Attribute 实例

下面会弹2个对话框
A方法是特别的X方法
B方法是普通的方法

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Reflection;

namespace WindowsFormsApplication14
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            foreach (MethodInfo MI in this.GetType().GetMethods())
            {
                bool Special = false;

                foreach (Attribute Attrib in MI.GetCustomAttributes(true))
                    if (MI.Name == "A")
                        if (Attrib is XAttribute)
                        {
                            Special = true;
                            break;
                        }
                if (Special)
                    MessageBox.Show(MI.Name + "方法是特别的X方法");
                else if (MI.Name == "B") // 因为其他普通的方法太多，这里就显示B
                    MessageBox.Show(MI.Name + "方法是普通的方法");
            }
        }

        [X]
        public void A()
        {
        }

        public void B()
        {
        }

        [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
        public class XAttribute : Attribute
        {
            public XAttribute()
            {
            }
        }
    }
}