C# 泛型集合

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比較泛型集合和非泛型集合在運行中的效率:

using System;using System.Collections;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ListDemo{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("開始測試ArrayList:");            TestBegin();            TestArrayList();            TestEnd();            Console.WriteLine("開始測試List<T>:");            TestBegin();            TestGenericList();            TestEnd();            Console.Read();        }        static int collectionCount = 0;        static Stopwatch watch = null;        private static int testCount = 10000000;        static void TestBegin()        {            GC.Collect();//強制對所有代碼進行即時記憶體回收            GC.WaitForPendingFinalizers();//掛起線程,執行終結器隊列中的終結器(析構方法)            GC.Collect();//再次對所有代碼進行記憶體回收,主要包括從終結器隊列中出來的對象            collectionCount = GC.CollectionCount(0);//返回在0代中執行的記憶體回收次數            watch = new Stopwatch();            watch.Start();        }        static void TestEnd()        {            watch.Stop();            Console.WriteLine("耗時:" + watch.ElapsedMilliseconds);            Console.WriteLine("記憶體回收次數:"+(GC.CollectionCount(0)-collectionCount));        }        static void TestArrayList()        {            ArrayList al = new ArrayList();            int temp = 0;            for (int i = 0; i < testCount; i++)            {                al.Add(i);                temp = (int) al[i];            }            al = null;        }        static void TestGenericList()        {            List<int> listT = new List<int>();            int temp = 0;            for (int i = 0; i < testCount; i++)            {                listT.Add(i);                temp = listT[i];            }            listT = null;        }    }}

如果集合的數目固定並且不涉及轉型,使用數組效率高否則就使用List<T>.

 

C# 泛型集合