跟据URL来实现WebService

 [WebMethod]
        public string GetResults(string word)
        {
            string resultHtml = string.Empty;

            //将输入的字符串转成URL编码
            string myWord = HttpUtility.UrlEncode(word, UnicodeEncoding.GetEncoding("GB2312"));

            //引用System.Net空间，创建一个新的请求;
            HttpWebRequest webrt = WebRequest.Create("http://www.baidu.com/s?wd=" + myWord) as HttpWebRequest;
            //获取响应;
            HttpWebResponse webrs = webrt.GetResponse() as HttpWebResponse;

            //读取响应内容;
            Stream stream = webrs.GetResponseStream();
            StreamReader reader = new StreamReader(stream, Encoding.Default);
            //结束读取;
            resultHtml = reader.ReadToEnd();

            reader.Close();
            stream.Close();
            webrs.Close();

            //返回结果
            return resultHtml;
        }