C# attribute属性的例子

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Reflection;namespace ConsoleApplication1{    //输出student类定义上的attribute信息和student的属性和方法上的attribute定义信息    [AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = true)]    class StudentAttribute : Attribute    {        public StudentAttribute() { } //構造函數        private string name;        private int age;        private string privilege;        private string description;        /// <summary>        /// 姓名        /// </summary>        public string Name        {            get { return name; }            set { name = value; }        }        /// <summary>        /// 年齡        /// </summary>        public int Age        {            get { return age; }            set { age = value; }        }        /// <summary>        /// 優先級        /// </summary>        public string Privilege        {            get { return privilege; }            set { privilege = value; }        }        /// <summary>        /// 描述        /// </summary>        public string Description        {            get { return description; }            set { description = value; }        }    }    [Student(Name = "Locus", Age = 29)]    class Student    {        //private类型的属性不能读取        [Student(Description = "studentName")]        private string Name;        private string stuClass;        //为属性添加说明               [Student(Description = "studentClass", Name = "studentClass1")]        public string StuClass        {            get { return stuClass; }            set { stuClass = value; }        }        [Student(Description = "studentRead")] //为方法添加说明        public void ReadBook()        {            Console.WriteLine("Student read book");        }    }    class Program    {        static object[] objs;        static StudentAttribute sat;        static void Main(string[] args)        {                       var attrs = typeof(Student).GetCustomAttributes(typeof(StudentAttribute), true);            Console.WriteLine((attrs[0] as StudentAttribute).Age);            Console.WriteLine((attrs[0] as StudentAttribute).Name);                                    PropertyInfo[] propArray = null;            MethodInfo[]  methodArray=null;            propArray = typeof(Student).GetProperties();            methodArray=typeof(Student).GetMethods();            if (propArray.Length <= 0)                Console.WriteLine("None PropertyInfo");            else            foreach (PropertyInfo prop in propArray)            {                objs = prop.GetCustomAttributes(false);                for (int i = 0; i < objs.Length; i++)                {                    sat = (StudentAttribute)objs[i];                    Console.WriteLine(sat.Description);                                   }            }            if (methodArray.Length <= 0)                Console.WriteLine("None MethodInfo");            else                foreach (MethodInfo method in methodArray)                {                    objs = method.GetCustomAttributes(false);                    for (int i = 0; i < objs.Length; i++)                    {                        if (objs[i] is StudentAttribute)                        {                            sat = (StudentAttribute)objs[i];                            Console.WriteLine(method.Name);                            Console.WriteLine(sat.Description);                        }                    }                }            if (typeof(Student).IsDefined(typeof(StudentAttribute),true))            {                Console.WriteLine("使用了StudentAttribute属性");             }            Console.ReadLine();          }    }}