Event委托

    public class ArgButton:Button
    {
        public delegate void OnArgClick(btnEventArgs e);

        public event OnArgClick ArgClick;

        private string Args
        {
            get;
            set;
        }

        public ArgButton()
        { }

        public ArgButton(string args)
        {
            this.Args = args;
            this.Click += new EventHandler(ArgButton_Click);
        }

        void ArgButton_Click(object sender, EventArgs e)
        {
            if (ArgClick != null)
            {
                ArgClick(new btnEventArgs(Args));
            }
        }
    }

    public class btnEventArgs:EventArgs
    {
        private string args;
        public btnEventArgs(string args)
        {
            this.args = args;
        }

        public string Args
        {
            get { return this.args; }
        }
    }