linq group by

 

var customers = BuildCustomers();



var results = 

	from c in customers

	from o in c.Orders

	where c.FirstName.Length >=5 &&

		o.Product == "Milk"

	group by c into avg

	select new { 

				avg.Key.FirstName, avg.Key.LastName,

				avg =avg.Average( o => o.Quantity )

			};



ObjectDumper.Write(results, Writer );