Question

I have SqlDataReader that was sitting in a page’s code behind (well actually a web user control). I’d like to move this code to a separate class which the user control calls. But how do I bind the data from the class to the on page repeater?

Is this an acceptable concept?

Here’s my code moved to a class:

public class ShoppingCart
{
    public ShoppingCart(int ShoppingCartHeadID)
    {
        SqlConnection conn;
        SqlCommand comm;
        SqlDataReader reader;

        conn = new SqlConnection(iceConns.iconn);

        comm = new SqlCommand("Ordering.sl_ShoppingCartContents", conn);
        comm.CommandType = CommandType.StoredProcedure;
        comm.Parameters.Add(new SqlParameter("@shoppingCartHeadID", SqlDbType.Int));
        comm.Parameters["@shoppingCartHeadID"].Value = ShoppingCartHeadID;

        try
        {
            conn.Open();
            reader = comm.ExecuteReader();
            Cart.DataSource = reader; //This ain't gonna work!
            if (reader.HasRows)
            {
                Cart.DataBind(); //This ain't gonna work!
                varCartStatus = true;
            }
            reader.Close();
        }
        catch
        {
            //Error trapping
        }
        finally
        {
            conn.Close();
        }
    }
}

Any help would be greatly appreciated.

Answer 1

You should create an entity object for the returned data. Then you can bind any control to a List of the object you created.

Create a Cart object with the properties that map to your database table.
Then create a class like CartRepository that will have a method called GetCartById(CartId). This method will do the work above, but instead of trying to bind anything here you are simply going to fill your Cart objects. The return a list of those objects and you can bind that list to any control.

public class Cart
{
    //Properties from cart - Just using name as an example.
    public string name { get; set; }
}

public class CartRepository
{
    public List<Cart> GetById(int cartId)
    {
        List<Cart> carts = new List<Cart>();

        // Do all sql work including setting up connection, command, ect.

        while(reader.read())
        {
            // Map your reader to your cart object.
            Cart c = new Cart();
            c.name = reader["name"].ToString();
            carts.add(c);
        }

        return carts;
    }
}

Now from your code just bind your control to the List returned from the repository object.

 myControl1.DataSource = CartRepository.GetById(cartId);