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