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  1. using System;
  2. using System.Text;
  3. using System.Diagnostics;
  4.  
  5. public class Program
  6. {
  7.     static void Main(string[] args)
  8.     {
  9.         int max = 10000;
  10.         for (int times = 0; times < 5; times++)
  11.         {
  12.             {
  13.                 Console.WriteLine("\ntime: {0}", (times+1).ToString());
  14.                 Stopwatch sw = Stopwatch.StartNew();
  15.                 for (int i = 0; i < max; i++)
  16.                 {
  17.                     string msg = "Your total is ";
  18.                     msg += "$500 ";
  19.                     msg += DateTime.Now;
  20.                 }
  21.                 sw.Stop();
  22.                 Console.WriteLine("String +\t: {0}ms", ((int)sw.ElapsedMilliseconds).ToString().PadLeft(6));
  23.             }
  24.  
  25.             {
  26.                 Stopwatch sw = Stopwatch.StartNew();
  27.                 StringBuilder msg = new StringBuilder();
  28.                 for (int j = 0; j < max; j++)
  29.                 {
  30.                     // msg.Clear(); // .NET 4.0
  31.                     msg.Remove(0, msg.Length);
  32.                     msg.Append("Your total is ");
  33.                     msg.Append("$500 ");
  34.                     msg.Append(DateTime.Now);
  35.                 }
  36.                 sw.Stop();
  37.                 Console.WriteLine("StringBuilder\t: {0}ms", ((int)sw.ElapsedMilliseconds).ToString().PadLeft(6));
  38.             }
  39.         }
  40.         Console.Read();
  41.     }
  42. }
  43.  
Success #stdin #stdout 0.68s 38352KB
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stdin
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time: 1
String +	:     68ms
StringBuilder	:     62ms

time: 2
String +	:     66ms
StringBuilder	:     62ms

time: 3
String +	:     66ms
StringBuilder	:     63ms

time: 4
String +	:     67ms
StringBuilder	:     61ms

time: 5
String +	:     65ms
StringBuilder	:     61ms
https://ideone.com/YuaqY
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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