Export (0) Print
Expand All

XDocument.Parse Method (String, LoadOptions)

Creates a new XDocument from a string, optionally preserving white space, setting the base URI, and retaining line information.

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

'Declaration
Public Shared Function Parse ( _
	text As String, _
	options As LoadOptions _
) As XDocument

Parameters

text
Type: System.String

A string that contains XML.

options
Type: System.Xml.Linq.LoadOptions

A LoadOptions that specifies white space behavior, and whether to load base URI and line information.

Return Value

Type: System.Xml.Linq.XDocument
An XDocument populated from the string that contains XML.

If the source XML is indented, setting the PreserveWhitespace flag in options causes the reader to read all white space in the source XML. Nodes of type XText are created for both significant and insignificant white space.

If the source XML is indented, not setting the PreserveWhitespace flag in options causes the reader to ignore all of the insignificant white space in the source XML. The XML tree is created without any text nodes for insignificant white space.

If the source XML is not indented, setting the PreserveWhitespace flag in options has no effect. Significant white space is still preserved, and there are no spans of insignificant white space that could cause the creation of more white space text nodes.

For more information, see Preserving White Space while Loading or Parsing XML and Preserving White Space While Serializing.

Setting SetBaseUri is not valid when parsing from a String.

There is a performance penalty if you set the SetLineInfo flag.

The line information is accurate immediately after loading the XML document. If you modify the XML tree after loading the document, the line information may become meaningless.

LINQ to XML's loading functionality is built upon XmlReader. Therefore, you might catch any exceptions that are thrown by the XmlReader.Create overload methods and the XmlReader methods that read and parse the document.

The following example parses a string into an XDocument.

Dim str As String = _
"<?xml version= '1.0'?>" & Environment.NewLine & _
"<!-- comment at the root level -->" & Environment.NewLine & _
"<Root>" & Environment.NewLine & _
"    <Child>Content</Child>"  & Environment.NewLine & _
"</Root>"

Dim doc1 As XDocument = XDocument.Parse(str, LoadOptions.PreserveWhitespace)
Console.WriteLine("nodes when preserving whitespace: {0}", doc1.DescendantNodes().Count())
Dim doc2 As XDocument = XDocument.Parse(str, LoadOptions.None)
Console.WriteLine("nodes when not preserving whitespace: {0}", doc2.DescendantNodes().Count())

This example produces the following output:

nodes when preserving whitespace: 8
nodes when not preserving whitespace: 4

.NET Framework

Supported in: 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Show:
© 2014 Microsoft