Class 创建性能测试

using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace ConsoleApplication5_Inject
{
    class Entity { }

    class Program
    {
        staticvoid Main(string[] args)
        {
            #region Run1
            Stopwatch sw =new Stopwatch();
            sw.Start();
            for (int i =0; i <100000; i++)
            {
                Run1();
            }
            sw.Stop();
            Console.WriteLine(sw.Elapsed.Milliseconds); 
            #endregion

            #region Run2
            sw =new Stopwatch();
            sw.Start();
            for (int i =0; i <100000; i++)
            {
                Run2();
            }
            sw.Stop();
            Console.WriteLine(sw.Elapsed.Milliseconds); 
            #endregion

            #region Run3
            sw =new Stopwatch();
            sw.Start();
            for (int i =0; i <100000; i++)
            {
                Run3();
            }
            sw.Stop();
            Console.WriteLine(sw.Elapsed.Milliseconds); 
            #endregion

            #region Run4
            sw =new Stopwatch();
            sw.Start();
            for (int i =0; i <100000; i++)
            {
                Run4<Entity>();
            }
            sw.Stop();
            Console.WriteLine(sw.Elapsed.Milliseconds);
            #endregion

            Console.ReadKey();
        }

        staticvoid Run1()
        {
            new Entity();
        }

        staticvoid Run2()
        {
            Activator.CreateInstance(typeof(Entity));
        }

        staticvoid Run3()
        {
            Activator.CreateInstance<Entity>();
        }

        staticvoid Run4<T>() where T : new()
        {
            new T();
        }
    }
}

跑10万次 结果:

1. 3ms

2. 220ms

3. 117ms

4. 121ms