[AttributeUsage (AttributeTargets.All ,AllowMultiple =true )] //这样这个属性可以重复在一个类上使用

    class CustomAttribute:Attribute

    {

        public CustomAttribute ()

        {

        }

        private string _Remark = "";

        public CustomAttribute (string remark)

        {

            this._Remark = remark;

        }

        public string Description { get; set; }

        public int Id;

        public void Log()

        {

            Console.WriteLine(this._Remark);

        }

        public delegate void DoDelegate();

        public event DoDelegate DoEvent;

    }

[Custom] //调用无参数的构造函数

[CustomAttribute()] //调用无参数的构造函数

[CustomAttribute("这里是我的测试")]//调用有参数的构造函数

[CustomAttribute("这里是Remark的",Description= "这里是Description")]//调用有参构造函数，给属性赋值

[CustomAttribute(Description = "这里是Description")]//调用无参构造函数，给属性赋值