public static string GetBaiDuExtKey_post(string key)
        {
            string strURL = String.Format("http://suggestion.baidu.com/su?wd={0}&sugmode=3&json=1", key);
            //json参数
            string jsonParam = Newtonsoft.Json.JsonConvert.SerializeObject(new
            {

            });
            var request = (HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "POST";
            request.ContentType = "application/json;charset=UTF-8";
            byte[] byteData = Encoding.UTF8.GetBytes(jsonParam);
            int length = byteData.Length;
            request.ContentLength = length;
            Stream writer = request.GetRequestStream();
            writer.Write(byteData, 0, length);
            writer.Close();
            var response = (HttpWebResponse)request.GetResponse();
            //var responseString = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")).ReadToEnd();

            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string result = reader.ReadToEnd();

            //StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            MessageBox.Show(result);
            return result.ToString();
        }

这段代码运行结果如上图，是乱码是怎么回事？post请求也试了也不行
public KeyWordModel GetBaiDuExtKey(string key)
        {
            string strURL = String.Format("http://suggestion.baidu.com/su?wd={0}&sugmode=3&json=1", key);
            System.Net.HttpWebRequest request;
            // 创建一个HTTP请求
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            //request.Method="get";
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader myreader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = myreader.ReadToEnd();
            myreader.Close();
            MessageBox.Show(responseText);
            return null;
        }