DeleteRecurringAppointmentDialog

The DeleteRecurringAppointmentDialog is shown when you try to delete a recurring appointment.

Figure 1. DeleteRecurringAppointmentDialog

It will pop up when you press the Delete key while a recurring appointment is selected. Alternatively, you can show it by pressing the Delete button in the EditAppointmentDialog while editing a single occurrence.

Figure 2. Delete button in the EditAppointmentDialog

Create a custom DeleteRecurringAppointmentDialog

You can extend the default DeleteRecurringAppointmentDialog and add custom fields or replace some of the existing ones. Alternatively, you can create a completely new dialog according to any specific requirements. For this purpose, it is necessary to create a class that inherits RadSchedulerDialog and implements the IDeleteRecurringAppointmentDialog interface. The IDeleteRecurringAppointmentDialog interface requires implementing the following methods and properties:

• DialogResult ShowDialog()
• string EventName
• bool DeleteSeries
• string ThemeName

As a derivative of RadSchedulerDialog which inherits RadForm, the ShowDialog method and the ThemeName property are already available. It is left to implement the EventName and DeleteSeries properties.

In the following example, we will create a derivative of the DeleteRecurringAppointmentDialog which contains RadDropDownList instead of two RadRadioButton controls for choosing to delete the occurrence/series.

Figure 3. Custom DeleteRecurringAppointmentDialog

public partial class CustomDeleteRecurringAppointmentDialog : DeleteRecurringAppointmentDialog
{
    Telerik.WinControls.UI.Localization.RadSchedulerLocalizationProvider localizationProvider;
    RadDropDownList deleteSelection;
    public CustomDeleteRecurringAppointmentDialog()
    {
        InitializeComponent();
        this.Text = localizationProvider.GetLocalizedString(Telerik.WinControls.UI.Localization.RadSchedulerStringId.DeleteRecurrenceDialogTitle);
    }
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        this.radioDeleteOccurrence.Visible = false;
        this.radioDeleteSeries.Visible = false;
        if (deleteSelection == null)
        {
            deleteSelection = new RadDropDownList();
            deleteSelection.Width = 150;
            this.Controls.Add(deleteSelection);
            deleteSelection.Items.Add(this.radioDeleteOccurrence.Text);
            deleteSelection.Items.Add(this.radioDeleteSeries.Text);
            deleteSelection.SelectedIndex = 0;
            deleteSelection.Location = this.radioDeleteOccurrence.Location;
        }
    }
    public override bool DeleteSeries
    {
        get
        {
            return this.deleteSelection.SelectedIndex == 1;
        }
    }
    protected override void LocalizeDialog(Telerik.WinControls.UI.Localization.RadSchedulerLocalizationProvider localizationProvider)
    {
        base.LocalizeDialog(localizationProvider);
        this.localizationProvider = localizationProvider;
    }
}

Partial Public Class CustomDeleteRecurringAppointmentDialog
    Inherits DeleteRecurringAppointmentDialog
    Private localizationProvider As Telerik.WinControls.UI.Localization.RadSchedulerLocalizationProvider
    Private deleteSelection As RadDropDownList
    Public Sub New()
        InitializeComponent()
        Me.Text = localizationProvider.GetLocalizedString(Telerik.WinControls.UI.Localization.RadSchedulerStringId.DeleteRecurrenceDialogTitle)
    End Sub
    Protected Overrides Sub OnLoad(ByVal e As EventArgs)
        MyBase.OnLoad(e)
        Me.radioDeleteOccurrence.Visible = False
        Me.radioDeleteSeries.Visible = False
        If deleteSelection Is Nothing Then
            deleteSelection = New RadDropDownList()
            deleteSelection.Width = 150
            Me.Controls.Add(deleteSelection)
            deleteSelection.Items.Add(Me.radioDeleteOccurrence.Text)
            deleteSelection.Items.Add(Me.radioDeleteSeries.Text)
            deleteSelection.SelectedIndex = 0
            deleteSelection.Location = Me.radioDeleteOccurrence.Location
        End If
    End Sub
    Public Overrides ReadOnly Property DeleteSeries As Boolean
        Get
            Return Me.deleteSelection.SelectedIndex = 1
        End Get
    End Property
    Protected Overrides Sub LocalizeDialog(ByVal localizationProvider As Telerik.WinControls.UI.Localization.RadSchedulerLocalizationProvider)
        MyBase.LocalizeDialog(localizationProvider)
        Me.localizationProvider = localizationProvider
    End Sub
End Class

Now, you can replace the default DeleteRecurringAppointmentDialog with the custom one by using the RadScheduler.RecurrenceDeleteDialogShowing event:

CustomDeleteRecurringAppointmentDialog myDialog;

private void radScheduler1_RecurrenceDeleteDialogShowing(object sender, RecurrenceDeleteDialogShowingEventArgs e)
{
    if (myDialog == null)
    {
        myDialog = new CustomDeleteRecurringAppointmentDialog();
    }
    myDialog.EventName = e.Appointment.Summary;
    e.DeleteDialog = myDialog;
}

Private myDialog As CustomDeleteRecurringAppointmentDialog
Private Sub RadScheduler1_RecurrenceDeleteDialogShowing(sender As Object, e As Telerik.WinControls.UI.RecurrenceDeleteDialogShowingEventArgs)
    If myDialog Is Nothing Then
        myDialog = New CustomDeleteRecurringAppointmentDialog()
    End If
    myDialog.EventName = e.Appointment.Summary
    e.DeleteDialog = myDialog
End Sub