ModelChanged event handler missing event args RRS feed

  • Question

  • I have implemented a ModelChanged event handler in my AddDesigner call as follows:

                 _wd.ModelChanged += wd_ModelChanged;
    The code for the ModelChanged event is:

    private void wd_ModelChanged(object sender, EventArgs e)
                ModelChangedEventArgs changedEventArgs = e as ModelChangedEventArgs;
                if(changedEventArgs != null)
                    IEnumerable<ModelItem> itemsRemoved = changedEventArgs.ItemsRemoved;
                    foreach (ModelItem modelItem in itemsRemoved)
                        if (modelItem.ItemType == typeof(Flowchart))
                            MessageBox.Show("You can not delete the base flow chart!", _appName, MessageBoxButton.OK, MessageBoxImage.Stop);
                //Add the expression text boxes to all switch and descision flow activities
    The issue I have is that there are no event args coming through, when I expected there to be event arguments from the editing context. Any ideas on what I have missed?
    Tuesday, February 23, 2010 2:12 AM

All replies

  • This is a bit of a weirdness on the API, but I don't think the workflow designer actually knows what the exact changes are. Instead you can try subscribing to ModelService.ModelChanged, that one should have some useful event information.


    Wednesday, February 24, 2010 1:23 AM
  • Thanks Tim, yeah seems to be just another little weird part of WF4 rehosting!

    I'll take a look at that and see how we progress and report back.
    Wednesday, February 24, 2010 2:49 AM
  • hi is there any solution about this issue.

    Friday, October 1, 2010 8:00 PM