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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. class LinqGroupDemo
  6. {
  7.     static public void Main(string[] args)
  8.     {
  9.         var query =
  10.             from column in GetSource()
  11.             group column by new {column.LocId, column.SecId} into g
  12.             orderby g.Key.LocId, g.Key.SecId
  13.             select new
  14.             {
  15.                 LocId = g.Key.LocId,
  16.                 SecId = g.Key.SecId,
  17.                 Columns = g
  18.             };
  19.  
  20.         foreach (var key in query)
  21.         {
  22.             Console.WriteLine("LocId:{0}, SecId:{1}",
  23.                               key.LocId,
  24.                               key.SecId);
  25.  
  26.             foreach (var column in key.Columns)
  27.             {
  28.                 Console.WriteLine("  StartElevation:{0}, EndElevation:{1}",
  29.                                   column.StartElevation,
  30.                                   column.EndElevation);
  31.             }
  32.         }
  33.     }
  34.  
  35.     static private List<Column> GetSource()
  36.     {
  37.         return new List<Column>
  38.         {
  39.             new Column { LocId = 1 , SecId = 1, StartElevation = 0, EndElevation = 160 },
  40.             new Column { LocId = 1 , SecId = 1, StartElevation = 160, EndElevation = 320 },
  41.             new Column { LocId = 1 , SecId = 2, StartElevation = 320, EndElevation = 640 },
  42.             new Column { LocId = 2 , SecId = 1, StartElevation = 0, EndElevation = 160 },
  43.             new Column { LocId = 2 , SecId = 2, StartElevation = 160, EndElevation = 320 }
  44.         };
  45.     }
  46. }
  47.  
  48. public class Column
  49. {
  50.     public int LocId { get; set; }
  51.     public int SecId { get; set; }
  52.     public double StartElevation { get; set; }
  53.     public double EndElevation { get; set; }
  54. }
  55.  
Success #stdin #stdout 0.07s 34288KB
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stdin
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Standard input is empty
stdout
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LocId:1, SecId:1
  StartElevation:0, EndElevation:160
  StartElevation:160, EndElevation:320
LocId:1, SecId:2
  StartElevation:320, EndElevation:640
LocId:2, SecId:1
  StartElevation:0, EndElevation:160
LocId:2, SecId:2
  StartElevation:160, EndElevation:320
https://ideone.com/qJT522
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
secret

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