解决繁体页面的乱码问题

HttpWebRequest 默认请求URL，返回的文本是乱码！需要设置请求参数：
            httpWebRequest.ContentType = contentType;
            httpWebRequest.Referer = url;
            httpWebRequest.Accept = accept;
            httpWebRequest.UserAgent = userAgent;
            httpWebRequest.Method = "GET";
For Example:

http://tw.search.yahoo.com/search?p=NBA&fr=yfp&ei=utf-8&v=0

关键是要配置请求参数！

以下是代码：

        private string contentType = "application/x-www-form-urlencoded";
        private string accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-silverlight-2-b1, */*";
        private string userAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";
        private Encoding encoding = Encoding.GetEncoding("iso-8859-1");

        public string GetHtml(string url)
        {
            HttpWebRequest httpWebRequest;

            httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
            httpWebRequest.ContentType = contentType;
            httpWebRequest.Referer = url;
            httpWebRequest.Accept = accept;
            httpWebRequest.UserAgent = userAgent;
            httpWebRequest.Method = "GET";

            HttpWebResponse httpWebResponse;
            httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            Stream responseStream = httpWebResponse.GetResponseStream();
            StreamReader streamReader = new StreamReader(new DeflateStream(responseStream, CompressionMode.Decompress),encoding);
            StreamReader streamReader = new StreamReader(responseStream);
            string html = streamReader.ReadToEnd();
             
            streamReader.Close();
            responseStream.Close();

            return html;
        }

以下是调用代码：

string rtnHtml = GetHtml("http://tw.search.yahoo.com/search?p=NBA&fr=yfp&ei=utf-8&v=0");