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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4.  
  5. namespace ConsoleApplication18
  6. {
  7.     class Program
  8.     {
  9.         static void Main(string[] args)
  10.         {
  11.             var arr = new byte[100000000];
  12.  
  13.             var sw = Stopwatch.StartNew();
  14.             try
  15.             {
  16.                 Console.WriteLine(arr.Single(i => i == 0));
  17.             }
  18.             catch (Exception)
  19.             {
  20.                 sw.Stop();
  21.             }
  22.             finally
  23.             {
  24.                 Console.WriteLine(sw.Elapsed);
  25.             }
  26.  
  27.  
  28.             var sw2 = Stopwatch.StartNew();
  29.             try
  30.             {
  31.                 Console.WriteLine(arr.MySingle(i => i == 0));
  32.             }
  33.             catch (Exception)
  34.             {
  35.                 sw2.Stop();
  36.             }
  37.             finally
  38.             {
  39.                 Console.WriteLine(sw2.Elapsed);
  40.             }
  41.  
  42.             Console.WriteLine("Difference = {0}", (double) sw.ElapsedTicks/sw2.ElapsedTicks);
  43.  
  44.         }
  45.     }
  46.  
  47.     public static class LinqTester
  48.     {
  49.         public static TSource MySingle<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
  50.         {
  51.             if (source == null)
  52.                 throw new ArgumentNullException("source");
  53.             if (predicate == null)
  54.                 throw new ArgumentNullException("predicate");
  55.             TSource result = default(TSource);
  56.             int count = 0;
  57.             foreach (TSource value in source)
  58.             {
  59.                 if (predicate(value))
  60.                 {
  61.                     checked { ++count; }
  62.                     if (count > 1)
  63.                         throw new Exception("MoreThanOneMatch");
  64.                     result = value;
  65.                 }
  66.             }
  67.             if (count == 0)
  68.                 throw new Exception("NoMatch");
  69.             return result;
  70.         }
  71.  
  72.         public static TSource Single<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate)
  73.         {
  74.             if (source == null)
  75.                 throw new ArgumentNullException("source");
  76.             if (predicate == null)
  77.                 throw new ArgumentNullException("predicate");
  78.             TSource source1 = default(TSource);
  79.             long num = 0L;
  80.             foreach (TSource source2 in source)
  81.             {
  82.                 if (predicate(source2))
  83.                 {
  84.                     source1 = source2;
  85.                     checked { ++num; }
  86.                 }
  87.             }
  88.             switch (num)
  89.             {
  90.                 case 0L:
  91.                     throw new Exception("NoMatch");
  92.                 case 1L:
  93.                     return source1;
  94.                 default:
  95.                     throw new Exception("MoreThanOneMatch");
  96.             }
  97.         }
  98.     }
  99. }
  100.  
Success #stdin #stdout 3.85s 131776KB
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Standard input is empty
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00:00:03.7073841
00:00:00.0003348
Difference = 11073.4292114695
https://ideone.com/A62JOn
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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