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ServiceBehaviorAttribute.IgnoreExtensionDataObject Property

Gets or sets a value that specifies whether to send unknown serialization data onto the wire.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

public bool IgnoreExtensionDataObject { get; set; }

Property Value

Type: System.Boolean
true if unknown serialization data is never sent; otherwise, false. The default is false.

If a type implements the IExtensibleDataObject interface, it stores any extra data it doesn’t know about that comes over the wire when deserializing into that type. For example, if a type Person has members FirstName and LastName, and an element called PhoneNumber comes in, it is stored. When later serializing the type, PhoneNumber will be re-emitted. The problem is that the schema for Person exported by that service only has FirstName and LastName, so generates a schema-invalid instance! If strict schema compliance is important, you can set IgnoreExtensionDataObject to true to turn this re-emitting behavior off.

Regardless IgnoreExtensionDataObject setting, always processes known data (both in and out) and does not throw exceptions when extra data comes in. You can also set this property using the <dataContractSerializer> element in an application configuration file.

The following example shows the use of IgnoreExtensionDataObject and an implementation of IExtensibleDataObject. In this sample, with IgnoreExtensionDataObject set to false, the extra data that the client knows about is round-tripped back to the client.

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Xml;

namespace Microsoft.WCF.Documentation
  [ServiceContract(Namespace = "http://microsoft.wcf.documentation")]
  public interface ISampleService{
    Person SampleMethod(Person personParam);

  [DataContract(Name="OriginalPerson", Namespace="http://microsoft.wcf.documentation")]
  public class Person : IExtensibleDataObject
    public string firstName;
    public string lastName;
    public string Message;
    public XmlNode[] Blob;

    #region IExtensibleDataObject Members
    private ExtensionDataObject data = null;

    public ExtensionDataObject ExtensionData
      { = value;

  class SampleService : ISampleService
  #region ISampleService Members
    public Person SampleMethod(Person msg)

      msg.lastName = "First Name";
      msg.firstName = "Last Name";
      msg.Message = "This is the Reply message.";
 	    return msg;

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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