IN queries with LINQ to SQL

Ola — Tue, 01 Jun 2010 13:33:12 +0000

This is another awesome feature in LINQ to SQL that i always forget about. Sometimes you have an array of strings or any other type and want to query the database for all values that have one of the values in the array.

string platform = "windows|linux";
string[] platformList = platform.Split('|');
itemQuery = from m in itemQuery
from p in m.PlattformItemRelations
where platformList.Contains(p.Plattform.Text.ToLower())
select m;

Ain’t that a beauty? I got this tip from Ron Connery so all the kudos to him.

Group By with LINQ

Ola — Mon, 24 Nov 2008 12:16:58 +0000

Today i wanted to do a group by query with LINQ wich is something i never done before. I turned out to be kind of easy.

If you just want to group by a single field.

(from s in db.CrewStatsSet
where s.LogDate >= date1 && s.LogDate <= date2 && s.Action == action
group s by s.User.nick into g
orderby g.Count() descending
select new CrewStatsData
{
Nick = g.Key,
Count = g.Count(),
}).ToList();

And if you need to group by multiple fields.

(from s in db.CrewStatsSet
where s.LogDate >= date1 && s.LogDate <= date2 && s.Action == action
group s by new { s.User.nick, s.Action, s.User.userID } into g
orderby g.Count() descending
select new CrewStatsData
{
Nick = g.Key.nick,
Count = g.Count(),
ActionId = g.Key.Action,
UserId = g.Key.userID
}).ToList();

Codepolice.net » Linq to sql

IN queries with LINQ to SQL

Group By with LINQ