C # event mechanism

namespacetest{classPublisher//Publishing House    {         Public Delegate voidPubcomputer (stringMagazinename);//Proxy required to declare an event         Public Delegate voidPublife (stringmagazinename);  Public EventPubcomputer Onpubcomputer;//The nature of the event's declarative event is a chain of delegates         Public EventPublife Onpublife;  Public voidIssuecomputer ()//ways to trigger events        {            if(Onpubcomputer! =NULL) {Console.WriteLine ("issue of Computer publications"); Onpubcomputer ("Programming Guide"); }        }         Public voidIssuelife () {if(onpublife!=NULL) {Console.WriteLine ("Distribution of Life publications"); Onpublife ("Furniture"); }        }    }    classSubsriber//subscribed by    {        Private stringname;  PublicSubsriber (stringname) {             This. Name =name; }         Public voidReceive (stringMagazinename)//to define an event handler in an event subscriber{Console.WriteLine (name+"have received"+magazinename); }    }    classStory {Static voidMain () {Publisher pub=NewPublisher (); Subsriber ZS=NewSubsriber ("Zhang San"); Pub. Onpubcomputer+=NewPublisher.pubcomputer (ZS. Receive);//Subscribe an event to an event publisherSubsriber ls =NewSubsriber ("John Doe"); Pub. Onpubcomputer+=Newpublisher.pubcomputer (LS.            Receive); Pub. Onpublife+=Newpublisher.publife (LS.            Receive); Pub.issuecomputer ();//Triggering EventsPub.issuelife ();            Console.WriteLine (); Console.WriteLine ("a year later"); Pub. Onpubcomputer-=Newpublisher.pubcomputer (LS.            Receive); Pub.issuecomputer ();//Triggering EventsPub.issuelife (); }    }}

C # event mechanism