Export (0) Print
Expand All

Extensions.Elements<T> Method (IEnumerable<T>)

Returns a collection of the child elements of every element and document in the source collection.

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

public static IEnumerable<XElement> Elements<T>(
	this IEnumerable<T> source
)
where T : XContainer

Type Parameters

T

The type of the objects in source, constrained to XContainer.

Parameters

source
Type: System.Collections.Generic.IEnumerable<T>
An IEnumerable<T> of XElement that contains the source collection.

Return Value

Type: System.Collections.Generic.IEnumerable<XElement>
An IEnumerable<T> of XElement of the child elements of every element or document in the source collection.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<T>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Although Visual Basic contains an integrated elements axis that allows you to find all child elements with a specified XName for every element in the source collection, there is no integrated elements axis that allows you to retrieve a collection of every child element for every element in the source collection.

This method uses deferred execution.

The following example retrieves a collection of elements with the element name of Child. It then uses this axis method to retrieve all child elements of the collection.

XElement xmlTree = new XElement("Root",
    new XElement("Child",
        new XElement("GrandChild1", 1),
        new XElement("GrandChild2", 2)
    ),
    new XElement("Child",
        new XElement("GrandChild3", 3),
        new XElement("GrandChild4", 4)
    ),
    new XElement("Child",
        new XElement("GrandChild5", 5),
        new XElement("GrandChild6", 6)
    )
);

IEnumerable<XElement> allGrandChildren =
    from el in xmlTree.Elements("Child").Elements()
    select el;

foreach (XElement el in allGrandChildren)
    Console.WriteLine(el);

This example produces the following output:

<GrandChild1>1</GrandChild1>
<GrandChild2>2</GrandChild2>
<GrandChild3>3</GrandChild3>
<GrandChild4>4</GrandChild4>
<GrandChild5>5</GrandChild5>
<GrandChild6>6</GrandChild6>

The following is the same example, but in this case the XML is in a namespace. For more information, see Working with XML Namespaces.

XNamespace aw = "http://www.adventure-works.com";
XElement xmlTree = new XElement(aw + "Root",
    new XElement(aw + "Child",
        new XElement(aw + "GrandChild1", 1),
        new XElement(aw + "GrandChild2", 2)
    ),
    new XElement(aw + "Child",
        new XElement(aw + "GrandChild3", 3),
        new XElement(aw + "GrandChild4", 4)
    ),
    new XElement(aw + "Child",
        new XElement(aw + "GrandChild5", 5),
        new XElement(aw + "GrandChild6", 6)
    )
);

IEnumerable<XElement> allGrandChildren =
    from el in xmlTree.Elements(aw + "Child").Elements()
    select el;

foreach (XElement el in allGrandChildren)
    Console.WriteLine(el);

This example produces the following output:

<GrandChild1 xmlns="http://www.adventure-works.com">1</GrandChild1>
<GrandChild2 xmlns="http://www.adventure-works.com">2</GrandChild2>
<GrandChild3 xmlns="http://www.adventure-works.com">3</GrandChild3>
<GrandChild4 xmlns="http://www.adventure-works.com">4</GrandChild4>
<GrandChild5 xmlns="http://www.adventure-works.com">5</GrandChild5>
<GrandChild6 xmlns="http://www.adventure-works.com">6</GrandChild6>

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Community Additions

ADD
Show:
© 2014 Microsoft