نموذج التصميم وزن الذبابة

public interface IFlyweight
    {
        void Load(string filename);
        void Display(PaintEventArgs e, int row, int col);
    }

public struct Flyweight : IFlyweight
    {
        // Intrinsic state
        Image pThumbnail;
        public void Load(string filename)
        {

                pThumbnail = new Bitmap(@"E:\wallpapers\" + filename).GetThumbnailImage(100, 100, null, new IntPtr());
        }

        public void Display(PaintEventArgs e, int row, int col)
        {
            e.Graphics.DrawImage(pThumbnail, col * 100 + 10, row * 130 + 40, pThumbnail.Width, pThumbnail.Height);
        }
    }

public class FlyweightFactory
    {
        // Keeps an indexed list of IFlyweight objects in existence
        Dictionary<string, IFlyweight> flyweights =new Dictionary<string, IFlyweight>();

        public FlyweightFactory()
        {
            flyweights.Clear();
           
        }

        public IFlyweight this[string index]
        {
            get
            {
                if (!flyweights.ContainsKey(index))
                    flyweights[index] = new Flyweight();
                return flyweights[index];
            }
        }
    }

   class Client
    {
        // Shared state - the images
        static FlyweightFactory album = new FlyweightFactory();
        // Unshared state - the groups
        static Dictionary<string, List<string>> allGroups = new Dictionary<string, List<string>>();
        public void LoadGroups()
        {
            var myGroups = new[] {
new {Name = "FirstGroup",
Members = new [] {"1.jpg", "2.jpg","3.jpg", "4.jpg"}},
new {Name = "SecondGroup",
Members = new [] {"5.jpg","6.jpg","7.jpg", "8.jpg"}},
new {Name = "ThirdGroup",
Members = new [] {"9.jpg", "10.jpg"}}

};
            // Load the Flyweights, saving on shared intrinsic state
            foreach (var g in myGroups)
            { // implicit typing
                allGroups.Add(g.Name, new List<string>());
                foreach (string filename in g.Members)
                {
                    allGroups[g.Name].Add(filename);
                    album[filename].Load(filename);
                }
            }
        }

        public void DisplayGroups(Object source, PaintEventArgs e)
        {
            // Display the Flyweights, passing the unshared state
            int row = 0;
            foreach (string g in allGroups.Keys)
            {
                int col = 0;
                e.Graphics.DrawString(g, new Font("Arial", 16), new SolidBrush(Color.Black), new PointF(0, row * 130 + 10));
                foreach (string filename in allGroups[g])
                {
                    album[filename].Display(e, row, col);
                    col++;
                }
                row++;
            }
        }
    }

public partial class Window : Form
    {

        public Window()
        {
            InitializeComponent(); 
            this.Height = 600;
            this.Width = 600;
            this.Text = "Picture Groups";
            Client client = new Client();
            client.LoadGroups();

            this.Paint+= new PaintEventHandler(client.DisplayGroups);

        }

        static void Main()
        {
            Application.Run(new Window());
        }

    }