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  1. using System;
  2. using System.IO;
  3. using System.Reflection;
  4. using System.Diagnostics;
  5. using System.Globalization;
  6. using System.Collections.Generic;
  7. using System.Runtime.Serialization.Formatters.Binary;
  8.  
  9. public class Test
  10. {
  11.     [Serializable]
  12.     public class DataItem
  13.     {
  14.         public Int32 Property1 { get; set; }
  15.         public String Property2 { get; set; }
  16.         public Int32 Property3 { get; set; }
  17.     }
  18.     public static void Main()
  19.     {
  20.         DataItem[] items = CreateTestData(Int32.Parse(Console.ReadLine()));
  21.  
  22.         Measure("Serialize",
  23.             delegate
  24.             {
  25.                 DataItem[] items2 = Clone(items);
  26.             });
  27.         Measure("Reflection",
  28.             delegate
  29.             {
  30.                 DataItem[] items3 = CopyProperties<DataItem, DataItem>(items);
  31.             });
  32.     }
  33.     static DataItem[] CreateTestData(Int32 count)
  34.     {
  35. 		Random rnd = new Random();
  36. 		DataItem[] result = new DataItem[count];
  37. 		for(Int32 loop = 0; loop < count; loop++)
  38. 		{
  39. 			result[loop] = new DataItem();
  40. 			result[loop].Property1 = rnd.Next();
  41. 			result[loop].Property2 = rnd.Next().ToString();
  42. 			result[loop].Property3 = rnd.Next();
  43. 		}
  44. 		return result;
  45. 	}
  46.     static T Clone<T>(T target)
  47.     {
  48.         using(MemoryStream stream = new MemoryStream())
  49.         {
  50.             BinaryFormatter formatter = new BinaryFormatter();
  51.             formatter.Serialize(stream, target);
  52.             stream.Position = 0;
  53.             T result = (T)formatter.Deserialize(stream);
  54.             return result;
  55.         }
  56.     }
  57.     static void CopyProperties<S, T>(S source, T target) where T : class
  58.     {
  59.         Type type = typeof(T);
  60.         PropertyInfo[] properties = source.GetType().GetProperties();
  61.         foreach(PropertyInfo property in properties)
  62.         {
  63.             PropertyInfo targetProperty = type.GetProperty(property.Name);
  64.             if(targetProperty != null)
  65.                 targetProperty.SetValue(target, property.GetValue(source, null), null);
  66.         }
  67.     }
  68.     static T[] CopyProperties<S, T>(S[] source) where T : class, new()
  69.     {
  70.         if(source == null)
  71.                 throw new ArgumentNullException("source");
  72.  
  73.         T[] result = new T[source.Length];
  74.         for(Int32 loop = 0; loop < source.Length; loop++)
  75.         {
  76.                 result[loop] = new T();
  77.                 CopyProperties(source[loop], result[loop]);
  78.         }
  79.         return result;
  80.     }
  81.     static void Measure(String message, Action method)
  82.     {
  83.         Int64 mem = GC.GetTotalMemory(true);
  84.         Int64 gcCount = GC.CollectionCount(0);
  85.  
  86.         DateTime now = DateTime.Now;
  87.         Stopwatch stopwatch = Stopwatch.StartNew();
  88.         method();
  89.         TimeSpan elapsed = stopwatch.Elapsed;
  90.  
  91.         // DONTTOUCH:
  92.         //  It is intended to call GetTotalMemory with forceFullCollection: false
  93.         //  before CollectionCount call.
  94.         Double tempMemDelta = Math.Max(GC.GetTotalMemory(false) - mem, 0);
  95.         Int64 gcCountDelta = GC.CollectionCount(0) - gcCount;
  96.  
  97.         String elapsedString = elapsed.TotalSeconds.ToString("00.0000", CultureInfo.InvariantCulture);
  98.         String memDeltaInKb = (tempMemDelta / 1024).ToString("0.00 KB", CultureInfo.InvariantCulture);
  99.  
  100.         Console.WriteLine(@"{0}: 
  101. Elapsed: {1} s,  MemDelta: {2,10},  GC count: {3}
  102. ", message, elapsedString, memDeltaInKb, gcCountDelta);
  103.     }
  104. }
Success #stdin #stdout 0.15s 34416KB
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stdin
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100
stdout
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Serialize: 
Elapsed: 00.0851 s,  MemDelta:  156.00 KB,  GC count: 1

Reflection: 
Elapsed: 00.0079 s,  MemDelta:    8.00 KB,  GC count: 0
https://ideone.com/XF1c2u
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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