C # Delegate Events

　　

1 namespaceConsoleApplication62 {3     class Program4     {5         Static voidMain (string[] args)6         {   7             //instantiating delegate Classes8MYAPP app=NewMyApp ();9             //the method to be executed by the event bindingTenApp. Presskeyboard + =Stratrun; One              while(true) A             { -                 //declare the value of the keyboard pressed -                 intOnKey; the                 //try converting the string that is pressed by the keyboard to the int number type. Failed to return 0; -                 int. TryParse (Console.ReadLine (), outOnKey); -                 //the method that triggered the event (the total number of incoming and keyboard pressed values) - app. Onpresskeyboard (app. Count,onkey); +                 //Print Total Value -Console.WriteLine ("The total value is:"+app. Count); +             } A             at  -         } -         /// <summary> -         ///To create an execution method -         /// </summary> -         /// <param name= "Count" ></param> in         /// <param name= "num" ></param> -         /// <returns></returns> to         Static intStratrun (intCountintnum) = + count +num; +  -     } the     /// <summary> *     ///The first step declares the delegate $     /// </summary>Panax Notoginseng     /// <param name= "Count" >Total before calculation</param> -     /// <param name= "num" >Digital</param> the     /// <returns>the total number after calculation</returns> +      Public Delegate intPresskeyboardeventhandler (intCountintnum); A  the      Public classMyApp +     {    -         /// <summary> $         ///Total $         /// </summary> -          Public intCount =0; -         //The second step declares the event instantiation delegate the          Public EventPresskeyboardeventhandler Presskeyboard; -         /// <summary>Wuyi         ///Create a method trigger event the         /// </summary> -         /// <param name= "Count" ></param> Wu         /// <param name= "num" ></param> -         /// <returns></returns> About          Public Virtual voidOnpresskeyboard (intCountintnum) $         { -             varInvoke = Presskeyboard?. Invoke (count, num); -             if(Invoke! =NULL) -             { ACount = (int) invoke; +             } the         } -     } $}

//delegate is a type. 
the//event is an instance of a delegate. 

//1. Declaring a delegate
//2, declaring an event instantiation delegate
//3. Creating a method to trigger events
//4. Creating a binding method for event execution
//5. Instantiating the class of the delegate
//6. Bind the method that triggered the event to the event
//7. Executing a Trigger event method

C # Delegate Events