A LINQ lesson

Posted by Scott on 2. October 2008 14:18

I needed to get a query completed like this in LINQ.

Select max(uid) as uid, Serial_Number from Table Group BY Serial_Number

I thought about it for a while but didn't get anywhere.  I kept testing until I asked another person and they came up with:

        using (DataContext dc = new DataContext())
        {
            var q = from t in dc.TableTests
                    group t by t.SerialNumber
                        into g
                        select new
                        {
                            SerialNumber = g.Key,
                            uid = (from t2 in g select t2.uid).Max()
                        };
        }

This code is very nice and sweet.  It allows you to select the all MAX Rows of a table with a grouped table column. 

Hope you enjoyed this little lesson.  I decided to save this syntact because it is something I will most likely come accross again.

Scott