C#泛型與非泛型性能比較的實例

代碼如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace ConsoleApplication
{
    class Program
    {
        static int length = 1000 * 1000;
        static void Main(string[] args)
        {
            int iteration=10;//方法執行次數
            CodeTimer.Time("值類型處理-泛型方法", iteration, Test1);
            CodeTimer.Time("值類型處理-非泛型方法", iteration, Test2);
            //CodeTimer.Time("引用類型處理-泛型方法", iteration, Test3);
            //CodeTimer.Time("引用類型處理-非泛型方法", iteration, Test4);
            Console.ReadKey();
        }
        /// <summary>
        /// 值類型泛型方法
        /// </summary>
        static  void Test1()
        {
            List<int> l = new List<int>();
            for (int i = 0; i < length; i++)
            {
                l.Add(i);
                int a = l[i];
            }
            l = null;
        }
        /// <summary>
        /// 值類型非泛型方法
        /// </summary>
        static void Test2()
        {
            ArrayList a = new ArrayList();
            for (int i = 0; i < length; i++)
            {
                a.Add(i);
                int s = (int)a[i];
            }
            a = null;
        }
        /// <summary>
        /// 引用類型泛型方法
        /// </summary>
        static void Test3()
        {
            List<string> l = new List<string>();
            for (int i = 0; i < length; i++)
            {
                l.Add("l");
                string s = l[i];
            }
        }
        /// <summary>
        /// 引用類型的非泛型方法
        /// </summary>
        static void Test4()
        {
            ArrayList a = new ArrayList();
            for(int i=0;i<length;i++)
            {
                a.Add("a");
                string s = (string)a[i];
            }
            a = null;
        }
    }
}

值類型的泛型與非泛型的性能比較，方法執行10次，由此可見 使用泛型要比非泛型的效率高很多。