Reflector学习之特性理解

    [AttributeUsage(AttributeTargets.All,AllowMultiple= true,Inherited= false)]
    public class ForeignAttribute:System.Attribute
    {
        private string _languageType;

        private int _languageLevel;

        private string _languageInfo;

        //必须定义其构造函数，如果不定义 编译器提供无参默认构造函数
        public ForeignAttribute()
        { 
        
        }

        public ForeignAttribute(string languageType, int languagelevel)
        {
            _languageType = languageType;

            _languageLevel = languagelevel;
        
        }

        public string LanguageType
        {

            get { return _languageType == null ? string.Empty : _languageType; }
        }

        public int LanguageLevel
        {
            get { return _languageLevel; }
        }

        public string LanguageInfo
        {
            get { return _languageInfo; }

            set { _languageInfo = value; }
        
        }

        public void CanSpeak()
        {
            Console.WriteLine("He can speak {0}.", _languageType == null ? "Chinese Only" : _languageType);
        
        }
    }

 [ReflectorDemo.Foreign("English",8,LanguageInfo= "This is US English,but not England English")]
     public class LanguageTeacher
    {
        public void SayHello()
        {
            Console.WriteLine("Hello,I'm a Foreign Language teacher,I can speak Foreign Language.");
        }
    }

    //class Program
    //{
    //    static void Main(string[] args)
    //    {
    //        Type type = typeof(LanguageTeacher);

    //        System.Reflection.MemberInfo memberinfo = type;

    //        ReflectorDemo.ForeignAttribute can = (ReflectorDemo.ForeignAttribute)Attribute.GetCustomAttribute(memberinfo,typeof(ReflectorDemo.ForeignAttribute));

    //        if (can != null)
    //        {
    //            Console.WriteLine("Class of LanguageTeacher Can Speak:" + can.LanguageType);

    //            Console.WriteLine("The English Level of LanguageTeacher is:" + can.LanguageLevel);

    //            Console.WriteLine("And," + can.LanguageInfo);
    //        }

    //        //反射创建LanguageTeacher 对象，执行它的SayHello方法
    //        Object obj = Activator.CreateInstance(type);

    //        System.Reflection.MethodInfo mi = type.GetMethod("SayHello");

    //        mi.Invoke(obj, null);
        
        
    //    }
    
    //}

转自:http://www.cnblogs.com/cnliu/archive/2010/02/25/1673384.html