C # Delegate base 2--multi-way delegate

C # commissioned the basic series was originally published in February 2011 in my Sina blog, now it will be like this blog.

Multi-Channel delegation

Class Program {public delegate void Saythingtos (string s);
        void SayHello (String s) {Console.WriteLine ("Hello {0}", s);
        } void Saygoodbye (String s) {Console.WriteLine ("Goodbye {0}", s);
            } static void Main (string[] args) {//mode one Saythingtos say1, Say2, Say3, Say4;
            Program P = new program ();
            Say1 = P.sayhello; Say1 ("XY");
            Hello xy say2 = P.saygoodbye; Say2 ("XY");
            Goodbye xy say3 = say1 + say2; Say3 ("XY");
            Hello xy, bye xy say4 = say3-say1; Say4 ("XY");
            Goodbye XY//mode two saythingtos S1 = new Saythingtos (P.sayhello);
            S1 + = new Saythingtos (P.saygoodbye); S1 ("XY");
            Hello xy, bye xy saythingtos s2 = new Saythingtos (P.sayhello);           
            S2 + = new Saythingtos (P.saygoodbye); S2-= new SaythingtOS (P.sayhello); S2 ("XY");

 Goodbye XY}}

This article refers to the content of the agent from Jin Xu-liang's ". NET 4.0 object-oriented Programming"