PropertyChanged Event
Summary
Notifies clients that a property value has changed.
Syntax
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.
| Property | Description |
|---|
| PropertyName | Gets the name of the property that changed. |
Example
This example handles the PropertyChanged event.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Web.Controls;
using Leadtools.ImageProcessing;
public void WebImageViewer_PropertyChanged()
{
WebImageViewer mainWebImageViewer = new WebImageViewer();
mainWebImageViewer.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(mainWebImageViewer_PropertyChanged);
//
// update some properties values
//
mainWebImageViewer.PropertyChanged -= new System.ComponentModel.PropertyChangedEventHandler(mainWebImageViewer_PropertyChanged);
}
void mainWebImageViewer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "ScaleFactor")
{
// ScaleFactor property changed.
}
else if (e.PropertyName == "SizeMode")
{
// SizeMode property changed.
}
//
//etc.
//
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.Web.Controls
Public Sub WebImageViewer_PropertyChanged()
Dim mainWebImageViewer As WebImageViewer = New WebImageViewer()
AddHandler mainWebImageViewer.PropertyChanged, New System.ComponentModel.PropertyChangedEventHandler(AddressOf mainWebImageViewer_PropertyChanged)
''
'' update some properties values
''
AddHandler mainWebImageViewer.PropertyChanged, New System.ComponentModel.PropertyChangedEventHandler(AddressOf mainWebImageViewer_PropertyChanged)
End Sub
Sub mainWebImageViewer_PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs)
If (e.PropertyName = "ScaleFactor") Then
'' ScaleFactor property changed.
ElseIf (e.PropertyName = "SizeMode") Then
'' SizeMode property changed.
''
''etc.
''
End If
End Sub
