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  1. using System;
  2. using System.Diagnostics;
  3. using System.Linq;
  4. using System.Runtime.CompilerServices;
  5.  
  6. namespace ConsoleApplication85
  7. {
  8.     class Program
  9.     {
  10.         static void Main()
  11.         {
  12.             int n = 100000;
  13.             var results1 = new long[10];
  14.             var results2 = new long[10];
  15.             for (int i = 0; i < results1.Length; i++)
  16.             {
  17.                 results1[i] = Test(0, n, Concat);
  18.                 results2[i] = Test(n, n, Insert);
  19.             }
  20.             Console.WriteLine("Concat = {0}{2}Insert = {1}", results1.Average(), results2.Average(), Environment.NewLine);
  21.             Console.ReadKey();
  22.         }
  23.  
  24.         private static long Test(int start, int n, Func<string,string,string> func)
  25.         {
  26.             var sw = Stopwatch.StartNew();
  27.             var strings = new string[n];
  28.             for (int i = 0, j = start; i < strings.Length; i++, j++)
  29.             {
  30.                 strings[i] = func(j.ToString(), j.ToString());
  31.             }
  32.             sw.Stop();
  33.             GC.Collect();
  34.             GC.WaitForPendingFinalizers();
  35.             GC.Collect();
  36.             return sw.ElapsedMilliseconds;
  37.         }
  38.  
  39.         [MethodImpl(MethodImplOptions.NoInlining)]
  40.         private static string Concat(string a, string b)
  41.         {
  42.             return a + b;
  43.         }
  44.  
  45.         [MethodImpl(MethodImplOptions.NoInlining)]
  46.         private static string Insert(string a, string b)
  47.         {
  48.             return b.Insert(0, a);
  49.         }
  50.     }
  51. }
  52.  
Success #stdin #stdout 1.18s 42664KB
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Standard input is empty
stdout
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Concat = 50.3
Insert = 54
https://ideone.com/Bqm7tk
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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