Re: LINQ to XML to Find Escaped Ampersand Problems?

SnapDive <SnapDive@community.nospam>
Tue, 09 Jun 2009 10:39:33 -0400
Thanks, I will try that. I now have an issue related to memory usage.
I had success with small documents, but a multimegabyte document
breaks with an OutOfMemoryException. If the document looks like this:

<?xml version="1.0" encoding="utf-8"?>
  <![CDATA[ ]]>
  <![CDATA[ ]]>

Is there some way to use an XmlReader to read in each "subpart"
element into a document and give that to an XDocument instance so I
can do the query? Would that save memory?


On Tue, 09 Jun 2009 09:35:10 GMT,
(Lingzhi Sun [MSFT]) wrote:

Hi SnapDive,

Welcome to Microsoft MSDN newsgroup. My name is Lingzhi Sun [MSFT]. It is
my pleasure to work with you on this LINQ to XML question.

In LINQ to XML, the CDATA is represented by XCData
( and
the XML element?s inner text is expressed by XText
( We
can use the XElement.DescendantNodesAndSelf
nodesandself.aspx) method to get all the XML nodes in an XML document.
Here are some code examples for your references:

Check the CDATA and Replace the value if necessary
XDocument doc = XDocument.Load("MyXml.xml");

var query = from element in doc.Root.DescendantNodesAndSelf()
           where element.NodeType == System.Xml.XmlNodeType.CDATA
           let CDataElement = element as XCData
           where CDataElement.Value.Contains("&amp;")
           select CDataElement;

foreach (var element in query)
   element.Value = element.Value.Replace("&amp;", "&");



Check the Inner Text and Replace the value if necessary
XDocument doc = XDocument.Load("MyXml.xml");

var query = from element in doc.Root.DescendantNodesAndSelf()
           where element.NodeType == System.Xml.XmlNodeType.Text
           let TextElement = element as XText
           where TextElement.Value.Contains("&&")
           select TextElement;

foreach (var element in query)
   element.Value = element.Value.Replace("&&", "&");


If you can use VB.NET on this LINQ to XML case, you can also consider using
the new VB.NET feature, XML literals to query the XML document. For
detail, please see &

Please note: if there is a namespace in your XML document, please refer to
Working with XML Namespace
( You may need to
do some modification on my code snippets to query the XML elements with

If you have any questions regarding this case, please feel free to let me

Lingzhi Sun
Microsoft Online Community Support

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