winform获取checkedListBox控件的值

string ShopTypeIds = "";
            for (int i = 0; i < clb_ShopType.CheckedItems.Count; i++)
            {
                DataRowView dv = ((DataRowView)clb_ShopType.CheckedItems[i]);
                if (ShopTypeIds == "")
                {
                    ShopTypeIds = dv["id"].ToString();
                }
                else
                {
                    ShopTypeIds += "," + dv["id"].ToString();
                }
            }