public ActionInvokable(DataServiceOperationContext operationContext, ServiceAction serviceAction, object site, object[] parameters, IParameterMarshaller marshaller)
{
_serviceAction = serviceAction;
ActionInfo info = serviceAction.CustomState as ActionInfo;
var marshalled = marshaller.Marshall(operationContext, serviceAction, parameters);
info.AssertAvailable(site, marshalled[0], true);
_action = () => CaptureResult(info.ActionMethod.Invoke(site, marshalled));
}