Observer_Class.cs

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using System;
using System.Text;
 
namespace DesignPatternExamples_csharp
{
    public class ObserverForDecimal : IObserverNumberChanged
    {
        private INumberProducer _numberProducer;
 
 
        public ObserverForDecimal(INumberProducer numberProducer)
        {
            if (numberProducer == null)
            {
                throw new ArgumentNullException("numberProducer", "The ObserverForDecimal constructor requires a valid INumberProducer object.");
            }
            _numberProducer = numberProducer;
        }
 
        void IObserverNumberChanged.NumberChanged()
        {
            uint number = _numberProducer.FetchNumber();
            Console.WriteLine("    Decimal    : {0}", number);
        }
    }
 
 
    //########################################################################
    //########################################################################
 
 
    public class ObserverForHexaDecimal : IObserverNumberChanged
    {
        INumberProducer _numberProducer;
 
        public ObserverForHexaDecimal(INumberProducer numberProducer)
        {
            if (numberProducer == null)
            {
                throw new ArgumentNullException("numberProducer", "The ObserverForHexaDecimal constructor requires a valid INumberProducer object.");
            }
            _numberProducer = numberProducer;
        }
 
 
        void IObserverNumberChanged.NumberChanged()
        {
            uint number = _numberProducer.FetchNumber();
            Console.WriteLine("    Hexadecimal: 0x{0:X8}", number);
        }
    }
 
 
    //########################################################################
    //########################################################################
 
 
    public class ObserverForBinary : IObserverNumberChanged
    {
        INumberProducer _numberProducer;
 
        public ObserverForBinary(INumberProducer numberProducer)
        {
            if (numberProducer == null)
            {
                throw new ArgumentNullException("numberProducer", "The ObserverForBinary constructor requires a valid INumberProducer object.");
            }
            _numberProducer = numberProducer;
        }
 
 
        void IObserverNumberChanged.NumberChanged()
        {
            uint number = _numberProducer.FetchNumber();
            StringBuilder output = new StringBuilder();
            uint mask = (uint)1 << 31;
 
            for (uint index = 0; index < 32; ++index)
            {
                if ((number & mask) != 0)
                {
                    output.Append("1");
                }
                else
                {
                    output.Append("0");
                }
                mask >>= 1;
            }
 
            Console.WriteLine("    Binary     : {0}", output);
        }
    }
}