asp.net request.filter override stream.read

我想改變請求內容，也就是我想把中文繁體轉換成中文簡體，它們是1：1映射。我使用下面的代碼：asp.net request.filter override stream.read

的Global.asax：

protected void Application_BeginRequest(object sender, EventArgs e) 
{ 
    Request.Filter = new RequestFilter(Request.Filter); 
}

HttpRequest.filter的用法是在這裏：msdn

RequestFilter：

public override int Read(byte[] buffer, int offset, int count) 
{ 
    // the length of buffer is 8192, will truncate my request stream 
    int len = _sink.Read(buffer, offset, count); 
    if (len == 0) 
    { 
     Array.Clear(buffer, 0, count); 
     return len; 
    } 


    System.Text.Encoding curEncoding = HttpContext.Current.Request.ContentEncoding; 
    string strBuffer = curEncoding.GetString(buffer); 

    Regex regQuery = new Regex(@"=([^&]+)", RegexOptions.Compiled); 

    strBuffer = regQuery.Replace(strBuffer, new MatchEvaluator((match) => 
    { 
     string val = HttpContext.Current.Server.UrlDecode(match.Groups[1].ToString()); 

     return "=" + HttpContext.Current.Server.UrlEncode(ChineseConverter.Convert(val, 
      ChineseConversionDirection.TraditionalToSimplified)); 
    })); 

    Array.Clear(buffer, 0, count); 
    byte[] newBuff = curEncoding.GetBytes(strBuffer); 
    newBuff.CopyTo(buffer, 0); 

    return len; 
}

我覆蓋的方法讀上流類，但第一個參數字節[]緩衝區默認長度爲8192，並將截斷我的內容。