PropertyChanged Event

Summary

Notifies clients that a property value has changed.

Syntax
C#
VB
C++
public event PropertyChangedEventHandler PropertyChanged 
  
Public Event PropertyChanged As PropertyChangedEventHandler 
public: 
event PropertyChangedEventHandler^ PropertyChanged 

Event Data

The event handler receives an argument of type PropertyChangedEventArgs containing data related to this event. The following PropertyChangedEventArgs properties provide information specific to this event.

PropertyDescription
PropertyName Gets the name of the property that changed.

Remarks

The PropertyChanged event can indicate all properties on the object have changed by using either a null reference (Nothing in VB) or String.Empty as the property name in the System.ComponentModel.PropertyChangedEventArgs.

Example

This example handles the PropertyChanged event.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Web.Controls; 
 
public void WebImageViewer_PropertyChanged(WebThumbnailViewer webThumbnailViewer) 
{ 
   webThumbnailViewer.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(webThumbnailViewer_PropertyChanged); 
} 
 
void webThumbnailViewer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) 
{ 
   if (e.PropertyName == "SelectedIndex") 
   { 
      // SelectedIndex property changed. 
   } 
   else if (e.PropertyName == "Rows") 
   { 
      // Rows property changed. 
   } 
   // 
   //etc. 
   // 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Web.Controls 
 
Public Sub WebImageViewer_PropertyChanged(ByVal webThumbnailViewer As WebThumbnailViewer) 
 
   AddHandler webThumbnailViewer.PropertyChanged, New System.ComponentModel.PropertyChangedEventHandler(AddressOf webThumbnailViewer_PropertyChanged) 
End Sub 
 
Sub webThumbnailViewer_PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) 
 
   If (e.PropertyName = "SelectedIndex") Then 
 
      ' SelectedIndex property changed. 
 
   ElseIf (e.PropertyName = "Rows") Then 
      ' Rows property changed. 
 
      ' 
      'etc. 
      ' 
   End If 
End Sub 

Requirements

Target Platforms

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