Converting XDocument to XmlDocument and vice versa

Question

It s a very simple problem that I have  I use XDocument to generate an XML file  I then want to return it as a XmlDocument class  And I have an XmlDocument variable which I need to convert back to XDocument to append more nodes   So  what is the most efficient method to convert XML between XDocument and XmlDocument   Without using any temporary storage in a file

User · Answer

For me this single line solution works very well  XDocument y   XDocument Parse pXmldoc OuterXml      where pXmldoc is of type XMLDocument

User · Answer

If you need a Win 10 UWP compatible variant   using DomXmlDocument   Windows Data Xml Dom XmlDocument       public static class DocumentExtensions               public static XmlDocument ToXmlDocument this XDocument xDocument                        var xmlDocument   new XmlDocument                using  var xmlReader   xDocument CreateReader                                  xmlDocument Load xmlReader                             return xmlDocument                     public static DomXmlDocument ToDomXmlDocument this XDocument xDocument                        var xmlDocument   new DomXmlDocument                using  var xmlReader   xDocument CreateReader                                  xmlDocument LoadXml xmlReader ReadOuterXml                               return xmlDocument                     public static XDocument ToXDocument this XmlDocument xmlDocument                        using  var memStream   new MemoryStream                                  using  var w   XmlWriter Create memStream                                         xmlDocument WriteContentTo w                                     memStream Seek 0  SeekOrigin Begin                   using  var r   XmlReader Create memStream                                         return XDocument Load r                                                      public static XDocument ToXDocument this DomXmlDocument xmlDocument                        using  var memStream   new MemoryStream                                  using  var w   XmlWriter Create memStream                                         w WriteRaw xmlDocument GetXml                                       memStream Seek 0  SeekOrigin Begin                   using  var r   XmlReader Create memStream                                         return XDocument Load r

User · Answer

If you need to convert the instance of System Xml Linq XDocument into the instance of the System Xml XmlDocument this extension method will help you to do not lose the XML declaration in the resulting XmlDocument instance   using System Xml   using System Xml Linq   namespace www dimaka com        internal static class LinqHelper                 public static XmlDocument ToXmlDocument this XDocument xDocument                          var xmlDocument   new XmlDocument                 using  var reader   xDocument CreateReader                                    xmlDocument Load reader                               var xDeclaration   xDocument Declaration               if  xDeclaration    null                                  var xmlDeclaration   xmlDocument CreateXmlDeclaration                       xDeclaration Version                       xDeclaration Encoding                       xDeclaration Standalone                    xmlDocument InsertBefore xmlDeclaration  xmlDocument FirstChild                               return xmlDocument                         Hope that helps

User · Answer

You can use the built in xDocument CreateReader   and an XmlNodeReader to convert back and forth   Putting that into an Extension method to make it easier to work with   using System  using System Xml  using System Xml Linq   namespace MyTest       internal class Program               private static void Main string   args                         var xmlDocument   new XmlDocument                xmlDocument LoadXml   lt Root gt  lt Child gt Test lt  Child gt  lt  Root gt                  var xDocument   xmlDocument ToXDocument                var newXmlDocument   xDocument ToXmlDocument                Console ReadLine                         public static class DocumentExtensions               public static XmlDocument ToXmlDocument this XDocument xDocument                        var xmlDocument   new XmlDocument                using var xmlReader   xDocument CreateReader                                  xmlDocument Load xmlReader                             return xmlDocument                     public static XDocument ToXDocument this XmlDocument xmlDocument                        using  var nodeReader   new XmlNodeReader xmlDocument                                 nodeReader MoveToContent                    return XDocument Load nodeReader                                     Sources    http   msdn microsoft com en-us library bb356384 aspx http   geekswithblogs net aspringer archive 2009 07 01 xdocument-extension aspx

User · Answer

There is a discussion on http   blogs msdn com marcelolr archive 2009 03 13 fast-way-to-convert-xmldocument-into-xdocument aspx  It seems that reading an XDocument via an XmlNodeReader is the fastest method  See the blog for more details

User · Answer

You could try writing the XDocument to an XmlWriter piped to an XmlReader for an XmlDocument   If I understand the concepts properly  a direct conversion is not possible  the internal structure is different   simplified with XDocument   But then  I might be wrong

[c#] Converting XDocument to XmlDocument and vice versa

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