadDoc = e.Document.GetAcadDocument();
            acadDoc.Save();
        }

[SRSDS]

Does this save the document on closing regardless of whether or not the user has chosen not to?

Your solution here is another which doesn't. https://forums.autodesk.com/t5/net/how-to-catch-save-quit-document/m-p/8321676#M60415