Telerik.Windows.Controls.ScheduleView : System.InvalidOperationException:at System.Windows.Data.CollectionView.DeferRefresh

[Uma]

Hi Team,

We have prepared a sample for DeferRefresh issue. While creating a Appointment, changing the currentdate(View Refresh) for scheduler, it is thrown "Deferrefresh is not allowed during an addnew or edit item transaction" exception. 

In our application, we have refresh the scheduler view (Changing current date) continuously through bindable property and immediately creating the appointment. Here we are getting this exception.

Sample : https://drive.google.com/file/d/1IL_fqyugJDj2VMX7lqxGXbro1rtRU7sM/view?usp=sharing

Please suggest how to handle this issue?

Thanks,
Srinivasan

[Uma]

Any update on this?

[Véronique]

Hi,

Did you resolve your issue ? If yes, what did you do ?

I have the same error on schedule view.

Thanks,

Véronique

[Dilyan Traykov]

Hi Véronique,

I'm uncertain as to whether and how Uma solved the issue, however, in the provided sample project, the exception can be resolved by placing the change of the CurrentDate property in the BeginInvoke method of the Dispatcher:

        private void radScheduleView1_AppointmentCreating(object sender, AppointmentCreatingEventArgs e)
        {
            Dispatcher.BeginInvoke(new Action(() =>
            {
                radScheduleView1.CurrentDate = DateTime.Now;
            }));
        }

Please let me know if a similar approach works for you as well. If that is not the case, please send over the project in which you observe the exception and I will gladly try to come up with a viable solution for your specific context.

Regards,
Dilyan Traykov
Progress Telerik