C#（反射\特性）

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

namespace AttributeClassApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            Type helpType = typeof(GetHelp);

            //通过Type调用方法
            MethodInfo methodInfoOK = helpType.GetMethod("HelpMe");
            object obj = Activator.CreateInstance(helpType);
            methodInfoOK.Invoke(obj,null);

            //通过Type访问使用特性的对象
            MethodInfo[] methodInfos = helpType.GetMethods();
            Console.WriteLine("\n方法：");
            foreach (MethodInfo methodInfo in methodInfos)
            {
                Console.WriteLine(methodInfo.Name);
            }

            //通过Type访问类使用的特性
            Attribute[] attrs = Attribute.GetCustomAttributes(helpType);
            foreach (Attribute attr in attrs)
            {
                if (attr is HelpAttribute)
                {
                    HelpAttribute help = (HelpAttribute)attr;
                    Console.WriteLine(help.HelpInfo);
                }
            }

            //访问方法使用的特性
            Attribute attribute = Attribute.GetCustomAttribute(methodInfoOK, typeof(HelpAttribute));
            HelpAttribute helpme = (HelpAttribute)attribute;
            Console.WriteLine(helpme.HelpInfo);

            Console.Read();
        }
    }

    [Help("请帮一下我,我是你朋友！")]
    public class GetHelp
    {
        [Help("我还需要你的帮助！")]
        public void HelpMe()
        {
            Console.WriteLine("我听见有人要我帮忙，但不知道他是谁，也不知道要怎么做？");
        }
    }

    [AttributeUsage(AttributeTargets.Method|AttributeTargets.Class, AllowMultiple = true)]
    public class HelpAttribute : Attribute
    {
        private string helpInfo;

        public string HelpInfo
        {
            get { return helpInfo; }
            set { helpInfo = value; }
        }

        public HelpAttribute(string helpInfo)
        {
            this.helpInfo = helpInfo;
        }
    }

}