Linq To DataSet

        private static void LinqToDataSet()
        {
            string sql = "select * from Advertising";
            using (DataSet ds = GetDataSet(sql))
            {
                if (ds != null)
                {
                    if (ds.Tables[].Rows.Count > )
                    {
                        //查询全局广告
                        List<Advertising> listCompany = new List<Advertising>();
                        Guid guid = new Guid("B362A0D1-99D2-432F-8345-28D0E0B94B88");
                        //查询总部和广告
                        var Company = from adv in ds.Tables[].AsEnumerable()
                                      where adv.Field<int>("AdvertisingType").ToString() != "" && adv.Field<Guid>("CompanyId") == guid
                                      orderby adv.Field<int>("AdvertisingType") ascending, adv.Field<int>("Orders") ascending
                                      select new
                                      {
                                          AdvertisingId = adv.Field<Guid>("AdvertisingId"),
                                          AdvertisingName = adv.Field<string>("AdvertisingName"),
                                          SupplierId = adv.Field<Guid>("SupplierId"),
                                          CompanyId = adv.Field<Guid>("CompanyId"),
                                          AdvertisingType = adv.Field<int>("AdvertisingType"),
                                          StartTime = adv.Field<DateTime>("StartTime"),
                                          EndTime = adv.Field<DateTime>("EndTime"),
                                          Orders = adv.Field<int>("Orders"),
                                          Content = adv.Field<string>("Content"),
                                          AdvertisingArea = adv.Field<int>("AdvertisingArea"),
                                          FilePath = adv.Field<string>("FilePath")
                                      };

                        foreach (var company in Company)
                        {

                            Advertising advertising = new Advertising();
                            advertising.AdvertisingId = company.AdvertisingId.ToString();
                            advertising.AdvertisingName = company.AdvertisingName;
                            advertising.SupplierIdId = company.SupplierId.ToString();
                            advertising.CompanyId = company.CompanyId.ToString();
                            advertising.AdvertisingType = company.AdvertisingType;
                            advertising.StartTime = company.StartTime;
                            advertising.EndTime = company.EndTime;
                            advertising.Orders = company.Orders;
                            advertising.Content = company.Content;
                            advertising.AdvertisingArea = company.AdvertisingArea;
                            advertising.FilePath = company.FilePath;

                            listCompany.Add(advertising);
                        }
                        File.WriteAllText("c:/System.txt", ToJson(listSystem));

                        Console.WriteLine("生成完成");
                        // DataRow[] drCountry = ds.Tables[0].Select(where);
                    }
                }
            }
        }