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  1. using System.Diagnostics;
  2. using System;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5.  
  6. public class Test
  7. {
  8.     static string[][] GetRandomJaggedArray(int numberOfArrays, int numberOfElements)
  9.     {
  10.         string[][] temp = new string[numberOfArrays][];
  11.         for (int i = 0; i < numberOfArrays; i++)
  12.         {
  13.            temp[i] = new string[numberOfElements];
  14.            for (int i2 = 0; i2 < temp.Length; i2++)
  15.                temp[i][i2] = Guid.NewGuid().ToString();                                                                                              
  16.         }
  17.  
  18.         return temp;
  19.     }
  20.  
  21.     static TimeSpan getElementsAtIndexLINQ(string[][] listOfArrays, int index, int count)
  22.     {
  23.         Stopwatch s  = new Stopwatch(); 
  24.         List<string> myListOfStrings;
  25.  
  26.         s.Start();
  27.         for (int i = 0; i < count; i++)            
  28.             myListOfStrings = listOfArrays.Select(a => a[index]).ToList();            
  29.         s.Stop();
  30.         return s.Elapsed;
  31.     }
  32.  
  33.     static TimeSpan getElementsAtIndexFOR(string[][] listOfArrays, int index, int count)
  34.     {
  35.         Stopwatch s = new Stopwatch();
  36.         s.Start();
  37.         for (int i2 = 0; i2 < count; i2++ ) {
  38.         	List<string> myListOfStrings = new List<string>();
  39.             for (int i = 0; i < listOfArrays.Length; i++)
  40.                 myListOfStrings.Add(listOfArrays[i][index]);
  41.         }
  42.         s.Stop();
  43.         return s.Elapsed;
  44.     }
  45.  
  46.     static void Main(string[] args)
  47.     {
  48.         string[][] test1 = GetRandomJaggedArray(100, 1000);
  49.  
  50.         string[][] test2 = GetRandomJaggedArray(100, 1000);
  51.  
  52. getElementsAtIndexFOR(test2, 1, 1);
  53.  
  54.         TimeSpan t2 = getElementsAtIndexFOR(test2, 1, 10);
  55.  
  56. getElementsAtIndexLINQ(test1, 1, 1);
  57.         TimeSpan t1 = getElementsAtIndexLINQ(test1, 1, 10);
  58.  
  59.         Console.WriteLine("Linq method took {0} ticks to execute", t1.Ticks);
  60.  
  61.         Console.WriteLine("For method took {0} ticks to execute", t2.Ticks);
  62.  
  63.     }
  64. }
Success #stdin #stdout 0.26s 25512KB
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stdin
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Standard input is empty
stdout
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Linq method took 1689 ticks to execute
For method took 535 ticks to execute
https://ideone.com/RVRbPl
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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