Extensions.Attributes Method (IEnumerable<XElement>)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Returns a collection of the attributes of every element in the source collection.
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)
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.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<XElement>. When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source is null. |
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.
StringBuilder output = new StringBuilder(); 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") ) ); output.Append(xmlTree + Environment.NewLine); output.Append("-----" + Environment.NewLine); IEnumerable<XAttribute> attList = from att in xmlTree.DescendantsAndSelf().Attributes() select att; foreach (XAttribute att in attList) output.Append(att + Environment.NewLine); OutputTextBlock.Text = output.ToString();