Asp.Net中动态页面转静态页面 1

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。

一下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; }
    }

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 ...{
         }
    }