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  1. using System;
  2. using System.Text;
  3. using System.Diagnostics;
  4. using System.Collections.Generic;
  5.  
  6. class TestClass
  7.     {
  8.         public List<string> Base { get; set; }
  9.         public TestClass()
  10.         {
  11.             this.Base = new List<string>();
  12.             GenFakeBase();            
  13.         }
  14.  
  15.         public TimeSpan FormatStringTest()
  16.         {
  17.             Stopwatch sw = new Stopwatch();
  18.             sw.Start();
  19.             foreach (var z in this.Base) {
  20.                 var dt = String.Format("20{0}.{1}.{2}",
  21.                                        z.Substring(0, 2),
  22.                                        z.Substring(2, 2),
  23.                                        z.Substring(4, 2));
  24.             }
  25.             sw.Stop();
  26.             return sw.Elapsed;
  27.         }
  28.  
  29.  
  30.         public TimeSpan StringBuilderFormatTest()
  31.         {
  32.             Stopwatch sw = new Stopwatch();
  33.             sw.Start();
  34.             foreach (var z in this.Base)
  35.             {
  36.                 StringBuilder sb = new StringBuilder();
  37.                 var dt = sb.AppendFormat("20{0}.{1}.{2}",
  38.                                         z.Substring(0, 2), 
  39.                                         z.Substring(2, 2),
  40.                                         z.Substring(4, 2)).ToString();
  41.  
  42.             }
  43.             sw.Stop();
  44.             return sw.Elapsed;
  45.        }
  46.  
  47.         private void GenFakeBase()
  48.         {
  49.             Random r = new Random();
  50.  
  51.             for (int i = 0; i < 40000; i++)
  52.             {
  53.                 this.Base.Add(String.Format("{0:yyMMdd}",
  54.                               new DateTime(r.Next(2000, 2099), r.Next(1, 12), r.Next(1, 25))));
  55.             }                         
  56.  
  57.         }
  58.  
  59. 		public static void Main()
  60. 		{
  61. 			for(int i=0;i<20;++i)
  62. 			{
  63. 				TestClass t=new TestClass();
  64. 				if((i&1)!=0) Console.WriteLine(String.Format("FormatStringTest: {0}",t.FormatStringTest()));
  65. 				else Console.WriteLine(String.Format("StringBuilderFormatTest: {0}",t.StringBuilderFormatTest()));
  66. 			}
  67. 		}
  68.     }
  69.  
Success #stdin #stdout 4.82s 43640KB
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stdin
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Standard input is empty
stdout
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StringBuilderFormatTest: 00:00:00.0513856
FormatStringTest: 00:00:00.0442365
StringBuilderFormatTest: 00:00:00.0522395
FormatStringTest: 00:00:00.0472296
StringBuilderFormatTest: 00:00:00.0520350
FormatStringTest: 00:00:00.0475801
StringBuilderFormatTest: 00:00:00.0503980
FormatStringTest: 00:00:00.0487558
StringBuilderFormatTest: 00:00:00.0497289
FormatStringTest: 00:00:00.0458031
StringBuilderFormatTest: 00:00:00.0504880
FormatStringTest: 00:00:00.0459127
StringBuilderFormatTest: 00:00:00.0485575
FormatStringTest: 00:00:00.0461852
StringBuilderFormatTest: 00:00:00.0482333
FormatStringTest: 00:00:00.0460719
StringBuilderFormatTest: 00:00:00.0477882
FormatStringTest: 00:00:00.0455385
StringBuilderFormatTest: 00:00:00.0507450
FormatStringTest: 00:00:00.0457698
https://ideone.com/O365uh
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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