This example compares the old selection to the new selection and displays information to the end user about what has changed. It then prompts to see if they want to continue with the new selection.
For an overview of how to handle events in Visual Basic or Visual C#, see
Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see
Consuming Events in the
.NET Framework Developer's Guide.
Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinSchedule
Imports System.Diagnostics
Private Sub ultraCalendarInfo1_BeforeSelectedNotesChange(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinSchedule.BeforeSelectedNotesEventArgs) Handles ultraCalendarInfo1.BeforeSelectedNotesChange
'----------------------------------------------------------------------------------------------------
' Description
' BeforeSelectedNotesChange
'
' Fires after one or more Note(s) are selected or deselected.
'
'----------------------------------------------------------------------------------------------------
' If the count of the NewSelectedNotes collection is greater than
' the count of the existing SelectedNotes collection, then new
' Notes have been selected
Dim info As String = String.Empty
If (e.NewSelectedNotes.Count > Me.ultraCalendarInfo1.SelectedNotes.Count) Then
info += "The following Notes have been added to the selection:" + vbCrLf + vbCrLf
If (Me.ultraCalendarInfo1.SelectedNotes.Count > 0) Then
' Iterate the NewSelectedNotes collection and get information on
' each new selection
Dim newNote As Note
For Each newNote In e.NewSelectedNotes
' Iterate the existing selected Notes, and see which ones are new
' to the collection
Dim oldNote As Note
For Each oldNote In Me.ultraCalendarInfo1.SelectedNotes
If (newNote Is oldNote) Then
Exit For
Else
' If the existing Note exists in the SelectedNotes collection,
' then it is not really new to the user, so we won't list it as new.
info += newNote.Description + " ("
info += newNote.Date.ToLongDateString() + ")" + vbCrLf
End If
Next
Next
Else
' The count of the SelectedNotes collection was zero, so we don't
' have to check to see whether they already existed, just list them all
Dim newNote As Note
For Each newNote In e.NewSelectedNotes
' If the existing Note exists in the SelectedNotes collection,
' but not in the NewSelectedNotes collection, it has been deselected
info += newNote.Description + " ("
info += newNote.Date.ToLongDateString() + ")" + vbCrLf
Next
End If
ElseIf (e.NewSelectedNotes.Count > 0) Then
' Otherwise, one or more existing Notes have been deselected
info += "The following Notes have been removed from the selection:" + vbCrLf + vbCrLf
' Iterate the existing SelectedNotes collection and get information on
' each selection that is being removed
Dim oldNote As Note
For Each oldNote In Me.ultraCalendarInfo1.SelectedNotes
' Iterate the existing selected Notes, and see which ones are new
' to the collection
Dim newNote As Note
For Each newNote In e.NewSelectedNotes
If (newNote Is oldNote) Then
Exit For
Else
' If the existing Note exists in the SelectedNotes collection,
' but not in the NewSelectedNotes collection, it has been deselected
info += oldNote.Description + " ("
info += oldNote.Date.ToLongDateString() + ")" + vbCrLf
End If
Next
Next
Else
' The selection has been cleared
info += "The SelectedNotes collection is about to be cleared." + vbCrLf
info += vbCrLf + vbCrLf + "Continue?"
' Display a MessageBox and prompt the end user to make sure they want to continue
Dim result As DialogResult = MessageBox.Show(info, "BeforeSelectedNotesChange", MessageBoxButtons.YesNo)
' If the user does not want to continue, cancel the event
If (result = DialogResult.No) Then e.Cancel = True
End If
End Sub
using System.Diagnostics;
using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinSchedule;
private void ultraCalendarInfo1_BeforeSelectedNotesChange(object sender, Infragistics.Win.UltraWinSchedule.BeforeSelectedNotesEventArgs e)
{
//----------------------------------------------------------------------------------------------------
// Description
// BeforeSelectedNotesChange
//
// Fires after one or more Note(s) are selected or deselected.
//
//----------------------------------------------------------------------------------------------------
// If the count of the NewSelectedNotes collection is greater than
// the count of the existing SelectedNotes collection, then new
// Notes have been selected
string info = string.Empty;
if ( e.NewSelectedNotes.Count > this.ultraCalendarInfo1.SelectedNotes.Count )
{
info += "The following Notes have been added to the selection:" + "\n\n";
if ( this.ultraCalendarInfo1.SelectedNotes.Count > 0 )
{
// Iterate the NewSelectedNotes collection and get information on
// each new selection
foreach( Note newNote in e.NewSelectedNotes )
{
// Iterate the existing selected Notes, and see which ones are new
// to the collection
foreach( Note oldNote in this.ultraCalendarInfo1.SelectedNotes )
{
if ( newNote == oldNote )
continue;
else
{
// If the existing Note exists in the SelectedNotes collection,
// then it is not really new to the user, so we won't list it as new.
info += newNote.Description + " (";
info += newNote.Date.ToLongDateString() + ")" + "\n";
}
}
}
}
else
{
// The count of the SelectedNotes collection was zero, so we don't
// have to check to see whether they already existed, just list them all
foreach( Note newNote in e.NewSelectedNotes )
{
info += newNote.Description + " (";
info += newNote.Date.ToLongDateString() + ")" + "\n";
}
}
}
else
if ( e.NewSelectedNotes.Count > 0 )
{
// Otherwise, one or more existing Notes have been deselected
info += "The following Notes have been removed from the selection:" + "\n\n";
// Iterate the existing SelectedNotes collection and get information on
// each selection that is being removed
foreach( Note oldNote in this.ultraCalendarInfo1.SelectedNotes )
{
// Iterate the existing selected Notes, and see which ones are new
// to the collection
foreach( Note newNote in e.NewSelectedNotes )
{
if ( newNote == oldNote )
continue;
else
{
// If the existing Note exists in the SelectedNotes collection,
// but not in the NewSelectedNotes collection, it has been deselected
info += newNote.Description + " (";
info += newNote.Date.ToLongDateString() + ")" + "\n";
}
}
}
}
else
{
// The selection has been cleared
info += "The SelectedNotes collection is about to be cleared." + "\n";
}
info += "\n\n" + "Continue?";
// Display a MessageBox and prompt the end user to make sure they want to continue
DialogResult result = MessageBox.Show( info, "BeforeSelectedNotesChange", MessageBoxButtons.YesNo );
// If the user does not want to continue, cancel the event
if ( result == DialogResult.No )
e.Cancel = true;
}
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
