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  1. using System;
  2. using static System.Console;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5. using System.Diagnostics;
  6.  
  7. public class Program {
  8.     public static void Main() {
  9. 		Executa(CriarCompras1);
  10. 		Executa(CriarCompras2);
  11. 		Executa(CriarCompras3);
  12. 		Executa(CriarCompras4);
  13. 		Executa(CriarCompras5);
  14. 		Executa(CriarCompras6);
  15. 	}
  16.     public static void Teste() => WriteLine("Fazendo algo aqui");
  17.  
  18. 	private static void Executa(Func<int, List<Compra>> metodo) {
  19.         var stopwatch = new Stopwatch();
  20.         stopwatch.Start();
  21.         for (var i = 0; i < 1000; i++) metodo(50);
  22.         stopwatch.Stop();
  23. 		WriteLine($"Tempo passado: {stopwatch.ElapsedTicks}");
  24. 	}
  25.  
  26. 	private static List<Compra> CriarCompras1(int numComprasParaGerar) => new List<Compra>(Enumerable.Range(0, numComprasParaGerar).Select(i => new Compra()));
  27.  
  28. 	private static List<Compra> CriarCompras2(int numComprasParaGerar) => new int[numComprasParaGerar].Select(i => new Compra()).ToList();
  29.  
  30. 	private static List<Compra> CriarCompras3(int numComprasParaGerar) => (from i in new int[numComprasParaGerar] select new Compra()).ToList();
  31.  
  32. 	private static List<Compra> CriarCompras4(int numComprasParaGerar) => new List<Compra>(Enumerable.Range(0, numComprasParaGerar).Select(i => new Compra()));
  33.  
  34. 	private static List<Compra> CriarCompras5(int numComprasParaGerar) {
  35. 		var lstCompras = new List<Compra>();
  36. 		CriarCompras(lstCompras, numComprasParaGerar);
  37. 		return lstCompras;
  38. 	}
  39.  
  40. 	private static void CriarCompras(List<Compra> lstCompras, int numComprasParaGerar) {
  41. 	   lstCompras.Add(new Compra());
  42. 	   if(lstCompras.Count < numComprasParaGerar) CriarCompras(lstCompras, numComprasParaGerar);
  43. 	}
  44.  
  45. 	private static List<Compra> CriarCompras6(int numComprasParaGerar)	{
  46. 		List<Compra> lstCompras = new List<Compra>(numComprasParaGerar);
  47. 		for (int i = 0; i < numComprasParaGerar; i++) lstCompras.Add(new Compra());
  48. 		return lstCompras;
  49. 	}
  50. }
  51.  
  52. public class Compra {
  53. 	public int Item = 0;
  54. }
  55.  
  56. //https://pt.stackoverflow.com/a/89648/101
Success #stdin #stdout 0.03s 22692KB
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Standard input is empty
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Tempo passado: 71276
Tempo passado: 22273
Tempo passado: 10695
Tempo passado: 25859
Tempo passado: 13716
Tempo passado: 8771
https://ideone.com/pkjMu2
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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