用DOM实现文章采集--采集到网页源码(10)

                if (this._ProxyHost.Length > 0) 
                { 
                    request.Proxy = new WebProxy(this._ProxyHost, this._ProxyInt); 
                } 
                using (Stream requestStream = request.GetRequestStream()) 
                { 
                    requestStream.Write(bytes, 0, bytes.Length); 
                    requestStream.Close(); 
                } 
                try 
                { 
                    Encoding encoding; 
                    response = (HttpWebResponse)request.GetResponse(); 
                    responseStream = response.GetResponseStream(); 
                    if (this._HttpEncoding == null) 
                    { 
                        string str = response.CharacterSet.ToLower(); 
                        if (str.Length > 3) 
                        { 
                            if (str.Substring(0, 3) == "iso") 
                            {