这篇文章将一步一步的说明如何从一个流中得到静态的html页并把它下载到一个文件中,当你用一个FileStream对象并把Response.Filter属性设置到这个FileStream对象时,所有的Response.Write的http输出都将写入到文件中.
1,在visual C#.net 中新建一个名为ASPNETFilter的web实用程序工程'
2,新建右键WebForm1.aspx，然后点击WebForm1.aspx的设计窗口.
3,选择"源"'
4,用下面的代码替换掉已有的代码.
WebForm1.aspx代码如下：
<%@ Page language="c#" CodeFile="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="ASPNETFilter.WebForm1" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SaveResponse</title>
</head>
<body>
<form id="SaveResponse" method="post" runat="server">
<asp:TextBox ID="TextBox1" Text="Textbox 1" Runat="server" /><br/>
<asp:ListBox ID="Listbox1" Runat="server" size="3">
<asp:ListItem Value="0">Zero</asp:ListItem>
<asp:ListItem Value="1" Selected="True">One</asp:ListItem>
<asp:ListItem Value="2">Two</asp:ListItem>
</asp:ListBox><br/>
<asp:CheckBox ID="Checkbox1" Runat="server" Checked="True" Text="Checkbox 1" />
</form>
</body>
</html>
建立ResponseFilter类:
1,添加一个名为ResponseFilter.cs的新类(实际上是一个新的.cs文件)
2,用下面的代码替换掉已有的代码.
ResponseFilter.cs的如下：
using System;
using System.IO;
namespace ASPNETFilter
{
public class ResponseFilter : Stream
{
private Stream m_sink;
private long m_position;
private FileStream fs;
public ResponseFilter(Stream sink)
{
m_sink = sink;
fs = new FileStream(@"G:/mynet/ASPNETFilter/FilterOutput/response.htm", FileMode.OpenOrCreate, FileAccess.Write);
}
// The following members of Stream must be overriden.
public override bool CanRead
{ get { return true; } }
public override bool CanSeek
{ get { return false; } }
public override bool CanWrite
{ get { return false; } }
public override long Length
{ get { return 0; } }
public override long Position
{
get { return m_position; }
set { m_position = value; }
}
public override long Seek(long offset, System.IO.SeekOrigin direction)
{
return 0;
}
public override void SetLength(long length)
{
m_sink.SetLength(length);
}
public override void Close()
{
m_sink.Close();
fs.Close();
}
public override void Flush()
{
m_sink.Flush();
}
public override int Read(byte[] buffer, int offset, int count)
{
return m_sink.Read(buffer, offset, count);
}
// Override the Write method to filter Response to a file.
public override void Write(byte[] buffer, int offset, int count)
{
//Write out the response to the browser.
m_sink.Write(buffer, 0, count);
//Write out the response to the file.
fs.Write(buffer, 0, count);
}
}
}
注意:在你运行这个程序之前:
1:建立一个文件夹G:/mynet/ASPNETFilter/FilterOutput（注：名为ASPNETFilter的web实用程序工程放在"G:/mynet/"目录下）
2.给这个文件夹赋于读与写的权力(可以设置文件夹的属性).
接着如下：
1,在解决方案面板中选择WebForm1.aspx.
2.右键单击,选择查看源码.
3.在OnInit事件中添写如何代码:
Response.Filter = new ResponseFilter(Response.Filter);
WebForm1.aspx.cs代码如下：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
namespace ASPNETFilter
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
override protected void OnInit(EventArgs e)
{
Response.Filter = new ResponseFilter(Response.Filter);
base.OnInit(e);
}
}
}
测试ResponseFilter
1.保存改变到ASPNETFilter工程.
2.选择生成菜单,选择生成解决方案.