Question

I have this piece of code

            var tblGrouped = dtCSV.AsEnumerable()
                .GroupBy(r => new
                {
                    product_id   = r.Field<String>("product_id"),
                    owner_org_id = r.Field<String>("owner_org_id"),
                });

But I want to add an additional column to filter by. Basically if course_type_id = 1 for example. dtCSV is the source where the course_type_id is populated. I tried the following but it didn’t work:

            var tblGrouped = dtCSV.AsEnumerable()
                .GroupBy(r => new
                {
                    product_id   = r.Field<String>("product_id"),
                    owner_org_id = r.Field<String>("owner_org_id"),
                    course_type_id = "1",
                });

Answer 1

If I understand your requirement correctly, you want to group rows which have a course_type_id of 1?

var tblGrouped = dtCSV.AsEnumerable()
    .Where(r => r.Field<String>("course_type_id") == "1")
    .GroupBy(r => new
        {
            product_id   = r.Field<String>("product_id"),
            owner_org_id = r.Field<String>("owner_org_id"),
        });