Linq DataTable Group By 分组显示人员明细

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：

         public static void PrintPersons()
         {
             //准备数据
             DataTable dt = new DataTable();
             dt.Columns.Add(new DataColumn("ID", typeof(int)));
             dt.Columns.Add(new DataColumn("UserName", typeof(string)));
             dt.Columns.Add(new DataColumn("DeptNo", typeof(string)));
             dt.Columns.Add(new DataColumn("DeptName", typeof(string)));
             DataRow drTemp = null;
             for (int i = ; i <= ; i++)
             {
                 drTemp = dt.NewRow();
                 drTemp["ID"] = i;
                 drTemp["UserName"] = "姓名" + i.ToString();

                 if (i < )
                 {
                     drTemp["DeptNo"] = "";
                     drTemp["DeptName"] = "人事部";
                 }
                 else
                 {
                     drTemp["DeptNo"] = "";
                     drTemp["DeptName"] = "生产部";
                 }
                 dt.Rows.Add(drTemp);
             }

             Console.WriteLine("分组前：");
             foreach (DataRow row in dt.Rows)
             {
                 Console.WriteLine(string.Format("{0} {1} {2} {3} ", row.ItemArray));
             }
             Console.WriteLine("");

             Console.WriteLine("分组后：");

             //Linq分组查询，并按分组显示人员明细
             var query = from g in dt.AsEnumerable()
                         group g by new { t1 = g.Field<string>("DeptNo"), t2 = g.Field<string>("DeptName") } into companys
                         select new { DeptNo = companys.Key.t1, DeptName = companys.Key.t2, StallInfo = companys };

             foreach (var userInfo in query)
             {
                 System.Collections.Generic.List<DataRow> dataRows = userInfo.StallInfo.ToList();

                 Console.WriteLine(string.Format("{0}({1})人员名单: ", userInfo.DeptName, userInfo.DeptNo));
                 foreach (System.Data.DataRow dr in dataRows)
                 {
                     Console.WriteLine(string.Format("{0} {1} ", dr.ItemArray));
                 }
             }
             Console.ReadLine();
         }