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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4. using System.Diagnostics;
  5.  
  6. public class MyObject {
  7.     public MyObject()
  8.     {
  9.     }
  10.  
  11.     public MyObject(int myProperty1, int myProperty2, int myProperty3)
  12.     {
  13.       MyProperty1 = myProperty1;
  14.       MyProperty2 = myProperty2;
  15.       MyProperty3 = myProperty3;
  16.     }
  17.  
  18.     public int MyProperty1 { get; set; }
  19.     public int MyProperty2 { get; set; }
  20.     public int MyProperty3 { get; set; }
  21. }
  22.  
  23. public class Test
  24. {
  25. 	public static void Main()
  26. 	{
  27. 	  var myObjects = new List<MyObject>();
  28.       var random = new Random();
  29.       for (var i = 0; i < 1000000; i++)
  30.       {
  31.         myObjects.Add(new MyObject(random.Next(), random.Next(), random.Next()));
  32.       }
  33.  
  34.       var sw = new Stopwatch();
  35.       sw.Start();
  36.       var summed = myObjects.Aggregate(new MyObject(), (acc, x) =>
  37.       {
  38.         acc.MyProperty1 += x.MyProperty1;
  39.         acc.MyProperty2 += x.MyProperty2;
  40.         acc.MyProperty3 += x.MyProperty3;
  41.         return acc;
  42.       });
  43.       sw.Stop();
  44.       var t1 = sw.ElapsedMilliseconds;
  45.       sw.Reset();
  46.  
  47.       sw.Start();
  48.       var summed2 = new MyObject();
  49.       foreach (var obj in myObjects)
  50.       {
  51.         summed2.MyProperty1 += obj.MyProperty1;
  52.         summed2.MyProperty2 += obj.MyProperty2;
  53.         summed2.MyProperty3 += obj.MyProperty3;
  54.       }
  55.       sw.Stop();
  56.       var t2 = sw.ElapsedMilliseconds;
  57.       sw.Reset();
  58.  
  59.       Console.WriteLine("Aggregate: " + t1 + "ms");
  60.       Console.WriteLine("foreach:   " + t2 + "ms");
  61.  
  62. 	}
  63. }
Success #stdin #stdout 0.16s 58740KB
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stdin
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Standard input is empty
stdout
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Aggregate: 15ms
foreach:   7ms
https://ideone.com/RliVVp
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
public

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