C# observer – テックメモ

通常パターン。

using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            ConcreateObserver o = new ConcreateObserver();
            ConcreateSubject s = new ConcreateSubject();
            s.attach(o);
            s.notify();
        }
    }

    interface ISubject
    {
        void attach(IObserver o);
        void detach();
        void notify();
    }
    interface IObserver
    {
        void update(ISubject s);
    }

    class ConcreateSubject : ISubject
    {
        IObserver observer;

        public void attach(IObserver o)
        {
            observer = o;
        }
        public void detach()
        {
            observer = null;
        }
        public void notify()
        {
            observer.update(this);
        }
    }
    class ConcreateObserver : IObserver
    {
        public void update(ISubject s)
        {
            MessageBox.Show("");
        }
    }
}

using System.Windows.Forms;

namespace WindowsFormsApp1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

ConcreateObserver o = new ConcreateObserver();

ConcreateSubject s = new ConcreateSubject();

s.attach(o);

s.notify();

}

interface ISubject

{

void attach(IObserver o);

void detach();

void notify();

}

interface IObserver

{

void update(ISubject s);

}

class ConcreateSubject : ISubject

{

IObserver observer;

public void attach(IObserver o)

{

observer = o;

}

public void detach()

{

observer = null;

}

public void notify()

{

observer.update(this);

}

class ConcreateObserver : IObserver

{

public void update(ISubject s)

{

MessageBox.Show("");

}