using System;
using System.Collections.Generic;
using System.Diagnostics;
namespace TestListArrayPerformance
{
class Program
{
static void Main(string[] args)
{
//const int COUNT = 1000;
const int COUNT = 10000000;
//Test string's performance
//string[] array = new string[COUNT]; // Volumn is predefined
//Test integers' performance
int[] array = new int[COUNT]; // Volumn is predefined
//Test string's performance
//List<string> list = new List<string>(); // Volumn is changable
//Test integers' performance
List<int> list = new List<int>(); // Volumn is changable
Console.WriteLine("The count of the elements is: {0}. \n", COUNT);
Console.Write("Total time cost for an Array initialization is: ");
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
for (int i = 0; i < COUNT; i++)
{
//Test string's performance
//array[i] = i.ToString();
//Test integers' performance
array[i] = i;
}
stopWatch.Stop();
Console.Write(stopWatch.ElapsedMilliseconds.ToString() + "ms.");
stopWatch.Reset();
stopWatch.Start();
Console.WriteLine("\n");
for (int i = 0; i < COUNT; i++)
{
//Test string's performance
//list.Add(i.ToString());
//Test integers' performance
list.Add(i);
}
stopWatch.Stop();
Console.Write("Total time cost for a List initialization is: ");
Console.Write(stopWatch.ElapsedMilliseconds.ToString() + "ms.");
stopWatch.Reset();
Console.ReadKey();
}
}
}
結論
- 在資料量龐大的時候List的性能比Array的性能低;
- 在資料量較小的時候List的性能和Array的性能基本上差不多;
- 在資料量小或者長度不可知的情況下推薦使用List,因為其長度是可變的;
- 在資料量大或者資料量的長度明确的情況下推薦使用Array,因為這樣可以提高性能。
相關連結
List源碼
Array源碼