XDocument.AddFirst Method (System.Xml.Linq)

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.NET Framework Class Library

XDocument.AddFirst Method

Adds the specified content as the first children of this document or element.

This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.

Overload List

	Name	Description
	AddFirst(Object)	Adds the specified content as the first children of this document or element. (Inherited from XContainer.)
	AddFirst(Object[])	Adds the specified content as the first children of this document or element. (Inherited from XContainer.)

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Remarks

This method adds the new content before the existing content of the XContainer.

For details about the valid content that can be passed to this function, see Valid Content of XElement and XDocument Objects.

This method will raise the Changed and the Changing events.

Examples

The following example creates two XML trees, and then uses this method to add the results of a query to one of them.

XElement srcTree = new XElement("Root",
    new XElement("Element1", 1),
    new XElement("Element2", 2),
    new XElement("Element3", 3),
    new XElement("Element4", 4),
    new XElement("Element5", 5)
);
XElement xmlTree = new XElement("Root",
    new XElement("NewElement", "Content")
);
xmlTree.AddFirst(
    from el in srcTree.Elements()
    where (int)el >= 3
    select el
);
Console.WriteLine(xmlTree);

Visual Basic

Dim srcTree As XElement = _ 
        <Root>
            <Element1>1</Element1>
            <Element2>2</Element2>
            <Element3>3</Element3>
            <Element4>4</Element4>
            <Element5>5</Element5>
        </Root>
Dim xmlTree As XElement = <Root>
                              <NewElement>Content</NewElement>
                          </Root>
xmlTree.AddFirst( _
    From el In srcTree.Elements _
    Where CInt(el) >= 3 _
    Select el)
Console.WriteLine(xmlTree)

This example produces the following output:

xmlLang

<Root>
  <Element3>3</Element3>
  <Element4>4</Element4>
  <Element5>5</Element5>
  <NewElement>Content</NewElement>
</Root>

Reference

XDocument Class

System.Xml.Linq Namespace

Add

RemoveNodes

ReplaceNodes

Other Resources

LINQ to XML