NScatterGather 0.4.0

// Use a RecipientsCollection to register the eligible recipients:
var collection = new RecipientsCollection();
collection.Add<Foo>(); // type
collection.Add(new Bar()); // instance
collection.Add((int n) => n.ToString()); // delegate

// Use an Aggregator for sending the requests to all the available
// recipients that can support the desired request/response types,
// and for aggregating the results:
var aggregator = new Aggregator(collection);

// Send a request to all the recipients
// capable of accepting and int.
// The results are then combined in the response:
AggregatedResponse<object> objects = await aggregator.Send(42);

// The following overload can be used when
// the return type is either known or binding.
// Only the recipients that accept an int and
// return a string will be invoked:
AggregatedResponse<string> strings = await aggregator.Send<string>(42);