<% import namespace=System.IO %>
<script runat="server">
protected override void OnIn">

技巧实例:ASP.NET生成静态页面实现方法

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  asp.net|技巧|静态|页面

<!--Main.Aspx-->
<% page language="C#" %>
<% import namespace=System.IO %>
<script runat="server">
protected override void OnInit (EventArgs e)
{
  int id;
  try
  {
    id = int.Parse (Request.QueryString["id"]);
  }
  catch
  {
    throw (new Exception ("页面没有指定id"));
  }
  
  string filename=Server.MapPath("statichtml_"+id+".html");
  
  //尝试读取已有文件
  Stream s = GetFileStream (filename);
  if (s != null)//如果文件存在并且读取成功
  {
    using (s)
    {
      Stream2Stream (s, Response.OutputStream);
      Response.End ();
    }
  }
  
  
  //调用Main_Execute,并且获取其输出
  StringWriter sw = new StringWriter ();
  Server.Execute ("Main_Execute.aspx", sw);
  
  string content = sw.ToString ();
  
  //输出到客户端
  Response.Write(content);
  Response.Flush();
  
  //写进文件
  
  try
  {
    using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write, FileShare.Write))
    {
      using (StreamWriter streamwriter = new StreamWriter (fs, Response.ContentEncoding))
      {
        streamwriter.Write (content);
      }
    }
  }
  finally
  {
    //Response.End ();
  }
}
static public void Stream2Stream (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);
  }
}
public Stream GetFileStream(string filename)
{
  try
  {
    DateTime dt = File.GetLastWriteTime (filename);
    TimeSpan ts=dt - DateTime.Now;
    if(ts.TotalHours>1)
      return null;    //1小时后过期
    return new FileStream (filename, FileMode.Open, FileAccess.Read, FileShare.Read);
  }
  catch
  {
    return null;
  }
}
</script> 

<!--Main_Execute.aspx-->
<% page language="C#" %>
<html>
<head runat="server">
  <title>Untitled Page</title>
</head>
<body>
ID:
<%=Request.QueryString["id"]%>
</body>
</html>
  <!--Main.Aspx-->
<% page language="C#" %>
<% import namespace=System.IO %>
<script runat="server">
protected override void OnInit (EventArgs e)
{
  int id;
  try
  {
    id = int.Parse (Request.QueryString["id"]);
  }
  catch
  {
    throw (new Exception ("页面没有指定id"));
  }
  
  string filename=Server.MapPath("statichtml_"+id+".html");
  
  //尝试读取已有文件
  Stream s = GetFileStream (filename);
  if (s != null)//如果文件存在并且读取成功
  {
    using (s)
    {
      Stream2Stream (s, Response.OutputStream);
      Response.End ();
    }
  }
  
  
  //调用Main_Execute,并且获取其输出
  StringWriter sw = new StringWriter ();
  Server.Execute ("Main_Execute.aspx", sw);
  
  string content = sw.ToString ();
  
  //输出到客户端
  Response.Write(content);
  Response.Flush();
  
  //写进文件
  
  try
  {
    using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write, FileShare.Write))
    {
      using (StreamWriter streamwriter = new StreamWriter (fs, Response.ContentEncoding))
      {
        streamwriter.Write (content);
      }
    }
  }
  finally
  {
    //Response.End ();
  }
}
static public void Stream2Stream (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);
  }
}
public Stream GetFileStream(string filename)
{
  try
  {
    DateTime dt = File.GetLastWriteTime (filename);
    TimeSpan ts=dt - DateTime.Now;
    if(ts.TotalHours>1)
      return null;    //1小时后过期
    return new FileStream (filename, FileMode.Open, FileAccess.Read, FileShare.Read);
  }
  catch
  {
    return null;
  }
}
</script> 

<!--Main_Execute.aspx-->
<% page language="C#" %>
<html>
<head runat="server">
  <title>Untitled Page</title>
</head>
<body>
ID:
<%=Request.QueryString["id"]%>
</body>
</html>

  其中原理是这样的。

  Main_Execute.aspx是生成HTML的页面。

  现在用Main.aspx来对它进行缓存.

  过程如下:

  首先根据页面参数算出文件名。(这个例子只根据Request.QueryString["id"]来算)

  尝试读取缓存的文件.如果成功,那么Response.End();

  如果不成功:

  使用Server.Execute来调用Main_Execute.aspx,并且获取它的结果内容。

  得到内容后,立刻输出到客户端。

  最后把内容写进文件里,提供给下一次做为缓存度取。

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