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

 1                 //实体类版本
 2                 List<ProgramTimeModel> TotalAllList = GetData();
 3 
 4                 var a = from p in TotalAllList.AsEnumerable()
 5                         group p by p.ProgramTime_ID into g
 6                         select new ProgramTimeModel
 7                         {
 8                             ProgramTime_ID = g.Key,
 9                             Saled = g.Sum(p => p.Saled),
10                             ComeIn = g.Sum(p => p.ComeIn)
11                         };
12 
13                 //拿数据
14                 if (a != null && a.ToList().Count > 0)
15                 {
16                     //方式1
17                     List<ProgramTimeModel> TaList = new List<ProgramTimeModel>();
18                     foreach (ProgramTimeModel item in a)
19                     {
20                         TaList.Add(item);
21                     }
22 
23                     //方式2
24                     a.ToList().ForEach(p =>
25                         {
26                             TaList.Add(p);
27                         }
28                     );
29                 }
30 
31 
32                 //DataTable版本
33                 DataTable dtList = GetDataTable();
34                 var b = from r in dtList.AsEnumerable()
35                         group r by r.Field<long>("ProgramTime_ID") into g
36                         select new
37                         {
38                             ProgramTime_ID = g.Key,
39                             Saled = g.Sum(n => n.Field<int>("Saled")),
40                             ComeIn = g.Sum(n => n.Field<int>("ComeIn"))
41                         };
42 
43                 //拿数据1
44                 if (b != null && b.ToList().Count > 0)
45                 {
46                     //方式1
47                     DataTable dt = dtList.Clone();
48                     foreach (var item in b)
49                     {
50                         DataRow dr = dt.NewRow();
51                         dr["ProgramTime_ID"] = item.ProgramTime_ID;
52                         dr["Saled"] = item.Saled;
53                         dr["ComeIn"] = item.ComeIn;
54                         dt.Rows.Add(dr);
55                     }
56 
57                     //方式2
58                     b.ToList().ForEach(p =>
59                         {
60                             DataRow dr = dt.NewRow();
61                             dr["ProgramTime_ID"] = p.ProgramTime_ID;
62                             dr["Saled"] = p.Saled;
63                             dr["ComeIn"] = p.ComeIn;
64                             dt.Rows.Add(dr);
65                         }
66                     );
67                 }

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