Group By - Where Linq Query

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Hello all,

I have a List<t> and I need to do some manipulation to this list. What I want is I want to group by this list elements by two columns and filter them with a certain value.

So I know how to group by by two colums such as:

C#

myList.GroupBy(g => new{ g.DB, g.Type }).Select(g => g.First())

But here while group by I want the Type equals to "C"
I dont know but my goal is to code something like:

C#

myList.GroupBy(g => new{ g.DB, g.Type.Equals("C") }).Select(g => g.First())

-OR-

C#

myList.GroupBy(g => new{ g.DB, g.Type }).Where(g => g.Type = "C").Select(g => g.First())

but I can not figure it out. Can someone help me complete this query. Thanks in advance.

Posted 4-Feb-13 20:34pm

wonder-FOOL

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Kiran Susarla · Accepted Answer · 2013-02-04T20:45:00

Solution 1

Try this:

C#

myList.GroupBy(g=> new {g.DB, g.Type}).Where(g=>g.Type=="C").FirstOrDefault();

Posted 4-Feb-13 20:45pm

Kiran Susarla

Santhosh Kumar Jayaraman · Accepted Answer · 2013-02-04T20:56:00

Solution 2

I believe First is one of the field inside your list.

C#

var newlist=myList.Where(g=>g.Type.Equals("C"))
.GroupBy(g => new{ g.DB, g.Type})
.Select(g => g.First());

Posted 4-Feb-13 20:56pm

Santhosh Kumar Jayaraman