ObjectBase.OnPropertyChanging Method

[This is preliminary documentation and subject to change.]

Called when a property of the object is about to be changed.

[Visual Basic]
Protected Sub OnPropertyChanging( _
   ByVal propertyName As String, _
   ByVal oldValue As Object, _
   ByVal newValue As Object _
)

[C#]
protected void OnPropertyChanging(
   string propertyName,
   object oldValue,
   object newValue
);

Parameters

propertyName: The name of the property.
oldValue: The old property value.
newValue: The new property value.

Remarks

The implementation creates and caches a new PropertyChangeEventArgs instance and dispatches the event by means of calling the PropagateChangingEvent method. The corresponding 'changed' event should be raised by calling the OnPropertyChanged method after the property's value has been changed. In other word, calls to OnPropertyChanging and OnPropertyChanged method should always be balanced.

ObjectBase.OnPropertyChanging Method

Parameters

Remarks

See Also