Application.OnUndoOrRedo(bstrLabel, bstrGUID, fUndo) event is not firing as expected

Question

I am using Visual Studio Tools For office, with Visual Studio 2010 to customize Microsoft Project 2010 using C#.

The runtime version for the Interop Assembly is: v2.0.50727

There is an event on the Application Object:

documented here: http://msdn.microsoft.com/en-us/library/ff864594.aspx

Application.OnUndoOrRedo(bstrLabel, bstrGUID, fUndo)

My code looks as below: 

  private void ThisAddIn_Startup(object sender, EventArgs e)
        {
            
            initializeLogging();
            Application.OnUndoOrRedo += new _EProjectApp2_OnUndoOrRedoEventHandler(Application_OnUndoOrRedo);
}

 void Application_OnUndoOrRedo(string bstrLabel, string bstrGUID, bool fUndo)
        {
            //throw new NotImplementedException();
        }

This event is not being fired when I try to undo a transaction.

This same question was asked here:

http://social.technet.microsoft.com/Forums/en-US/project2010custprog/thread/e87a1bb0-9890-461f-8029-54a3f0989fcb/

But with no answer.

Is this a known problem?

Am I doing something wrong?

Any help would be appreciated.

Answer 1

Should I report this as a bug, if so where do I do that? Surely somebody has a suggestion or a workaround to this problem.

Answer 2

Thomas,

I'm looking into this issue. And I could reproduce the behavior as you mentioned. However, I'd like to double-check this with other professional before we move to next step.

Best Regards, 

---

Forrest Guo | MSDN Community Support | Feedback to us

Answer 3

Thomas,

Good news, after investigate on this question further, I found the trick. That is:

1. People need to use OpenUndoTransaction and CloseUndoTransaction method together with the event; referring to: http://msdn.microsoft.com/en-us/library/ff864594.aspx
2. We need to specify Guid parameter for OpenUndoTransaction method, this is required. Code sample looks like below:

public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            //Application.OpenUndoTransaction("task");

            //Sub CreateTasksWithUndoTransaction() 
            //ActiveProject.Tasks.Add "Task outside transaction" 
            //Application.OpenUndoTransaction "Create 6 tasks" 
            //Dim i As Integer 
            //For i = 1 To 6 
            //    ActiveProject.Tasks.Add "UndoMe " & i 
            //Next 
            //Application.CloseUndoTransaction  
            //End Sub 

            CreateTasksWithUndoTransaction();

            Application.OnUndoOrRedo += new MSProject._EProjectApp2_OnUndoOrRedoEventHandler(Application_OnUndoOrRedo);

        }

        void Application_OnUndoOrRedo(string bstrLabel, string bstrGUID, bool fUndo)
        {
            Application.StatusBar = bstrLabel + " undo or redo";
        }

        private void CreateTasksWithUndoTransaction()
        {
            Application.ActiveProject.Tasks.Add("Task outside transaction");

            Application.OpenUndoTransaction("Create 6 tasks", "{A5797E62-C816-4DEC-ADA8-11A8C3A6DEB7}");

            for (int i = 1; i <= 6; i++)
            {
                Application.ActiveProject.Tasks.Add("UndoMe " + i.ToString());
            }
            Application.CloseUndoTransaction();
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }

---

Forrest Guo | MSDN Community Support | Feedback to us

Answer 4

Thank you so much, that was it.