public void ApplyDispatchBehavior(OperationDescription operationDescription,

    System.ServiceModel.Dispatcher.DispatchOperation dispatchOperation)

{

    // Override default Behavior

    dispatchOperation.Invoker = new FacadeOperationInvoker(

                                        dispatchOperation.Invoker,

                                        operationDescription);   

}

public object Invoke(object instance, object[] inputs, out object[] outputs)

{

    // Action Scheme is the following :

    // Assembly/ClassName/MethodName/MethodNameOverloadedIfNecessaryElseSameName

    String[] scheme = operationDescription.Messages[0].Action.Split("/".ToCharArray());

    Object returnValue = null;

    if (scheme.Length != 4)

        throw new ApplicationException("Error in method execution according this action : "

            + operationDescription.Messages[0].Action);

    // First Step : the assembly

    Assembly assemb = Assembly.LoadFrom(

        String.Format("{0}\\{1}.dll",

        ConfigurationManager.AppSettings["DirectoryToMonitor"],

        scheme[0])

        );

    if (null != assemb)

    {

        // Second Step : the type

        Type t = assemb.GetType(scheme[1]);

        if (null != t)

        {

            // Third step : create the instance

            Object obj = Activator.CreateInstance(t);

            // Fourth step : execute the method

            returnValue = obj.GetType().InvokeMember(scheme[2], BindingFlags.InvokeMethod, null, obj, inputs);

            // Fifth step : Manage output values. In fact, output values are not managed in this sample!

            outputs = new Object[0];

        }

        else

        {

            throw new Exception(String.Format("Type {1} in Assembly {0} not found", scheme[0], scheme[1]));

        }

    }

    else

    {

        throw new Exception(String.Format("Assembly {0} not found", scheme[0]));

    }

    return returnValue;

}