private Task <Result <TData> > With <TData>(IWith <TData> with)
{
var pipelineType = with.GetType();
var withMultipleType = typeof(WithMultiple <, ,>).MakeGenericType(pipelineType.GenericTypeArguments);
var withMultipleHandlerType =
typeof(WithMultipleHandler <, ,>).MakeGenericType(pipelineType.GenericTypeArguments);
var withMultipleHandler = _serviceProvider.GetService(withMultipleHandlerType);
var methodInfo = withMultipleHandlerType
.GetMethods(BindingFlags.Instance | BindingFlags.Public)
.Single(m => m.Name == nameof(IPipelineItemHandler <IPipeline> .ExecuteAsync));
var withMultipleObj = Convert.ChangeType(with, withMultipleType);
var invokeResult = methodInfo.Invoke(withMultipleHandler, new [] { withMultipleObj });
return((Task <Result <TData> >)invokeResult);
}