Question

I have a simple select from a typed dataset:

var productlist = from prds in dsProducts.sk_products.AsEnumerable()
                          join prdcat in dsProducts.sk_productscategories.AsEnumerable() on prds.Field<int>("productid") equals prdcat.Field<int>("productid") where prdcat.Field<int>("categoryid") == categoryid
                          select prds;

Where productlist is set of records from the Dataset’s sk_products datatable.
I’d like to write a function to filter the records more, with a distinct on one of it’s columns:

 public List<string, string> GetDistinctManufacturerList(? productlist, int manufacturerid)
    {
       manufacturers = from prdz in productlist where prdz.Field<int>("manufacturerid") == manufacturerid select prdz; [...]
    }

With what type of object should I refer to the variable productlist?

Answer 1

Its an IEnumberable<selected data type> – the selected data type could be an anonymous type, or in this case, will be your dataset type class.