Asp.Net中动态页面转静态页面

关于在Asp.Net中动态页面转静态页面的方法网上比较多。结合实际的需求，我在网上找了一些源代码，并作修改。现在把修改后的代码以及说明写一下。

一个是一个页面转换的类，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.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＞
/// Summary description for HtmlProxy
/// ＜/summary＞
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); 
　}
　}
}
　　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 ...{ 
}
}