Sets the value of a child element, adds a child element, or removes a child element.
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)
This method is designed to make it easy to maintain a list of name/value pairs as a set of children elements. When maintaining the list, you need to add pairs, modify pairs, or delete pairs. If you call this method passing a name that does not exist as a child element, this method creates a child element for you. If you call this method passing the name of an existing child element, this method modifies the value of the child element to the value that you specify. If you pass nullptr for value, this method removes the child element.
This method will raise events.
The value is assigned to the first child element with the specified name. If no child element with the specified name exists, a new child element is added. If the value is null, the first child element with the specified name, if any, is deleted.
This method does not add child nodes or attributes to the specified child element. This method throws an exception if any object that derives from XObject is passed as value.
For more information, see Maintaining Name/Value Pairs.
The following example creates an element with a child element. It then uses this method to set the value of the child element.
This example produces the following output:
<Root> <Ele1>1</Ele1> <Ele2>2</Ele2> <Ele3>3</Ele3> </Root> <Root> <Ele1>1</Ele1> <Ele2>22</Ele2> <Ele3>3</Ele3> </Root> <Root> <Ele1>1</Ele1> <Ele2>22</Ele2> </Root>
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.