Nóta
Aðgangur að þessari síðu krefst heimildar. Þú getur prófað aðskrá þig inn eða breyta skráasöfnum.
Aðgangur að þessari síðu krefst heimildar. Þú getur prófað að breyta skráasöfnum.
Use the First operator to return the first element in a sequence. Queries that use First are executed immediately.
Note
LINQ to SQL does not support the Last operator.
Example 1
The following code finds the first Shipper in a table:
If you run this query against the Northwind sample database, the results are
ID = 1, Company = Speedy Express.
Shipper shipper = db.Shippers.First();
Console.WriteLine("ID = {0}, Company = {1}", shipper.ShipperID,
shipper.CompanyName);
Dim shipper As Shipper = db.Shippers.First()
Console.WriteLine("ID = {0}, Company = {1}", shipper.ShipperID, _
shipper.CompanyName)
Example 2
The following code finds the single Customer that has the CustomerID BONAP.
If you run this query against the Northwind sample database, the results are ID = BONAP, Contact = Laurence Lebihan.
Customer custQuery =
(from custs in db.Customers
where custs.CustomerID == "BONAP"
select custs)
.First();
Console.WriteLine("ID = {0}, Contact = {1}", custQuery.CustomerID,
custQuery.ContactName);
Dim custquery As Customer = _
(From c In db.Customers _
Where c.CustomerID = "BONAP" _
Select c) _
.First()
Console.WriteLine("ID = {0}, Contact = {1}", custquery.CustomerID, _
custquery.ContactName)