asp.net2.0 URL重写以及urlMappings问题(2)

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);
}