Return one column with a groupby query - List<int> anonymous type error

Hi, I want to store the values of one column (ColumnD) as a List<int> to use it as a look up later on.

           List<int> query = (from t in db.TABLE where t.RecordID == recordID 
                            group t by new { t.ColumnA, t.ColumnB,t.ColumnC }
                            into grp
                            select new { grp.ColumnD}).ToList();

            return query;

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The code above gives me the following error:
'cannot implicitly convert from anonymous Generic.List type <..> to Generic List<int>'

if i return the query as an object instead, it works. Then I can look for a value using this:
var x = data.Find(a => a.ColumnD == [a value]);

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But how can I store the values of one column in a list??

Thanks!
Adrian CrossAsked:
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YZlatCommented:
What if you try

List<int> query = (from t in db.TABLE where t.RecordID == recordID 
                            group t by new { t.ColumnA, t.ColumnB,t.ColumnC }
                            into grp
                            select new { grp.ColumnD}).ToList<int>();

            return query;

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0
louisfrCommented:
You can't get a List<int> because you are explicitly creating a list of anonymous objects with an int property called ColumnD.

Instead of
select new { grp.ColumnD}

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try not putting it in an object:
select grp.ColumnD

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0

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louisfrCommented:
No reply from the author but the proposed solution should work.
0
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