由于一旦进行了URL重写，原先的WEBFORM中的Action会发生改变，轻易造成：请求的资源不存在问题
具体怎么样？各位DX看看就清楚了！！！
所有才有了这个ResponseFilter了，实现如下，
public class ResponseFilter:System.IO.Stream
{
public ResponseFilter(System.IO.Stream sink,string _str)
{
_sink = sink;
//
// TODO: 在此处添加构造函数逻辑
//
this.str = _str;
}
private string str = "";
private System.IO.Stream _sink;
private long _position;
private System.Text.Encoding end=System.Text.Encoding.GetEncoding("GB18030");
private System.Text.StringBuilder oOutput = new System.Text.StringBuilder();
// The following members of Stream must be overriden.
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return true; }
}
public override bool CanWrite
{
get { return true; }
}
public override long Length
{
get { return 0; }
}
public override long Position
{
get { return _position; }
set { _position = value; }
}
public override long Seek(long offset, System.IO.SeekOrigin direction)
{
return _sink.Seek(offset, direction);
}
public override void SetLength(long length)
{
_sink.SetLength(length);
}
public override void Close()
{
_sink.Close();
}
public override void Flush()
{
_sink.Flush();
}
public override int Read(byte[] buffer, int offset, int count)
{
return _sink.Read(buffer, offset, count);
}
// The Write method actually does the filtering.
public override void Write(byte[] buffer, int offset, int count)
{
string szBuffer = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);
string ap="action=\"";
int pos=-1;
if ((pos=szBuffer.IndexOf(ap) )!= -1)
{
int epos = szBuffer.IndexOf("\"", pos ap.Length 1);
if (epos != -1)
{
szBuffer= szBuffer.Remove(pos ap.Length, epos - pos - ap.Length);
}
szBuffer = szBuffer.Insert(pos ap.Length, this.str);
byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(szBuffer);
_sink.Write(data, 0, data.Length);
}
else
{
oOutput.Append(szBuffer);
}
//下面的这一段可以用来修改<Head></head>之间的内容；
//Regex oEndFile = new Regex("</head>", RegexOptions.IgnoreCase|RegexOptions.Compiled);
//if (oEndFile.IsMatch(szBuffer))
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