Recurrence Items

[Jeremy Murtishaw]

How do you go about updating only 1 instance of a recurring appointment programmically?  Say I want to change the tooltip or background color of just the occurence highlighted rather than all occurences that exist.

[Nick]

Hi Jeremy Murtishaw,

Thank you for contacting us. If you have a recurrent appointment (for simplicity I am using Appointment[0] in the code below) which is repeated every day, you can access all its occurrences using the Occurrences property. Of course, this is an infinite sequence of Appointments so that the loop below will eventually throw stack overflow:

private void radButton1_Click(object sender, EventArgs e)
{
            foreach (Appointment appointment in this.radScheduler1.Appointments[0].Occurrences)
            {

                appointment.ToolTipText = "Some tooltip text";

            }
}

Best wishes,
Nick
the Telerik team

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[Jeremy Murtishaw]

I am using a custom Appointment Type (MyCustomAppointment).  I get the following error?  Any suggestions?

Unable to cast object of type'Telerik.WinControls.UI.Appointment' to type 'MyCustomAppointment'.

for (int i = 0; i < this.radScheduler.Appointments.Count; i++)

            {

                foreach (MyCustomAppointment appointment in this.radScheduler.Appointments[i].Occurrences)

                {

                   appointment.ToolTipText = "my tooltip";

                }

            }

public class MyCustomAppointment : Appointment

    {

        public MyCustomAppointment()

            : base()

        { }

    }

[Jordan]

Hello Jeremy Murtishaw,

The error that you get is because the objects are of type Appointment. This is because when a occurrence needs to be created the CreateOccurrence method is called. And in the Appointment class
it is overridden to create objects of type Appointment:

 public override IEvent CreateOccurrence(DateTime start)
        {
            Appointment occurrence = new Appointment();
            occurrence.Start = start;
            occurrence.Duration = this.Duration;
            occurrence.Summary = this.Summary;
            occurrence.Description = this.Description;
            occurrence.Location = this.Location;
            occurrence.ToolTipText = this.ToolTipText;
            occurrence.Visible = this.Visible;
            occurrence.AllowDelete = this.AllowDelete;
            occurrence.AllowEdit = this.AllowEdit;
            occurrence.resourceIds = this.resourceIds;
            occurrence.BackgroundId = this.BackgroundId;
            occurrence.StatusId = this.StatusId;
            occurrence.IsViewCalculated = true;
            occurrence.masterEvent = this;
            occurrence.CultureInfoProvider = this.CultureInfoProvider;

            return occurrence;
        }

In order to avoid the error you must override this method in your custom appointment class and implement it to create instances of MyCustomAppointment type instead of the Appointment type.
 
However, if you do not have custom fields or logic (i.e. you do not need a custom appointment class) you can just use the IEvent type in your code as RadScheduler does.

Sincerely yours,
Jordan
the Telerik team

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[Stephen]

Hi Jordan,
     I was having this same problem aswell, except that my application is written in VB. I have a custom class that inherits from Appointment class. After reading some other threads I have added a shadow property for Master Event, as this field does not have a setter in the base class. This works fine, the only thing that does not work is that when the recurrence appointments are displayed on the scheduler window, the recurrence icon only appears on the original first occurence, and not on the other occurences which it does if you do not use a custom appointment class. Is this a bug or am I missing something else in my custom class ?.

    Private _masterEvent As Telerik.WinControls.UI.IEvent
    Public Shadows ReadOnly Property MasterEvent() As Telerik.WinControls.UI.IEvent
        Get
            If Object.Equals(_masterEvent, Nothing) Then
                Return Nothing
            Else
                Return _masterEvent
            End If
        End Get
    End Property

''' <summary>  

''' ... for repeated occurrences   

''' </summary>  

''' <param name="start"></param>  

''' <returns></returns>  

Public Overrides Function CreateOccurrence(ByVal start As Date) As IEvent

    Dim occurrence As OutlookLikeAppointment = New OutlookLikeAppointment

    occurrence.Start = start

    occurrence.Duration = Me.Duration

    occurrence.RecurrenceRule = Nothing

    occurrence.Summary = Me.Summary

    occurrence.Description = Me.Description

    occurrence.Location = Me.Location

    occurrence.ToolTipText = Me.ToolTipText

    occurrence.Visible = Me.Visible

    occurrence.AllowDelete = Me.AllowDelete

    occurrence.AllowEdit = Me.AllowEdit

    occurrence.ResourceIds = Me.ResourceIds

    occurrence.BackgroundId = Me.BackgroundId

    occurrence.StatusId = Me.StatusId

    occurrence.CultureInfoProvider = Me.CultureInfoProvider

    occurrence.IsViewCalculated = True
     occurrence.MasterEvent = Me


     occurence.Email = Me.Email

    Return occurrence

End Function

Many thanks

Steve

[Dobry Zranchev]

Hello Steve,

Thank you for writing.

You are correct that you are not able to set the MasterEvent of the occurrence. The reason is that the field and the property MasterEvent is called with the same name (field name is 'masterEvent', property name is 'MasterEvent'). VB.Net is not case sensitive and it finds only the property so you are not able to see the field. If you want to set this property, you should to use reflection in order to set the field value.

Public Class CustomAppointment
 inherits Appointment

    ''' <summary>
    ''' ... for repeated occurrences
    ''' </summary>
    ''' <param name="start"></param>
    ''' <returns></returns>
    Public Overrides Function CreateOccurrence(ByVal start As Date) As IEvent
        Dim occurrence As CustomAppointment = New CustomAppointment
        occurrence.Start = start
        occurrence.Duration = Me.Duration
        occurrence.RecurrenceRule = Nothing
        occurrence.Summary = Me.Summary
        occurrence.Description = Me.Description
        occurrence.Location = Me.Location
        occurrence.ToolTipText = Me.ToolTipText
        occurrence.Visible = Me.Visible
        occurrence.AllowDelete = Me.AllowDelete
        occurrence.AllowEdit = Me.AllowEdit

        For each id as EventId in Me.ResourceIds
            occurrence.ResourceIds.Add(id)
        Next

        occurrence.BackgroundId = Me.BackgroundId
        occurrence.StatusId = Me.StatusId
        occurrence.CultureInfoProvider = Me.CultureInfoProvider
        occurrence.IsViewCalculated = True
        dim appType as Type = GetType(Telerik.WinControls.UI.Appointment)
        appType.GetField("masterEvent", system.reflection.bindingFlags.Instance or system.reflection.bindingFlags.NonPublic).SetValue(occurrence, me)
        Return occurrence
    End Function

End Class

In case that you have other related questions, do not hesitate to write back.

All the best,
Dobry Zranchev
the Telerik team

[Timothy]

Is this still relevant?

Dim appType As Type = GetType(Telerik.WinControls.UI.Appointment)
appType.GetField("masterEvent", System.Reflection.BindingFlags.Instance Or System.Reflection.BindingFlags.NonPublic).SetValue(occurrence, Me)

appType.GetField("masterEvent", System.Reflection.BindingFlags.Instance Or System.Reflection.BindingFlags.NonPublic) returns Nothing for me.

Thanks.

[Timothy]

I think I may have figured it out. The Appointment class inherits the Event class which contains masterEvent. So, I substituted Event for Appointment. Is that the correct way to do it now?

Thanks.

[Peter]

Hi Timothy,

Thank you for writing.

I would like to confirm that your approach is correct because the Appointment class inherits the Event class, which contains the MasterEvent property, which is read-only and cannot be set.

Should you have any other questions or suggestions, do not hesitate to contact us.

All the best,
Peter
the Telerik team