Code Sample - Observer Pattern

using System;
using System.Collections.Generic;

namespace ObserverPattern
{
  public interface IObserver
  {
    void Update(float temp, float humidity, float pressure);
  }

  public interface ISubject
  {
    void RegisterObserver(IObserver o);
    void RemoveObserver(IObserver o);
    void NotifyObservers();
  }

  public interface IDisplayElement
  {
    void Display();
  }


  public class WeatherSubject : ISubject
  {
    readonly List<IObserver> observers;
    float temperature;
    float pressure;
    float humidity;

    public void GetterMeasurements(float inTemperature, float inHumidity, float inPressure)
    {
      temperature = inTemperature;
      humidity = inHumidity;
      pressure = inPressure;
      NotifyObservers();
    }

    public WeatherSubject()
    {
      observers = new List<IObserver>();
    }
    #region ISubject Members

    public void RegisterObserver(IObserver o)
    {
      observers.Add(o);
    }

    public void RemoveObserver(IObserver o)
    {
      observers.Remove(o);
    }

    public void NotifyObservers()
    {
      foreach ( IObserver observer in observers )
      {
        observer.Update(temperature, humidity, pressure);
      }
    }

    #endregion
  }
}