linq分组求和_实体类和datatable

1、数据分组求合，分别用的实体类以及datatable来分组求合，还有分组求和之后的如何取值

                 //实体类版本
                 List<ProgramTimeModel> TotalAllList = GetData();

                 var a = from p in TotalAllList.AsEnumerable()
                         group p by p.ProgramTime_ID into g
                         select new ProgramTimeModel
                         {
                             ProgramTime_ID = g.Key,
                             Saled = g.Sum(p => p.Saled),
                             ComeIn = g.Sum(p => p.ComeIn)
                         };

                 //拿数据
                 if (a != null && a.ToList().Count > )
                 {
                     //方式1
                     List<ProgramTimeModel> TaList = new List<ProgramTimeModel>();
                     foreach (ProgramTimeModel item in a)
                     {
                         TaList.Add(item);
                     }

                     //方式2
                     a.ToList().ForEach(p =>
                         {
                             TaList.Add(p);
                         }
                     );
                 }

                 //DataTable版本
                 DataTable dtList = GetDataTable();
                 var b = from r in dtList.AsEnumerable()
                         group r by r.Field<long>("ProgramTime_ID") into g
                         select new
                         {
                             ProgramTime_ID = g.Key,
                             Saled = g.Sum(n => n.Field<int>("Saled")),
                             ComeIn = g.Sum(n => n.Field<int>("ComeIn"))
                         };

                 //拿数据1
                 if (b != null && b.ToList().Count > )
                 {
                     //方式1
                     DataTable dt = dtList.Clone();
                     foreach (var item in b)
                     {
                         DataRow dr = dt.NewRow();
                         dr["ProgramTime_ID"] = item.ProgramTime_ID;
                         dr["Saled"] = item.Saled;
                         dr["ComeIn"] = item.ComeIn;
                         dt.Rows.Add(dr);
                     }

                     //方式2
                     b.ToList().ForEach(p =>
                         {
                             DataRow dr = dt.NewRow();
                             dr["ProgramTime_ID"] = p.ProgramTime_ID;
                             dr["Saled"] = p.Saled;
                             dr["ComeIn"] = p.ComeIn;
                             dt.Rows.Add(dr);
                         }
                     );
                 }

2、用到的datatable测试数据

 public DataTable GetDataTable()
         {
             DataTable dt = new DataTable();
             dt.Columns.Add("ProgramTime_ID", typeof(long));
             dt.Columns.Add("ProgramTime_Name", typeof(string));
             dt.Columns.Add("ProgramTime_Time", typeof(DateTime));
             dt.Columns.Add("Saled", typeof(int));
             dt.Columns.Add("SaleNoStart", typeof(int));
             dt.Columns.Add("ComeIn", typeof(int));

             DataRow dr = dt.NewRow();
             dr["ProgramTime_ID"] = ;
             dr["ProgramTime_Name"] = "场次二";
             dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-12 12:20");
             dr["Saled"] = ;
             dr["SaleNoStart"] = ;
             dr["ComeIn"] = ;
             dt.Rows.Add(dr);

             dr = dt.NewRow();
             dr["ProgramTime_ID"] = ;
             dr["ProgramTime_Name"] = "场次三";
             dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-13 12:20");
             dr["Saled"] = ;
             dr["SaleNoStart"] = ;
             dr["ComeIn"] = ;
             dt.Rows.Add(dr);

             dr = dt.NewRow();
             dr["ProgramTime_ID"] = ;
             dr["ProgramTime_Name"] = "场次四";
             dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-14 12:20");
             dr["Saled"] = ;
             dr["SaleNoStart"] = ;
             dr["ComeIn"] = ;
             dt.Rows.Add(dr);

             dr = dt.NewRow();
             dr["ProgramTime_ID"] = ;
             dr["ProgramTime_Name"] = "场次四";
             dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-14 12:20");
             dr["Saled"] = ;
             dr["SaleNoStart"] = ;
             dr["ComeIn"] = ;
             dt.Rows.Add(dr);

             return dt;
         }

3、实体类的测试数据

 public List<ProgramTimeModel> GetData()
         {
             List<ProgramTimeModel> list = new List<ProgramTimeModel>();
             list.Add(new ProgramTimeModel() { ProgramTime_ID = , ProgramTime_Name = "场次一", ProgramTime_Time = Convert.ToDateTime("2016-08-09 12:20"), Saled = , SaleNoStart = , ComeIn =  });
             list.Add(new ProgramTimeModel() { ProgramTime_ID = , ProgramTime_Name = "场次二", ProgramTime_Time = Convert.ToDateTime("2016-08-12 12:20"), Saled = , SaleNoStart = , ComeIn =  });
             list.Add(new ProgramTimeModel() { ProgramTime_ID = , ProgramTime_Name = "场次三", ProgramTime_Time = Convert.ToDateTime("2016-08-20 12:20"), Saled = , SaleNoStart = , ComeIn =  });
             list.Add(new ProgramTimeModel() { ProgramTime_ID = , ProgramTime_Name = "场次三", ProgramTime_Time = Convert.ToDateTime("2016-08-20 12:20"), Saled = , SaleNoStart = , ComeIn =  });
             return list;
         }

注：方式一或方式二只需要取一种