Bug in the revit documentation for DialogBoxShowing Event

[Anonymous]

Here is the link. 

Will the call to show the TaskDialog from within an event handler that handles the DialogShow event not create an infinite loop?

I am getting a stack overflow exception. If I remove the TaskDialog show below, it works fine. 

[jeremytammik]

Dear Jeetendra,

Thank you for your report.

Maybe the sample code in the documentation worked once upon a time and has not been updated.

Can you please provide a minimal reproducible case that I can pass on to the development team for analysis?

http://thebuildingcoder.typepad.com/blog/about-the-author.html#1b

Thank you!

Best regards,

Jeremy

[Anonymous]

public class Class1 : IExternalApplication
    {
        // Implement the OnStartup method to register events when Revit starts.
    public Result OnStartup(UIControlledApplication application)
    {
        // Register related events
        application.DialogBoxShowing += 
            new EventHandler<Autodesk.Revit.UI.Events.DialogBoxShowingEventArgs>(AppDialogShowing);
        return Result.Succeeded;
    }

    // Implement this method to unregister the subscribed events when Revit exits.
    public Result OnShutdown(UIControlledApplication application)
    {
        // unregister events
        application.DialogBoxShowing -= 
            new EventHandler<Autodesk.Revit.UI.Events.DialogBoxShowingEventArgs>(AppDialogShowing);
        return Result.Succeeded;
    }

    // The DialogBoxShowing event handler, which allow you to 
    // do some work before the dialog shows
    void AppDialogShowing(object sender, DialogBoxShowingEventArgs args)
    {
        // Get the string id of the showing dialog
        String dialogId = args.DialogId;

        // Format the prompt information string
        String promptInfo = "A Revit dialog will be opened.\n";
        promptInfo += "The DialogId of this dialog is " + dialogId + "\n";
        promptInfo += "If you don't want the dialog to open, please press cancel button";

        // Show the prompt message, and allow the user to close the dialog directly.
        TaskDialog taskDialog = new TaskDialog("Revit");
        taskDialog.Id = "Customer DialogId";
        taskDialog.MainContent = promptInfo;
        TaskDialogCommonButtons buttons = TaskDialogCommonButtons.Ok | 
                                            TaskDialogCommonButtons.Cancel;
        taskDialog.CommonButtons = buttons;
        TaskDialogResult result = taskDialog.Show();
        if (TaskDialogResult.Cancel == result)
        {
            // Do not show the Revit dialog
            args.OverrideResult(1);
        }
        else
        {
            // Continue to show the Revit dialog
            args.OverrideResult(0);
        }
    }
    }

Here is the minimal reproducible case.