Professional LINQ

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Scott Klein

"Professional LINQ"

List quantity = new List {99, 48, 120, 73, 101, 81, 56};
int cnt = quantity.Count;
listbox1.items.add(cnt);
When run, this query returns 7. In the following example, the Count operator is used to count the number
of items for the specified sales order.
var query =
from od in orderdetail
where od.SalesOrderID == 43662
select od.UnitPrice;
listbox1.Items.Add(query.Count());
When this query is executed, the list box contains the value of 22, meaning that there are 22 items for the
specified order.
You can also specify a criterion for the Count operator. Here??™s an example in which the Count operator is
applied but given a condition, where the unit price is less than 200.
var query =
from od in orderdetail
where od.SalesOrderID == 43662
select od;
listbox1.Items.Add(query.Count(orderDetail => orderDetail.UnitPrice < 200));
65
Part I: Introduction to Project LINQ
LongCount
The LongCount operator, which returns an Int64 (a 64-bit integer), is used to count the number of elements
in a large collection??”one with more than Int32.

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An Account of the Customs and Manners of the Micmakis and Maricheets Savage Nations, Now Dependent on the Government of Cape-Breton (page 26) Danny's Own Story (page 47) Mrs. Falchion, Volume 2. (page 189)

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Scott Klein

"Professional LINQ"