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 > 0)
                {
                    //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 > 0)
                {
                    //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"] = 1;
            dr["ProgramTime_Name"] = "场次二";
            dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-12 12:20");
            dr["Saled"] = 21;
            dr["SaleNoStart"] = 14;
            dr["ComeIn"] = 11;
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["ProgramTime_ID"] = 2;
            dr["ProgramTime_Name"] = "场次三";
            dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-13 12:20");
            dr["Saled"] = 221;
            dr["SaleNoStart"] = 124;
            dr["ComeIn"] = 121;
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["ProgramTime_ID"] = 3;
            dr["ProgramTime_Name"] = "场次四";
            dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-14 12:20");
            dr["Saled"] = 231;
            dr["SaleNoStart"] = 134;
            dr["ComeIn"] = 131;
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["ProgramTime_ID"] = 3;
            dr["ProgramTime_Name"] = "场次四";
            dr["ProgramTime_Time"] = Convert.ToDateTime("2016-08-14 12:20");
            dr["Saled"] = 231;
            dr["SaleNoStart"] = 134;
            dr["ComeIn"] = 131;
            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 = 1, ProgramTime_Name = "场次一", ProgramTime_Time = Convert.ToDateTime("2016-08-09 12:20"), Saled = 1100, SaleNoStart = 1165, ComeIn = 61237 });
            list.Add(new ProgramTimeModel() { ProgramTime_ID = 2, ProgramTime_Name = "场次二", ProgramTime_Time = Convert.ToDateTime("2016-08-12 12:20"), Saled = 83, SaleNoStart = 62, ComeIn = 67 });
            list.Add(new ProgramTimeModel() { ProgramTime_ID = 3, ProgramTime_Name = "场次三", ProgramTime_Time = Convert.ToDateTime("2016-08-20 12:20"), Saled = 12, SaleNoStart = 456, ComeIn = 67 });
            list.Add(new ProgramTimeModel() { ProgramTime_ID = 3, ProgramTime_Name = "场次三", ProgramTime_Time = Convert.ToDateTime("2016-08-20 12:20"), Saled = 12, SaleNoStart = 456, ComeIn = 67 });
            return list;
        }

注：方式一或方式二只需要取一种