Linq DataTable Group By 分组显示人员明细

Posted 2020-08-14 森林之子

实现功能：

     

多个字段分组源码样例：

原始数据：

 

分组后的输出结果：

源代码：

 1         public static void PrintPersons()
 2         {
 3             //准备数据
 4             DataTable dt = new DataTable();
 5             dt.Columns.Add(new DataColumn("ID", typeof(int)));
 6             dt.Columns.Add(new DataColumn("UserName", typeof(string)));
 7             dt.Columns.Add(new DataColumn("DeptNo", typeof(string)));
 8             dt.Columns.Add(new DataColumn("DeptName", typeof(string)));
 9             DataRow drTemp = null;
10             for (int i = 10; i <= 18; i++)
11             {
12                 drTemp = dt.NewRow();
13                 drTemp["ID"] = i;
14                 drTemp["UserName"] = "姓名" + i.ToString();
15 
16                 if (i < 15)
17                 {
18                     drTemp["DeptNo"] = "0001";
19                     drTemp["DeptName"] = "人事部";
20                 }
21                 else
22                 {
23                     drTemp["DeptNo"] = "0002";
24                     drTemp["DeptName"] = "生产部";
25                 }
26                 dt.Rows.Add(drTemp);
27             }
28 
29             Console.WriteLine("分组前：");
30             foreach (DataRow row in dt.Rows)
31             {
32                 Console.WriteLine(string.Format("{0} {1} {2} {3} ", row.ItemArray));
33             }
34             Console.WriteLine("");
35 
36             Console.WriteLine("分组后：");
37 
38             //Linq分组查询，并按分组显示人员明细
39             var query = from g in dt.AsEnumerable()
40                         group g by new { t1 = g.Field<string>("DeptNo"), t2 = g.Field<string>("DeptName") } into companys
41                         select new { DeptNo = companys.Key.t1, DeptName = companys.Key.t2, StallInfo = companys };
42 
43             foreach (var userInfo in query)
44             {
45                 System.Collections.Generic.List<DataRow> dataRows = userInfo.StallInfo.ToList();
46 
47                 Console.WriteLine(string.Format("{0}({1})人员名单: ", userInfo.DeptName, userInfo.DeptNo));
48                 foreach (System.Data.DataRow dr in dataRows)
49                 {
50                     Console.WriteLine(string.Format("{0} {1} ", dr.ItemArray));
51                 }
52             }
53             Console.ReadLine();
54         }