Group by in a list of objects

Question

I have a list of objects like this:

BonusesToApprove = new List<Bonus>();

I need to group it by id. I've tried several approaches like the suggestion here but the compiler returns message:

System.Collections.Generic.List<AdHoc.Objects.Bonus> does not contain a definition for 'GroupBy' ...

A sample of the code I've tried is:

var grouped = BonusesToApprove
    .GroupBy ...

Can anyone tell me what I'm doing wrong?

`but the compiler does not like it`. That is very explanatory :) — I4V, Aug 06 '13 at 01:18
Group by id : `.GroupBy(t=>t.id)` - but do you really need to group by ID? Usually ID is unique, so you will have a lot of groups with a single member.. — Blorgbeard, Aug 06 '13 at 01:19
when I do this: var grouped = BonusesToApprove.GroupBy(t => t.id); I get System.Collections.Generic.List does not contain a definition for 'GroupBy' ... — CodeGurl, Aug 06 '13 at 01:23

score 2 · Accepted Answer · answered Aug 06 '13 at 01:25

2

You may have forgotten to reference the LINQ namespace in your class.

Put this at the top with any other using statements you have:

using System.Linq;

answered Aug 06 '13 at 01:25

Grant Winney

1 Answers1