DIY๐DEV

Delegate with a simple example.

Delegate with a simple example. Ref This link!

using System;

class clsDelegate

{

       public delegate int simpleDelegate (int a, int b);

       public int addNumber(int a, int b)

        {

               return (a+b);

        }

        public int mulNumber(int a, int b)

        {

            return (a*b);

        }

        static void Main(string[] args)

        {

            clsDelegate clsDlg = new clsDelegate();

            simpleDelegate addDelegate = new simpleDelegate(clsDlg.addNumber);

            simpleDelegate mulDelegate = new simpleDelegate(clsDlg.mulNumber);

            int addAns = addDelegate(10,12);

            int mulAns = mulDelegate(10,10);

            Console.WriteLine(“Result by calling the addNum method using a delegate: {0}”,addAns);

            Console.WriteLine(“Result by calling the mulNum method using a delegate: {0}”,mulAns);

            Console.Read();

        }

}

using System;  

delegate void MyDelegate(string s);  

class MyClass 

{ 

    public static void Hello(string s) 

    { 

        Console.WriteLine(“  Hello, {0}!”, s); 

    } 

 

    public static void Goodbye(string s) 

    { 

        Console.WriteLine(“  Goodbye, {0}!”, s); 

    } 

 

    public static void Main() 

    { 

        MyDelegate a, b, c, d;   

 

        a = new MyDelegate(Hello);

        b = new MyDelegate(Goodbye);

       c = a + b; // call ทั้ง 2 method 

        d = c – a; // เหลือ call b method เดียว  

        Console.WriteLine(“Invoking delegate a:”);  a(“A”);        

        Console.WriteLine(“Invoking delegate b:”);  b(“B”); 

        Console.WriteLine(“Invoking delegate c:”);  c(“C”);        

        Console.WriteLine(“Invoking delegate d:”);  d(“D”);   

    } 

}

//======OutPut=====

//Invoking delegate a:

//Hello, A!

//Invoking delegate b:

//GoodBye, B!

//Invoking delegate c:

//Hello, C!

//GoodBye, C!

//Invoking delegate d:

//GoodBye, D!

Ref: ที่นี่ครับบทความดีๆอีกเยอะเลย TwoGuRU

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