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include/ECM/open_flash_chart2/dot-net-library/written-by-xiao-yifang/OpenFlashChart/WebHandler/ofcHandler.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Web;
+using System.Web.UI;
+
+namespace OpenFlashChart.WebHandler
+{
+   public class ofcHandler: IHttpHandler
+    {
+       /// <summary>
+       /// Enables processing of HTTP Web requests by a custom HttpHandler that implements the <see cref="T:System.Web.IHttpHandler" /> interface.
+       /// </summary>
+       /// <param name="context">An <see cref="T:System.Web.HttpContext" /> object that provides references to the intrinsic server objects (for example, Request, Response, Session, and Server) used to service HTTP requests. </param>
+       public void ProcessRequest(HttpContext context)
+       {
+           using (TextWriter writer = new HtmlTextWriter(context.Response.Output))
+           {
+               string chartID = context.Request.QueryString["chartjson"];
+               if (chartID == null)
+                   return;
+               string chartjson = (string)context.Cache[chartID];
+               context.Response.Clear();
+               context.Response.CacheControl = "no-cache";
+               
+               writer.Write(chartjson);
+           }
+       }
+
+       /// <summary>
+       /// Gets a value indicating whether another request can use the <see cref="T:System.Web.IHttpHandler" /> instance.
+       /// </summary>
+       /// <returns>
+       /// true if the <see cref="T:System.Web.IHttpHandler" /> instance is reusable; otherwise, false.
+       /// </returns>
+       public bool IsReusable
+       {
+           get { return true;}
+       }
+    }
+}