Net反射效率（转载）

转载地址：http://blog.csdn.net/zheng_/archive/2010/03/04/5344472.aspx

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Reflection;

 

namespace TestAssembly
{
    public class TestClass : ITestInterface
    {
        public TestClass() { }
        public double TestMethod(double param)
        {
            return param * 0.75;
        }
    }

 

    public interface ITestInterface
    {
        double TestMethod(double param);
    }

 

    class Program
    {
        public static void Main(string[] args)
        {
            int n = 1000;
            Test1(n);//直接调用
            Test2(n);//通过InvokeMember调用
            Test3(n);//通过接口调用
            Test4(n);//绑定至delegate
            Console.In.ReadLine();
        }

 

        public delegate double TestDelegate(double param);

 

        //首先，写代码测量直接运行的效率，代码如下：
        static void Test1(int n)
        {
            TestClass tc = new TestClass();
            DateTime startTime = DateTime.Now;
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    tc.TestMethod(1.0);
            TimeSpan ts = DateTime.Now - startTime;
            Console.Out.WriteLine("Test1: " + ts);
        }

 

        //接着是通过InvokeMember调用，代码如下：
        static void Test2(int n)
        {
            Type testType = typeof(TestClass);
            object obj = testType.InvokeMember(null,BindingFlags.CreateInstance, null, null, null);
            DateTime startTime = DateTime.Now;
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    testType.InvokeMember("TestMethod", BindingFlags.InvokeMethod, null, obj, new object[] { 1.0 });
            TimeSpan ts = DateTime.Now - startTime;
            Console.Out.WriteLine("Test2: " + ts);
        }

 

        //然后，是将获得的object用接口来引用，然后调用方法，代码如下：
        static void Test3(int n)
        {
            Type testType = typeof(TestClass);

 

            object obj = testType.InvokeMember(null,BindingFlags.CreateInstance, null, null, null);

 

            ITestInterface instance = (ITestInterface)obj;

 

            DateTime startTime = DateTime.Now;
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    instance.TestMethod(1.0);
            TimeSpan ts = DateTime.Now - startTime;
            Console.Out.WriteLine("Test3: " + ts);
        }

 

        static void Test4(int n)
        {
            Type testType = typeof(TestClass);
            object obj = testType.InvokeMember(null,BindingFlags.CreateInstance, null, null, null);

 

            TestDelegate testMethod = (TestDelegate)Delegate.CreateDelegate(typeof(TestDelegate), obj, "TestMethod");

 

            DateTime startTime = DateTime.Now;
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    testMethod(1.0);
            TimeSpan ts = DateTime.Now - startTime;
            Console.Out.WriteLine("Test4: " + ts);
        }
    }
}

 

Test1，Test2，Test3，Test4比较效果。