Extensions.Attributes Method (IEnumerable<XElement>)

 

Returns a collection of the attributes of every element in the source collection.

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

public static IEnumerable<XAttribute> Attributes(
	this IEnumerable<XElement> source
)

Parameters

source
Type: System.Collections.Generic.IEnumerable<XElement>

An IEnumerable<T> of XElement that contains the source collection.

Return Value

Type: System.Collections.Generic.IEnumerable<XAttribute>

An IEnumerable<T> of XAttribute that contains the attributes of every element in the source collection.

Note that unlike some other XML programming interfaces, in LINQ to XML, namespaces are surfaced as attributes.

Although Visual Basic users can use the integrated attribute axis to retrieve attributes with a specified name from a collection of elements, there is no integrated Visual Basic axis to retrieve all attributes of all elements in a collection.

This method uses deferred execution.

The following example retrieves a collection of elements, and then retrieves a collection of all attributes of all elements in the collection. Note that the resulting collection includes only the attributes of the Child1 and Child2 elements, and not the attributes of the Root element.

Note that the namespace attribute is returned by this method.


                XElement xmlTree = new XElement("Root",
    new XAttribute(XNamespace.Xmlns + "aw", "http://www.adventure-works.com"),
    new XAttribute("Att1", "content1"),
    new XAttribute("Att2", "content2"),
    new XElement("Child1",
        new XAttribute("Att1", "content3"),
        new XAttribute("Att2", "content4")
    ),
    new XElement("Child2",
        new XAttribute("Att1", "content5"),
        new XAttribute("Att2", "content6")
    )
);
Console.WriteLine(xmlTree);
Console.WriteLine("-----");

IEnumerable<XAttribute> attList =
    from att in xmlTree.DescendantsAndSelf().Attributes()
    select att;

foreach (XAttribute att in attList)
    Console.WriteLine(att);

This example produces the following output:

<Root xmlns:aw="http://www.adventure-works.com" Att1="content1" Att2="content2">
  <Child1 Att1="content3" Att2="content4" />
  <Child2 Att1="content5" Att2="content6" />
</Root>
-----
xmlns:aw="http://www.adventure-works.com"
Att1="content1"
Att2="content2"
Att1="content3"
Att2="content4"
Att1="content5"
Att2="content6"

The following is the same example, but in this case the XML is in a namespace. For more information, see Working with XML Namespaces. Note that the namespace attribute is included in the returned collection.


                XNamespace aw = "http://www.adventure-works.com";
XElement xmlTree = new XElement(aw + "Root",
    new XAttribute(XNamespace.Xmlns + "aw", "http://www.adventure-works.com"),
    new XAttribute(aw + "Att1", "content1"),
    new XAttribute(aw + "Att2", "content2"),
    new XElement(aw + "Child1",
        new XAttribute(aw + "Att1", "content3"),
        new XAttribute(aw + "Att2", "content4")
    ),
    new XElement(aw + "Child2",
        new XAttribute(aw + "Att1", "content5"),
        new XAttribute(aw + "Att2", "content6")
    )
);
Console.WriteLine(xmlTree);
Console.WriteLine("-----");

IEnumerable<XAttribute> attList =
    from att in xmlTree.DescendantsAndSelf().Attributes()
    select att;

foreach (XAttribute att in attList)
    Console.WriteLine(att);

This example produces the following output:

<aw:Root xmlns:aw="http://www.adventure-works.com" aw:Att1="content1" aw:Att2="content2">
  <aw:Child1 aw:Att1="content3" aw:Att2="content4" />
  <aw:Child2 aw:Att1="content5" aw:Att2="content6" />
</aw:Root>
-----
xmlns:aw="http://www.adventure-works.com"
aw:Att1="content1"
aw:Att2="content2"
aw:Att1="content3"
aw:Att2="content4"
aw:Att1="content5"
aw:Att2="content6"

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