Question

I have got problem with this method:

    public List<int> menu_wid_w_kat()
    {
        DataSet1TableAdapters.menu_widac_wszystkoTableAdapter pk = new DataSet1TableAdapters.menu_widac_wszystkoTableAdapter();
        List<int> lista = new List<int>();
        lista = pk.?
        return lista;
    }

In dataset1 I have got Fill, GetData (@id) and this is connected with procedure (procedure working correct)

Problem is in this method because I don’t know how connect this method with dataset1 (but I don’t want to using linq: (lista = (from o in pk.GetData() select o.nazwa).ToList();))

my idea was but does not work but probably you will understand what I want to do it. Connection with method put (id number) and get data list:

lista = pk.GetData(id)

I just want to take data from this procedure which exist in dataset1.

correct but I can`t find method GetIdList()

baza nasza_baza = new baza();
var da = new DataSet1TableAdapters.menu_widac_wszystkoTableAdapter();
List productIDs = da. <- I cant`t find method

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace DataSet1TableAdapters 
{
    public partial class menu_widac_wszystkoTableAdapter
    {
        public List<int> GetIdList(int ids)
        {
            List<int> list = new List<int>();
            System.Data.SqlClient.SqlCommand command = this.CommandCollection(ids);
            command.CommandTimeout = command.Connection.ConnectionTimeout;

            System.Data.ConnectionState previousConnectionState = command.Connection.State;
            try
            {
                if (((command.Connection.State & System.Data.ConnectionState.Open) != System.Data.ConnectionState.Open))
                {
                    command.Connection.Open();
                }
                using (System.Data.SqlClient.SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        list.Add(reader.GetInt32(0));
                    }
                }
            }
            finally
            {
                if ((previousConnectionState == System.Data.ConnectionState.Closed))
                {
                    command.Connection.Close();
                }
            }

            return list;
        }

        private System.Data.SqlClient.SqlCommand CommandCollection(int p)
        {
            throw new NotImplementedException();
        } 

    }
}

Answer 1

The fastest approach is to extend the autogenerated TableAdapter in your DataSet with a method that returns your ID’s as List<int>.

If you want to extend the functionality you can’t change the generated classes in the DatesetName.designer.cs/vb (it will be recreated on any change) but the file without designer in its name(create it if it not exists). Then you have to extend the partial TableAdapter-class(in your case menu_widac_wszystkoTableAdapter).

Have a look at following code to see what i mean, i haven’t tested it but i hope you take my point:

namespace YourRootNameSpace.DataSet1TableAdapters {
{
    public partial class menu_widac_wszystkoTableAdapter
    {
        public List<int> GetIdList(int categoryID)
        {
            List<int> list = new List<int>();
            System.Data.SqlClient.SqlCommand command = this.CommandCollection[0];
            command.CommandTimeout = command.Connection.ConnectionTimeout;

            System.Data.ConnectionState previousConnectionState = command.Connection.State;
            try {
                if (((command.Connection.State & System.Data.ConnectionState.Open) != System.Data.ConnectionState.Open)) {
                    command.Connection.Open();
                }
                command.Parameters[ "@id" ].Value = categoryID;
                using (System.Data.SqlClient.SqlDataReader reader = command.ExecuteReader()) {
                    while (reader.Read()) {
                        list.Add(reader.GetInt32(0));
                    }
                }
            } finally {
                if ((previousConnectionState == System.Data.ConnectionState.Closed)) {
                    command.Connection.Close();
                }
            }

            return list;
        }
    }
}

Edit: After i’ve read your edited question i saw that i’ve misunderstood your requirement a little bit, but my approach should be perfect anyway. Basically you don’t want to get a DataTable but a List<int> with your product_ids.

After you’ve extended the TableAdapter in the abovementioned way:

var da = new DataSet1TableAdapters.menu_widac_wszystkoTableAdapter();
List<int> productIDs = da.GetIdList();