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XmlAnyElementAttributes Class

Represents a collection of XmlAnyElementAttribute objects.

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

public class XmlAnyElementAttributes : CollectionBase

Use the XmlAnyElementAttributes to override the behavior of a set of XmlAnyElementAttribute objects. Multiple instances of the XmlAnyElementAttribute class can be applied to a class member, as long as each instance has a distinct Name property value; this instructs the XmlSerializer to collect unknown elements under the named element into the appropriate array. It is for this reason that multiple instances of the XmlAnyElementAttribute class can be added to the XmlAnyElementAttributes.

To override a set of XmlAnyElementAttribute objects:

  1. Create an XmlAnyElementAttributes.

  2. Create the set of XmlAnyElementAttribute objects, and add each object to the collection using the Add method.

  3. Create an XmlAttributes.

  4. Set the XmlAnyElements property to the XmlAnyElementAttributes.

  5. Create an XmlAttributeOverrides.

  6. Add the XmlAttributes to the XmlAttributeOverrides using the Add method.

  7. Create an instance of the XmlSerializer using the XmlAttributeOverrides.

  8. Serialize or deserialize an object that contains the set of XmlAnyElementAttribute objects.

The following example creates a new XmlAnyElementAttribute and adds it to the collection of objects accessed through the XmlAnyElements property. The XmlAttributes is then added to a XmlAttributeOverrides which is used to create an XmlSerializer. The XmlSerializer is used to serialize or deserialize an object. To see the effect of using the XmlAnyElementAttributes property, create an XML document named UnknownElements.xml by running the SerializeObject method in the Main method. Edit the resulting document to include other (unknown) elements. Comment out the SerializeObject call in the Main method, and uncomment the call to the DeserializeObject method, which prints out the name and value of any unknown XML element.

using System;
using System.IO;
using System.Xml.Serialization;
using System.Xml;

public class Group{
   public string GroupName;
   public object[]Things;


public class Test{
   static void Main(){
      Test t = new Test();
      // 1 Run this and create the XML document. 
      // 2 Add new elements to the XML document. 
      // 3 Comment out the new line, and uncomment 
      // the DeserializeObject line to deserialize the 
      // XML document and see unknown elements.

      // t.DeserializeObject("UnknownElements.xml");

   private void SerializeObject(string filename){
      XmlSerializer ser = new XmlSerializer(typeof (Group));
      TextWriter writer = new StreamWriter(filename);
      Group g = new Group();
      g.GroupName = "MyGroup";
      ser.Serialize(writer, g);

   private void DeserializeObject(string filename){

      XmlSerializer ser = CreateOverrideSerializer();
      // A FileStream is needed to read the XML document.
      FileStream fs = new FileStream(filename, FileMode.Open);
     Group g = (Group)
     foreach(XmlElement xelement in g.Things){
     Console.WriteLine(xelement.Name + ": " + xelement.InnerXml);

   private XmlSerializer CreateOverrideSerializer(){
      XmlAnyElementAttribute myAnyElement = 
      new XmlAnyElementAttribute();
      XmlAttributeOverrides xOverride = 
      new XmlAttributeOverrides();
      XmlAttributes xAtts = new XmlAttributes();
      xOverride.Add(typeof(Group), "Things", xAtts);
      return new XmlSerializer(typeof(Group) , xOverride);
#using <mscorlib.dll>
#using <System.dll>
#using <System.xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml::Serialization;
using namespace System::Xml;

public __gc class Group
   String* GroupName;

   Object* Things[];


void SerializeObject(String* filename);
void DeserializeObject(String* filename);
XmlSerializer* CreateOverrideSerializer();

int main()
   // 1 Run this and create the XML document.
   // 2 Add new elements to the XML document.
   // 3 Comment out the next line, and uncomment
   // the DeserializeObject line to deserialize the
   // XML document and see unknown elements.

   // DeserializeObject(S"UnknownElements.xml");

void SerializeObject(String* filename)
   XmlSerializer* ser = new XmlSerializer( __typeof(Group));
   TextWriter* writer = new StreamWriter(filename);
   Group* g = new Group();
   g->GroupName = S"MyGroup";
   ser->Serialize(writer, g);

void DeserializeObject(String* filename)

   XmlSerializer* ser = CreateOverrideSerializer();
   // A FileStream is needed to read the XML document.
   FileStream* fs = new FileStream(filename, FileMode::Open);
   Group* g = __try_cast<Group*>( ser->Deserialize(fs ));
   for ( int i = 0; i < g->Things->Length; ++i )
      XmlElement* xelement = __try_cast<XmlElement*>( g->Things[i] );
      Console::WriteLine( S"{0}: {1}", xelement->Name, xelement->InnerXml );

XmlSerializer* CreateOverrideSerializer()
   XmlAnyElementAttribute* myAnyElement = new XmlAnyElementAttribute();
   XmlAttributeOverrides* xOverride = new XmlAttributeOverrides();
   XmlAttributes* xAtts = new XmlAttributes();
   xOverride->Add(__typeof(Group), S"Things", xAtts);
   return new XmlSerializer(__typeof(Group) , xOverride);


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0