XObject::Changing Event


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Raised when this XObject or any of its descendants are about to change.

Namespace:   System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)

event EventHandler<XObjectChangeEventArgs^>^ Changing {
	void add(EventHandler<XObjectChangeEventArgs^>^ value);
	void remove(EventHandler<XObjectChangeEventArgs^>^ value);

Events are raised only from modification of an XML tree, not from construction of an XML tree. You have to add an event handler to an event before you can receive events, and you can't add an event handler before you have a reference to an XObject. You can't get a reference to an XObject before the XML tree is constructed. This means that during functional construction of an XML tree, you will not receive events.

You should be careful when modifying an XML tree within one of these events, because doing this might lead to unexpected results. For example, if you receive a Changing event, and while the event is being processed you remove the node from the tree, you might not receive the Changed event. When an event is being processed, it is valid to modify an XML tree other than the one that contains the node that is receiving the event; it is even valid to modify the same tree provided the modifications do not affect the specific nodes on which the event was raised. However, if you modify the area of the tree that contains the node receiving the event, the events that you receive and the impact to the tree are undefined.

The following example adds an event handler to the root element of an XML tree. It then modifies the tree, causing LINQ to XML to raise some events.

No code example is currently available or this language may not be supported.

This example produces the following output:

                Changing event raised
  Sender: Child
  ObjectChange: Add
Changed event raised
  Sender: Child
  ObjectChange: Add

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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