C#怎么调用百度地图Web API

　　直接上代码：

  public ActionResult FindMileage()
        {
            string s;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://yingyan.baidu.com/api/v3/track/getdistance?你的ak");
            req.Method = "GET";
            WebResponse wr = req.GetResponse();
            Stream ResStream = wr.GetResponseStream();
            Encoding encoding = Encoding.GetEncoding("UTF-8");
            StreamReader streamReader = new StreamReader(ResStream, encoding);
            s=streamReader.ReadToEnd();

            JSONObject obj = new JSONObject(s);
            string dis = obj.GetString("distance");

            string test ="{"total":1,"rows":[{"VehicleID":"粤B8C97M","Mileage":“+dis+”}]}";



            return Content(test);

        }

　　这里需要说明，百度地图返回的json是这样的：

{"status":0,"message":"成功","distance":82887.01672665}

　　我需要的是带total的，所以我用了JSONObject提取了一下东东，至于这个JSONObject怎么调用的，有一个大佬封装了一个dll，直接调用就ok了。你们想用的自己去GitHub上找吧