Asp.Net中动态页面转静态页面

　　一个页面转换的类，该类通过静态函数Changfile()来实现，动态页面到静态页面的转换。 

using System;using System.IO;using System.Web;using System.Web.UI;public class HtmlProxy { public HtmlProxy() { } public static bool ChangeFile(int id) { string filename = HttpContext.Current.Server.MapPath("Post_" + id + ".html"); //尝试读取已有文件　 　 Stream st = GetFileStream(filename); //如果文件存在并且读取成功 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(); //写进文件 　 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) { //一小时后过期 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); } } }class page : Page{ //在页面文件中，ForURL.aspx的后台代码如下： 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 { } } }