Ding Jie Niu: viewing delegation and events (continued) Ding Jie Niu-in-depth analysis of delegation and events

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 Using  System;  Using  System. Collections. Generic;  Using  System. LINQ;  Using  System. text;  Using  System. Threading;  Namespace  Callchange {  Public  Class  Call {  Static   Void Main ( String  [] ARGs) {messagemonitoring mm = New  Messagemonitoring ();  //  Add the response function of the listener event Mm. onvaluechange + = New Mmeventhandle (S, e) => {Console. writeline (E. Value) ;}); mm. Run ();}} //  Parameter E      Public   Class  Mmeventargs: eventargs {  Public   Int Value { Get ; Set  ;}}  Public   Delegate   Void Mmeventhandle ( Object  Sender, mmeventargs E ); //  Information Monitoring class. When the value changes, the onvaluechange event is triggered.      Public   Class  Messagemonitoring {  Public   Event  Mmeventhandle onvaluechange;  Private   Int  _ Value;  Public   Void  Run () {thread = New Thread () => {  While ( True  ) {Thread. Sleep (  1000  ); ++ Value ;}}); thread. Start ();}  //  Attribute change          Public   Int  Value {  Get {Return  _ Value ;}  Set  {  If (_ Value! = Value) {_ value = Value;  If (Onvaluechange! = Null  ) {Onvaluechange (  This , New Mmeventargs {value = _ value}) ;}}}}