C# · 12月 29, 2021

c# – 如何从HttpModule中检索响应html?

这是我特意试图做的:

我已经写了一个HttpModule做一些站点的跟踪.我们网站上的一些旧的.aspx页面是硬编码的,没有真正的控件,但它们是.aspx文件,因此我们的模块在请求时仍然运行.

我的模块的处理程序附加到PostRequestHandlerExecute,所以我相信将被发送回请求者应该已经确定了.

我需要能够提取标题标签中的任何字符串.

因此,如果

<title>Chunky Bacon</title>

在最终呈现的HTML中发送到请求者.然后我想要“Chunky Bacon”.

想法?

解决方法 有趣的小挑战

以下是代码:

StreamWatcher.cs

public class StreamWatcher : Stream { private Stream _base; private MemoryStream _memoryStream = new MemoryStream(); public StreamWatcher(Stream stream) { _base = stream; } public override void Flush() { _base.Flush(); } public override int Read(byte[] buffer,int offset,int count) { return _base.Read(buffer,offset,count); } public override void Write(byte[] buffer,int count) { _memoryStream.Write(buffer,count); _base.Write(buffer,count); } public override string ToString() { return Encoding.UTF8.GetString(_memoryStream.ToArray()); } #region Rest of the overrides public override bool CanRead { get { throw new NotImplementedException(); } } public override bool CanSeek { get { throw new NotImplementedException(); } } public override bool CanWrite { get { throw new NotImplementedException(); } } public override long Seek(long offset,SeekOrigin origin) { throw new NotImplementedException(); } public override void SetLength(long value) { throw new NotImplementedException(); } public override long Length { get { throw new NotImplementedException(); } } public override long Position { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } } #endregion }

TitleModule.cs

public class TitleModule : IHttpModule{ public void Dispose() { } private static Regex regex = new Regex(@”(?<=<title>)[\w\s\r\n]*?(?=</title)”,RegexOptions.Compiled | RegexOptions.IgnoreCase); private StreamWatcher _watcher; public void Init(HttpApplication context) { context.BeginRequest += (o,e) => { _watcher = new StreamWatcher(context.Response.Filter); context.Response.Filter = _watcher; }; context.EndRequest += (o,e) => { string value = _watcher.ToString(); Trace.WriteLine(regex.Match(value).Value.Trim()); }; }}