Question

I’m trying to return a set of distinct values from a DataTable using LINQ.

This is my code without the ‘Distinct’ part as I’m struggling to formulate the proper linq statement:

 DataTable gridData = RgClientData.DataSource as DataTable;
   var results = from myRow in gridData .AsEnumerable()
             select (myRow.Field<string>("AssignedUser"));

Just adding “Distinct()” to the end of the select does not work. I’m wrestling with the syntax because I don’t fully understand how the ‘Distinct’ part relates to the Linq query.

Could someone point me in the right direction…thanks

Answer 1

Your query needs to be enclosed within parentheses in order to add Distinct to the end of it:

var results = (from myRow in gridData .AsEnumerable()
              select myRow.Field<string>("AssignedUser")).Distinct();

Or you could switch to the fluent syntax:

var results = gridData.AsEnumerable()
                      .Select(myRow => myRow.Field<string>("AssignedUser"))
                      .Distinct();