OnAppointmentChanged or OnAppointmentAdded

[x]

I need an OnAppointmentChanged or OnAppointmentAdded event to be able to save the change or the new appointment.

I could not find such events. How to achieve this goal?

[Yana]

Hello,

You could subscribe to the AppointmentsSource CollectionChanged event and it its handler track when a new appointment is added or an existing appointment is deleted. Here is a quick example:

(calendar.AppointmentsSource as ObservableCollection<Appointment>).CollectionChanged += (sender, e) =>
{
    if(e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
    {
        var newApp = e.NewItems[0] as Appointment;
    }                 
};

As to an existing appointments changes - you would need to subscribe to PropertyChanged event of each appointment to track for updates:

foreach(var appt in (calendar.AppointmentsSource as ObservableCollection<Appointment>))
{
    appt.PropertyChanged += (sender, e) =>
    {
        var updatedApp = sender as Appointment;
    };
}

I agree that providing ready-to-use events for appointments updates will be quite helpful, so I logged a feature request on your behalf regarding this functionality. You can cast your vote and track its status at the link below:

https://feedback.telerik.com/xamarin/1435845-calendar-add-events-for-appointments-changes

Let me know if I can help with anything else.

Regards,
Yana
Progress Telerik

[Kaan]

Hi Yana,

I tried to use these codes, but I get a System.NullReferenceException by 

"(calendar.AppointmentsSource as ObservableCollection<Appointment>)"

What do I have to do, else?

[Yana]

Hi Kaan,

One possible reason for the error is if you try to get the Calendar AppointmentsSource too early - in order to ensure that the AppointmentsSource is available, you can use the PropertyChanged event of the Calendar like this:

<telerikInput:RadCalendar x:Name="calendar"
                          PropertyChanged="calendar_PropertyChanged"
				.... />

And the event handler:

private void calendar_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
    if (e.PropertyName == nameof(RadCalendar.AppointmentsSource))
    {
        if((sender as RadCalendar).AppointmentsSource != null)
        {
            // subscribe to CollectionChanged here
        }
    }
}

Also please check the AppointmentsSource is valid and of the same type.

Give it a try and let me know how it goes.

Regards,
Yana
Progress Telerik

[Kaan]

I was able to solve it myself. It was because I did not check if the list of appointments is greater than 0. 

But thank you for the fast support. The Support of telerik is great.

Best regards,

Kaan Congar