Delegates and events

First, click the Saywords button, directly trigger events, display data

Second, start editing the event code, where a Jiafang class and a message (the owning EventArgs, the event argument) are created to encapsulate the properties

1, the Jiafang classnamespacedelegate and event again_and_again{//create a class of party a      Public classJiafang {//Add members to party a        Private string_word;  Public stringWord {Get{return_word;} Set{_word =value;} }        Private string_name;  Public stringName {Get{return_name;} Set{_name =value;} }         //Define an event         Public EventWeituohandler events; //define a function to trigger this event         Public voidsaywords () {if(events!=NULL) {Events ( This,NewMessage () {word="I am party a"}); }        }             }}2, the class of messagenamespacedelegate and event again_and_again{ Public classMessage:eventargs {Private string_word;  Public stringWord {Get{return_word;} Set{_word =value;} }    }}3, Eventsnamespacedelegate and event again_and_again{//define a delegate     Public Delegate voidWeituohandler (Objecta,message msg);  Public Partial classForm1:form {Jiafang x;  PublicForm1 () {InitializeComponent (); X=NewJiafang (); X.name="Party"; Label1. Text=X.name; X.events+ = x_events;//x-click events        }        voidX_events (ObjectA, message msg) {TextBox1.Text="who are you ?"; TextBox1.Text+="\ t"+Msg.        Word; }        Private voidButton1_Click (Objectsender, EventArgs e)//saywords Button{x.saywords ();//trigger function, function to raise event        }    }}

Delegates and events