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copied!<p>There are 2 additional ways to solve your problem:</p> <p>I. Use KnownTypeAttribute(string):</p> <pre><code>[DataContract] [KnownType("GetKnownTypes")] public abstract class MyParent { static IEnumerable<Type> GetKnownTypes() { return new Type[] { typeof(MyChild1), typeof(MyChild2), typeof(MyChild3) }; } } </code></pre> <p>II. Use constructor DataContractSerializer</p> <pre><code>[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Interface)] public class MyHierarchyKnownTypeAttribute : Attribute, IOperationBehavior, IServiceBehavior, IContractBehavior { private void IOperationBehavior.AddBindingParameters( OperationDescription description, BindingParameterCollection parameters) { } void IOperationBehavior.ApplyClientBehavior( OperationDescription description, ClientOperation proxy) { ReplaceDataContractSerializerOperationBehavior(description); } private void IOperationBehavior.ApplyDispatchBehavior( OperationDescription description, DispatchOperation dispatch) { ReplaceDataContractSerializerOperationBehavior(description); } private void IOperationBehavior.Validate(OperationDescription description) { } private void IServiceBehavior.AddBindingParameters( ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters) { ReplaceDataContractSerializerOperationBehavior(serviceDescription); } private void IServiceBehavior.ApplyDispatchBehavior( ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { ReplaceDataContractSerializerOperationBehavior(serviceDescription); } private void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { } private void IContractBehavior.AddBindingParameters( ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } private void IContractBehavior.ApplyClientBehavior( ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime) { ReplaceDataContractSerializerOperationBehavior(contractDescription); } private void IContractBehavior.ApplyDispatchBehavior( ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime) { ReplaceDataContractSerializerOperationBehavior(contractDescription); } private void IContractBehavior.Validate(ContractDescription contractDescription, ServiceEndpoint endpoint) { } private static void ReplaceDataContractSerializerOperationBehavior( ServiceDescription description) { foreach (var endpoint in description.Endpoints) { ReplaceDataContractSerializerOperationBehavior(endpoint); } } private static void ReplaceDataContractSerializerOperationBehavior( ContractDescription description) { foreach (var operation in description.Operations) { ReplaceDataContractSerializerOperationBehavior(operation); } } private static void ReplaceDataContractSerializerOperationBehavior( ServiceEndpoint endpoint) { // ignore mex if (endpoint.Contract.ContractType == typeof(IMetadataExchange)) { return; } ReplaceDataContractSerializerOperationBehavior(endpoint.Contract); } private static void ReplaceDataContractSerializerOperationBehavior( OperationDescription description) { var behavior = description.Behaviors.Find<DataContractSerializerOperationBehavior>(); if (behavior != null) { description.Behaviors.Remove(behavior); description.Behaviors.Add( new ShapeDataContractSerializerOperationBehavior(description)); } } public class ShapeDataContractSerializerOperationBehavior : DataContractSerializerOperationBehavior { public ShapeDataContractSerializerOperationBehavior( OperationDescription description) : base(description) { } public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList<Type> knownTypes) { var shapeKnownTypes = new List<Type> { typeof(Circle), typeof(Square) }; return new DataContractSerializer(type, name, ns, shapeKnownTypes); } public override XmlObjectSerializer CreateSerializer(Type type, XmlDictionaryString name, XmlDictionaryString ns, IList<Type> knownTypes) { //All magic here! var knownTypes = new List<Type> { typeof(MyChild1), typeof(MyChild2), typeof(MyChild3) }; return new DataContractSerializer(type, name, ns, knownTypes); } } } [ServiceContract()] [MyHierarchyKnownTypeAttribute] public interface IService {...} </code></pre> <p>NOTE: You must use this attribute on both sides: client side and service side!</p>

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