DocumentToBeDeactivated Event

[joantopo]

Hi. I want to use this Event: AcadApp.DocumentManager.DocumentToBeDeactivated += callback_documentToBeDeactivated; In this Event, I want to GetAlignments() from active document, although I get this exception within GetAlignments() method. Autodesk.Civil.ApplicationServices.CivilDocument civDoc = default(Autodesk.Civil.ApplicationServices.CivilDocument); civDoc = Autodesk.Civil.ApplicationServices.CivilApplication.ActiveDocument; //obtener el documento de Civil Debugger throws in "civDoc" line: System.NullReferenceException.

[Jeff_M]

I'm pretty sure the CivilApplication's ActiveDocument is released prior to the AutoCad DocumentToBeDeactivated Event fires, this is why you are seeing that exception. The CivilDocument doesn't have any Events to tie to for this.

[joantopo]

Thanks Jeff. I thought the same. However, with "ToBeDestroyed" event I don´t get that exception. With this event works fine until it must execute Commit(). using (DocumentLock docLock = doc.LockDocument()) { using (Transaction trans = db.TransactionManager.StartTransaction()) { Alignment align = trans.GetObject(alineacion.Id, OpenMode.ForWrite) as Alignment; align.Description = cadenaTotal; trans.Commit(); } //final transmit } //final Lock

[joantopo]

but in this case I don´t get any exception. Debugger stop in "transmit()" method.

[joantopo]

Hi Jeff. Now, it works fine. There is no problem with ToBeDeactivated unless you close the drawing, but I only wanted it to change between activated document and it works fine. I use other events as: -documentCreated to add for each open drawing or created drawing-->beginSave event. Then,If I save drawing, I can modify before description alignment.

[joantopo]

@Jeff_M  hello!

I am reviewing this post because I am in the same scenario in my new app.

I use both events: DocumentActivated   &   DocumentToBeDeactivated.

I have a break point in both events, so when I change the current document, it seems that "DocumentToBeDeactivated" is fired before, but if I have a transaction in that event, I get the exception = NullReferenceException, 

  using (Transaction trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction())

The parameter WorkingDataBase = Null.

So, it just happens this for Civil Documents? not in AutoCAD documents?

I don´t know how to solve this.

[Jeff_M · Accepted solution]

Have you tried using the Document's database instead?

        static void DocumentManager_DocumentToBeDeactivated(object sender, DocumentCollectionEventArgs e)
        {
           using (Transaction trans = e.Document.Database.TransactionManager.StartTransaction())
           {
              ;;your code
           }
         }