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    <p>I had to do something like this recently and what I ended up doing was creating a behaviour that implemented <code>IClientMessageInspector</code> and used the <code>BeforeSendRequest</code> method to create data for my header and then populate it into the SOAP request.</p> <pre><code>public class SoapHeaderBehaviour : BehaviorExtensionElement, IClientMessageInspector { public void AfterReceiveReply(ref Message reply, object correlationState) { } public object BeforeSendRequest(ref Message request, IClientChannel channel) { var security = new Security(); // details irrelevant var messageHeader = MessageHeader.CreateHeader("Security", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd", security, new ConcreteXmlObjectSerializer(typeof(Security)), true); request.Headers.Add(messageHeader); return null; } protected override object CreateBehavior() { return new SoapHeaderBehaviour(); } public override Type BehaviorType { get { return GetType(); } } } </code></pre> <p>ConcreteXmlObjectSerializer is a class I found on the internet somewhere (unfortunately can't seem to find it right now) that just worked. Here is the code for that:</p> <pre><code>public class ConcreteXmlObjectSerializer : XmlObjectSerializer { readonly Type objectType; XmlSerializer serializer; public ConcreteXmlObjectSerializer(Type objectType) : this(objectType, null, null) { } public ConcreteXmlObjectSerializer(Type objectType, string wrapperName, string wrapperNamespace) { if (objectType == null) throw new ArgumentNullException("objectType"); if ((wrapperName == null) != (wrapperNamespace == null)) throw new ArgumentException("wrapperName and wrapperNamespace must be either both null or both non-null."); if (wrapperName == string.Empty) throw new ArgumentException("Cannot be the empty string.", "wrapperName"); this.objectType = objectType; if (wrapperName != null) { XmlRootAttribute root = new XmlRootAttribute(wrapperName); root.Namespace = wrapperNamespace; this.serializer = new XmlSerializer(objectType, root); } else this.serializer = new XmlSerializer(objectType); } public override bool IsStartObject(XmlDictionaryReader reader) { throw new NotImplementedException(); } public override object ReadObject(XmlDictionaryReader reader, bool verifyObjectName) { Debug.Assert(serializer != null); if (reader == null) throw new ArgumentNullException("reader"); if (!verifyObjectName) throw new NotSupportedException(); return serializer.Deserialize(reader); } public override void WriteStartObject(XmlDictionaryWriter writer, object graph) { throw new NotImplementedException(); } public override void WriteObjectContent(XmlDictionaryWriter writer, object graph) { if (writer == null) throw new ArgumentNullException("writer"); if (writer.WriteState != WriteState.Element) throw new SerializationException(string.Format("WriteState '{0}' not valid. Caller must write start element before serializing in contentOnly mode.", writer.WriteState)); using (MemoryStream memoryStream = new MemoryStream()) { using (XmlDictionaryWriter bufferWriter = XmlDictionaryWriter.CreateTextWriter(memoryStream, Encoding.UTF8)) { serializer.Serialize(bufferWriter, graph); bufferWriter.Flush(); memoryStream.Position = 0; using (XmlReader reader = new XmlTextReader(memoryStream)) { reader.MoveToContent(); writer.WriteAttributes(reader, false); if (reader.Read()) // move off start node (we want to skip it) { while (reader.NodeType != XmlNodeType.EndElement) // also skip end node. writer.WriteNode(reader, false); // this will take us to the start of the next child node, or the end node. reader.ReadEndElement(); // not necessary, but clean } } } } } public override void WriteEndObject(XmlDictionaryWriter writer) { throw new NotImplementedException(); } public override void WriteObject(XmlDictionaryWriter writer, object graph) { Debug.Assert(serializer != null); if (writer == null) throw new ArgumentNullException("writer"); serializer.Serialize(writer, graph); } } </code></pre> <p>This is then hooked into the WCF client endpoint via the config file in 3 steps (all under the <code>system.serviceModel</code> node:</p> <p>Register the extension</p> <pre><code>&lt;extensions&gt; &lt;behaviorExtensions&gt; &lt;add name="ClientSoapHeaderAdderBehaviour" type="MyNamespace.SoapHeaderBehaviour, MyAssembly, Version=My.Version, Culture=neutral, PublicKeyToken=null" /&gt; &lt;/behaviorExtensions&gt; &lt;/extensions&gt; </code></pre> <p>Create an endpoint behaviour using it</p> <pre><code>&lt;behaviors&gt; &lt;endpointBehaviors&gt; &lt;behavior name="MyEndpointBehaviours"&gt; &lt;ClientSoapHeaderAdderBehaviour /&gt; &lt;/behavior&gt; &lt;/endpointBehaviors&gt; &lt;/behaviors&gt; </code></pre> <p>Attach your endpoint behaviour to your client endpoint</p> <pre><code>&lt;client&gt; &lt;endpoint address="blah" binding="basicHttpBinding" bindingConfiguration="blah" contract="blah" name="blah" behaviorConfiguration="MyEndpointBehaviours"/&gt; &lt;/client&gt; </code></pre> <p>Hope this helps you.</p>
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    1. POHow to implement a Security token in a WCF soap response?
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    1. USDavidJones
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    1. COThank you! With some tweaks it worked perfectly!
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