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using System;
using System.Collections;
namespace Observer
{
static class Program
{
static void Main()
{
var subject = new ConcreteSubject();
subject.Attach(new ConcreteObserver(subject,"Observer 1"));
subject.Attach(new ConcreteObserver(subject,"Observer 2"));
subject.Attach(new ConcreteObserver(subject,"Observer 3"));
subject.SetState("STATE");
}
}
public abstract class SubjectBase
{
private ArrayList _observers = new ArrayList();
public void Attach(ObserverBase o)
{
_observers.Add(o);
}
public void Detach(ObserverBase o)
{
_observers.Remove(o);
}
public void Notify()
{
foreach (ObserverBase o in _observers)
{
o.Update();
}
}
}
public class ConcreteSubject : SubjectBase
{
private string _state;
public string GetState()
{
return _state;
}
public void SetState(string newState)
{
_state = newState;
Notify();
}
}
public abstract class ObserverBase
{
public abstract void Update();
}
public class ConcreteObserver : ObserverBase
{
private ConcreteSubject _subject;
private string _name;
public ConcreteObserver(ConcreteSubject subject, string name)
{
_subject = subject;
_name = name;
}
public override void Update()
{
string subjectState = _subject.GetState();
Console.WriteLine(_name + ": " +subjectState);
}
}
}
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My name is Robert Kanasz and I have been working with ASP.NET, WinForms and C# for several years.
MCSD - Web Applications
MCSE - Data Platform
MCPD - ASP.NET Developer 3.5
- Web Developer 4
MCITP - Database Administrator 2008
- Database Developer 2008
MCSA - SQL Server 2012
MCTS - .NET Framework 3.5, ASP.NET Applications
- SQL Server 2008, Database Development
- SQL Server 2008, Implementation and Maintenance
- .NET Framework 4, Data Access
- .NET Framework 4, Service Communication Applications
- .NET Framework 4, Web Applications
MS - Programming in HTML5 with JavaScript and CSS3 Specialist
Open source projects:
DBScripter - Library for scripting SQL Server database objects
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