Question

I’ve got a DataTable where i want to perform a GroupBy query on.

year    url      type     id
=============================
        someurl  image    0
2003             date     0
        someurl  image    1
2009             date     1

I’ve managed to group on my id, but I am not able to select the columns “year” and “Url”.

This is my query:

var query = from row in table.AsEnumerable()
            let uri = row["uri"]
            group row by row.Field<int>("id") into grp
            orderby grp.Key
            select new
            {
                ID = grp.Key,
            };

How can i select the columns year and url?

Thanks in advance.

Answer 1

When you group by in LINQ your group (grp) in your case is an enumerable containing all the entries in a group (data rows in your case). You can then either foreach the entries or use aggregate functions like Max, First, etc. to extract a single value from the enumerable