Linq To DataSet

        private static void LinqToDataSet()

        {

            string sql = "select * from Advertising";

            using (DataSet ds = GetDataSet(sql))

            {

                if (ds != null)

                {

                    if (ds.Tables[0].Rows.Count > 0)

                    {

                        //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[0].AsEnumerable()

                                      where adv.Field<int>("AdvertisingType").ToString() != "0" && 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);

                    }

                }

            }

        }