XmlAnyAttributeAttribute Class
 
System_CAPS_noteNote

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Specifies that the member (a field that returns an array of XmlAttribute objects) can contain any XML attributes.

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

SystemObject
   SystemAttribute
    System.Xml.SerializationXmlAnyAttributeAttribute

[AttributeUsageAttribute(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.ReturnValue, 
	AllowMultiple = false)]
public class XmlAnyAttributeAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Property | AttributeTargets::Field | AttributeTargets::Parameter | AttributeTargets::ReturnValue, 
	AllowMultiple = false)]
public ref class XmlAnyAttributeAttribute : Attribute
[<AttributeUsageAttribute(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.ReturnValue,
    AllowMultiple = false)>]
type XmlAnyAttributeAttribute = 
    class
        inherit Attribute
    end
<AttributeUsageAttribute(AttributeTargets.Property Or AttributeTargets.Field Or AttributeTargets.Parameter Or AttributeTargets.ReturnValue,
	AllowMultiple := False)>
Public Class XmlAnyAttributeAttribute
	Inherits Attribute
NameDescription
System_CAPS_pubmethod XmlAnyAttributeAttribute

Constructs a new instance of the XmlAnyAttributeAttribute class.

NameDescription
System_CAPS_pubproperty

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_protmethod Finalize

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_protmethod MemberwiseClone

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

Use the XmlAnyAttributeAttribute to contain arbitrary data (as XML attributes) that is sent as part of an XML document, such as, metadata sent as part of the document.

Apply the XmlAnyAttributeAttribute to a field that returns an array of XmlAttribute or XmlNode objects. When the Deserialize method of the XmlSerializer class is called, all XML attributes that do not have a corresponding member in the class being deserialized are collected in the array. After deserialization, you can iterate through the collection of XmlAttribute items to process the data.

The UnknownNode and UnknownAttribute events of the XmlSerializer do not occur if you apply the XmlAnyAttributeAttribute to a member of a class.

System_CAPS_noteNote

You can use the word XmlAnyAttribute in your code instead of the longer XmlAnyAttributeAttribute.

For more information about using attributes, see Extending Metadata Using Attributes.

The following example collects all unknown attributes into an array of XmlAttribute objects. To try the example, create a file named UnknownAttributes.xml that contains the following XML:

<?xml version="1.0" encoding="utf-8"?>
<Group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
GroupType = 'Technical' GroupNumber = '42' GroupBase = 'Red'>
  <GroupName>MyGroup</GroupName>
</Group>
using System;
using System.IO;
using System.Xml.Serialization;
using System.Xml;

public class Group{
   public string GroupName;
   // The UnknownAttributes array will be used to collect all unknown
   // attributes found when deserializing.
   [XmlAnyAttribute]
    public XmlAttribute[]XAttributes;
}

public class Test{
   static void Main(){
      Test t = new Test();
      // Deserialize the file containing unknown attributes.

      t.DeserializeObject("UnknownAttributes.xml");
   }

   private void DeserializeObject(string filename){
      XmlSerializer ser = new XmlSerializer(typeof(Group));
      // A FileStream is needed to read the XML document.
     FileStream fs = new FileStream(filename, FileMode.Open);
     Group g = (Group) ser.Deserialize(fs);
     fs.Close();
     // Write out the data, including unknown attributes.
     Console.WriteLine(g.GroupName);
     Console.WriteLine("Number of unknown attributes: " + 
     g.XAttributes.Length);
     foreach(XmlAttribute xAtt in g.XAttributes){
     Console.WriteLine(xAtt.Name + ": " + xAtt.InnerXml);
     }
     // Serialize the object again with the attributes added.
     this.SerializeObject("AttributesAdded.xml",g);
   }

   private void SerializeObject(string filename, object g){
      XmlSerializer ser = new XmlSerializer(typeof(Group));
      TextWriter writer = new StreamWriter(filename);
      ser.Serialize(writer, g);
      writer.Close();
   }
}
Imports System
Imports System.IO
Imports System.Xml.Serialization
Imports System.Xml

Public Class Group
   Public GroupName As String 
   ' The UnknownAttributes array will be used to collect all unknown
   ' attributes found when deserializing.
   <XmlAnyAttribute> _
    Public UnknownAttributes()As XmlAttribute
End Class

Public Class Test
   Shared Sub Main()
      Dim t  As Test = New Test()
      ' Deserialize the file containing unknown attributes.
      t.DeserializeObject("UnknownAttributes.xml")
   End Sub

   Private Sub DeserializeObject(filename As String)
      Dim ser As XmlSerializer = New XmlSerializer(GetType(Group))
      ' A FileStream is needed to read the XML document.
     Dim fs As FileStream = New FileStream(filename, FileMode.Open)
     Dim g As Group = CType(ser.Deserialize(fs), Group)
     fs.Close()
     ' Write out the data, including unknown attributes.
     Console.WriteLine(g.GroupName)
     Console.WriteLine("Number of unknown attributes: " & _ 
     g.UnknownAttributes.Length)
     Dim xAtt As XmlAttribute
     for each xAtt in g.UnknownAttributes
        Console.WriteLine(xAtt.Name & ": " & xAtt.InnerXml)
     Next
     ' Serialize the object again with the attributes added.
     Me.SerializeObject("AttributesAdded.xml",g)
   End Sub

   Private Sub SerializeObject(filename As String, g As object)
      Dim ser As XmlSerializer = New XmlSerializer(GetType(Group))
      DIm writer As TextWriter = New StreamWriter(filename)
      ser.Serialize(writer, g)
      writer.Close()
   End Sub
End Class
#using <System.dll>
#using <System.Xml.dll>

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

public ref class Group
{
public:
   String^ GroupName;

   // The UnknownAttributes array will be used to collect all unknown
   // attributes found when deserializing.

   [XmlAnyAttributeAttribute]
   array<XmlAttribute^>^XAttributes;
};

void SerializeObject( String^ filename, Object^ g )
{
   XmlSerializer^ ser = gcnew XmlSerializer( Group::typeid );
   TextWriter^ writer = gcnew StreamWriter( filename );
   ser->Serialize( writer, g );
   writer->Close();
}

void DeserializeObject( String^ filename )
{
   XmlSerializer^ ser = gcnew XmlSerializer( Group::typeid );

   // A FileStream is needed to read the XML document.
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   Group^ g = safe_cast<Group^>(ser->Deserialize( fs ));
   fs->Close();

   // Write out the data, including unknown attributes.
   Console::WriteLine( g->GroupName );
   Console::WriteLine(  "Number of unknown attributes: {0}", g->XAttributes->Length );
   for ( IEnumerator ^ e = g->XAttributes->GetEnumerator(); e->MoveNext();  )
   {
      XmlAttribute^ xAtt = safe_cast<XmlAttribute^>(e->Current);
      Console::WriteLine( "{0}: {1}", xAtt->Name, xAtt->InnerXml );
   }
   SerializeObject( "AttributesAdded.xml", g );
}

int main()
{
   // Deserialize the file containing unknown attributes.
   DeserializeObject(  "UnknownAttributes.xml" );
}
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1

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

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