CSharp: Proxy Pattern

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/// <summary> /// Proxy Patterns 代理模式 ///20220918 /// geovindu,Geovin Du,涂聚文 /// </summary> public interface DuImager {     Image getImage(); }

　　

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/// <summary>    /// Proxy Patterns 代理模式    ///20220918    /// geovindu,Geovin Du,涂聚文    /// </summary>    public  class QuickImage:DuImager    {          /// <summary>        ///        /// </summary>        public QuickImage() { }        /// <summary>        /// Box.gif        /// </summary>        /// <returns></returns>        public Image getImage()        {            return new Bitmap("flowrtree.jpg");  //flowrtree.jpg        }    }

　　

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/// <summary>    /// Proxy Patterns 代理模式    ///20220918    /// geovindu,Geovin Du,涂聚文    /// </summary>     public class FinalImage:DuImager    {         /// <summary>         ///         /// </summary>        public FinalImage() { }           /// <summary>         ///         /// </summary>         /// <returns></returns>        public Image getImage()        {            return new Bitmap("flowrtree.jpg");        }    }

　　

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/// <summary>    /// Proxy Patterns 代理模式    ///20220918    /// geovindu,Geovin Du,涂聚文    /// </summary>    public  class ImageProxy    {        /// <summary>        ///        /// </summary>        private bool done;        /// <summary>        ///        /// </summary>        private Timer timer;        /// <summary>        ///        /// </summary>        public ImageProxy()        {            timer = new Timer(new TimerCallback(timerCall), this, 5000, 0);        }        /// <summary>        ///        /// </summary>        /// <param name="obj"></param>        private void timerCall(object obj)        {            done = true;            timer.Dispose();        }        /// <summary>        ///        /// </summary>        /// <returns></returns>        public Image getImage()        {            DuImager img;            if (done)                img = new FinalImage();            else                img = new QuickImage();            return img.getImage();        }    }

　　

调用试试：

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/// <summary>     /// Proxy Patterns 代理模式     ///20220918     /// geovindu,Geovin Du,涂聚文     /// </summary>     public partial class ProxyPatternsForm : Form     {           private ImageProxy imgProxy;         /// <summary>         ///         /// </summary>         private void init()         {             imgProxy = new ImageProxy();         }         /// <summary>         ///         /// </summary>         public ProxyPatternsForm()         {             InitializeComponent();             init();         }           /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void ProxyPatternsForm_Load(object sender, EventArgs e)         {           }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {             Pic.Image = imgProxy.getImage();           }     }

　　

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