Najam Sikander Awan

covering web stack along with microsoft technologies

Observer Pattern With .net

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Hi folks,

Well I am investigating design patterns by reading an article so after reading a bit I thought it would be nice if I write some code and test it.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
class Program
{
/// <summary>
/// Product Class
/// </summary>
public class Product
{
public delegate void NameChangeEventHandler(int a);
public event NameChangeEventHandler NameChanged;
private string _name;
public string Name
{
get
{
return _name;
}
set
{
_name = value;
if (NameChanged != null)
{
NameChanged(5);
}
}
}

public Product(string name)
{
Name = name;
}
public void PrintName()
{
Console.WriteLine("ProductName={0}", Name);
}
}

/// <summary>
/// Test Class
/// </summary>
public class Test
{
public Test(Product P)
{
P.NameChanged += new Product.NameChangeEventHandler(ChangeDetected);
}
public void ChangeDetected(int a)
{
Console.WriteLine("change found,argument passed is {0}",a);
}

}

static void Main(string[] args)
{
Product p = new Product("najam awan");
p.PrintName();
Test t = new Test(p);
p.Name = "najaf awan";
p.PrintName();
Console.ReadKey();

}
}
}

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