Guy kolbis

Here is an example of how to create a message inspector that will inspect every message that the client sends and modify the message body:

public class ClientOutputMessageInspector : IClientMessageInspector
{
    #region IClientMessageInspector Members

    public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
    {
        return;
    }

    public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel)
    {
        string action = request.Headers.GetHeader<string>("Action", request.Headers[0].Namespace);

        if (action.Contains("SendMessage"))
        {
            XmlDocument doc = new XmlDocument();
            MemoryStream ms = new MemoryStream();
            XmlWriter writer = XmlWriter.Create(ms);
            request.WriteMessage(writer);
            writer.Flush();
            ms.Position = 0;

            doc.Load(ms);
            ChangeMessage(doc);
            ms.SetLength(0);
            writer = XmlWriter.Create(ms);
            doc.WriteTo(writer);
            writer.Flush();
            ms.Position = 0;

            XmlReader reader = XmlReader.Create(ms);
            request = Message.CreateMessage(reader, int.MaxValue, request.Version);
        }
        return null;
    }

    void ChangeMessage(XmlDocument doc)
    {
        XmlNamespaceManager nsManager = new XmlNamespaceManager(doc.NameTable);
        nsManager.AddNamespace("s", "http://schemas.xmlsoap.org/soap/envelope/");
        nsManager.AddNamespace("tempuri", "http://tempuri.org/");
        XmlNode node = doc.SelectSingleNode("//s:Body/tempuriendMessage/tempuri:text", nsManager);

        if (node != null)
        {
            XmlText text = node.FirstChild as XmlText;

            if (text != null)
            {
                text.Value = "Modified: " + text.Value;
            }
        }
    }

    #endregion
}