Asp.Net dynamic page to static page main code

1 is a page conversion class, this class through the static function Changfile() to achieve, dynamic page to static page conversion.

 
using System; 
　　using System.Data; 
　　using System.Configuration; 
　　using System.Web; 
　　using System.Web.Security; 
　　using System.Web.UI; 
　　using System.Web.UI.WebControls; 
　　using System.Web.UI.WebControls.WebParts; 
　　using System.Web.UI.HtmlControls; 
　　using System.Text; 
　　using System.IO; 
　　/**//// 
　　/// Summary description for HtmlProxy 
　　/// 
　　public class HtmlProxy 
　　...{ 
　　public HtmlProxy() 
　　...{ 
　　} 
　　public static bool ChangeFile(int id) 
　　...{ 
　　string filename = HttpContext.Current.Server.MapPath("Post_" + id + ".html"); 
　　// Try to read an existing file  　Stream st = GetFileStream(filename); 
　　// If the file exists and is read successfully  
　　if (st != null) 
　　...{ 
　　using (st) 
　　...{ 
　　StreamToStream(st, HttpContext.Current.Response.OutputStream); 
　　return true; 
　　//Response.End(); 
　　} 
　　} 
　　else 
　　...{ 
　　StringWriter sw = new StringWriter(); 
　　HttpContext.Current.Server.Execute("ForumDetail.aspx?PID=" + id, sw); 
　　string content = sw.ToString(); 
　　// Written into the file  

　try 
　　...{ 
　　using (FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Write)) 
　　...{ 
　　using (StreamWriter stw = new StreamWriter(fs, HttpContext.Current.Response.ContentEncoding)) 
　　...{ 
　　stw.Write(content); 
　　} 
　　} 
　　return true; 
　　} 
　　catch ...{ return false; } 
　　} 
　　} 
　　private static Stream GetFileStream(string filename) 
　　...{ 
　　try 
　　...{ 
　　DateTime dt = File.GetLastWriteTime(filename); 
　　TimeSpan ts = dt - DateTime.Now; 
　　if (ts.TotalHours >1) 
　　...{ 
　　//1 Expired after hours  
　　return null; 
　　} 
　　return new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); 
　　} 
　　catch ...{ return null; } 
　　} 
　　static public void StreamToStream(Stream src, Stream dst) 
　　...{ 
　　byte[] buf = new byte[4096]; 
　　while (true) 
　　...{ 
　　int c = src.Read(buf, 0, buf.Length); 
　　if (c == 0) 
　　return; 
　　dst.Write(buf, 0, c); 
　　} 
　　} 
　　} 
 In the page file, ForURL.aspx The background code is as follows:  
　　protected void Page_Load(object sender, EventArgs e) 
　　...{ 
　　try 
　　...{ 
　　int id = int.Parse(Request.QueryString["PID"]); 
　　if(HtmlProxy.ChangeFile(id)) 
　　...{ 
　　Response.Redirect("Post_" + id + ".html"); 
　　} 
　　else 
　　...{ 
　　Response.Redirect("Post.aspx?PID=" + id ); 
　　} 
　　} 
　　catch ...{ 
　　} 
　　}