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Delegates - A simple way


Posted Date: 03 Aug 2008    Resource Type: Code Snippets    Category: Console Applications

Posted By: Gaurav Arora       Member Level: Gold
Rating:     Points: 10



This is a simple example to write a delegate. It simply counts the number, but it tells you the simplicity of delegates, just go-thorugh the code-snippet and comment it out.

The way to define is :

Counter MyCounter = new Counter();
EvenNumberHandlerClass MyEvenNumberHandlerClass = new
EvenNumberHandlerClass();
MyCounter.OnEvenNumber += new
EvenNumberHandler(MyEvenNumberHandlerClass.EvenNumberFound);


Here is a complete code-snippet :

/* This Example is a part of different
* examples shown in Book:
* C#2005 Beginners: A Step Ahead
* Written by: Gaurav Arora
* Reach at : gaurav.aroraose@yahoo.co.in */

// File name : delegateevents.cs

namespace CSharp.AStepAhead.delegateevents
{

using System;

public delegate void EvenNumberHandler(int Number);
class Counter
{
public event EvenNumberHandler OnEvenNumber;
public Counter()
{
OnEvenNumber = null;
}
public void CountTo100()
{
int CurrentNumber;
for(CurrentNumber = 0; CurrentNumber <= 100; CurrentNumber++)
{
if(CurrentNumber % 2 == 0)
{
if(OnEvenNumber != null)
{
OnEvenNumber(CurrentNumber);
}
}
}
}
}
class EvenNumberHandlerClass
{
public void EvenNumberFound(int EvenNumber)
{
Console.WriteLine(EvenNumber);
}
}
class MainClass
{
public static void Main()
{
Counter MyCounter = new Counter();
EvenNumberHandlerClass MyEvenNumberHandlerClass = new
EvenNumberHandlerClass();
MyCounter.OnEvenNumber += new
EvenNumberHandler(MyEvenNumberHandlerClass.EvenNumberFound);
MyCounter.CountTo100();
Console.ReadLine();
}
}
}




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