C#的反射机制实例化并调用方法

using System;  
using System.Reflection;  
 
namespace Mengliao.CSharp.C13.S02  
{  
    class MyClass  
    {  
        private int count;  
 
        public MyClass(int value)  
        {  
            count = value;  
        }  
 
        public void m1()  
        {  
            Console.WriteLine("Called method 1.");  
        }  
 
        public static int m2(int x)  
        {  
            return x * x;  
        }  
 
        public void m3(int x, double y)  
        {  
            Console.WriteLine("Called method 3, paramaters: x = {0}, y = {1:E}.", x, y);  
        }  
 
        public void m4()  
        {  
            Console.WriteLine("Called method 4. Count = {0}", count);  
        }  
 
        private static string m5(double x) //私有静态方法，不能直接调用，但可以绑定到委托  
        {  
            return Math.Sqrt(x).ToString();  
        }  
    }  
 
    class Program  
    {  
        public static void Main()  
        {  
            //取得MyClass的Type对象，下面的代码使用Type的静态方法需指明程序集，作用相同  
            //Type t = Type.GetType("Mengliao.CSharp.C13.S02.MyClass, ConsoleApplication, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null");  
            Type t = typeof(MyClass);  
            //通过Activator实例化MyClass，供实例方法调用  
            //实例化
            //object obj = Activator.CreateInstance(t, null);
            object obj = Activator.CreateInstance(t, new object[] { 88 });  
 
            MethodInfo[] methods = t.GetMethods(); //获取MyClass的所有方法列表  
 
            foreach (MethodInfo nextMethod in methods) //枚举所有方法  
            {  
                Console.WriteLine(nextMethod.ToString()); //显示方法信息  
                if (nextMethod.Name == "m1") //方法m1  
                {  
                    nextMethod.Invoke(obj, null); //使用obj对象调用方法m1，无参数  
                }  
                if (nextMethod.Name == "m2") //方法m2  
                {  
                    //静态方法，使用null调用方法m2，建立参数数组，传入10  
                    Console.WriteLine("Called static method 2, return {0}", nextMethod.Invoke(null, new object[] { 10 }));  
                }  
            }  
 
            MethodInfo m3Info = t.GetMethod("m3"); //获取方法m3  
            m3Info.Invoke(obj, new object[] { 123, 0.456 }); //调用方法m3，传入对应的2个参数  
 
            //获取方法m4，使用obj对象调用方法，无参数  
            t.InvokeMember("m4", BindingFlags.InvokeMethod, null, obj, null);  
 
            //建立泛型委托runMe，并绑定MyClass的静态私有方法m5  
            Delegate runMe = Delegate.CreateDelegate(typeof(Func<double, string>), t, "m5");  
            Console.WriteLine("Call delegate with m5: Sqrt(2) = {0}", ((Func<double, string>)runMe)(2)); //调用该委托  
              
            Console.ReadLine();  
        }  
    }  
}