用post请求方式实现对地图服务的基本操作

ArcGIS Server REST API 中的很多操作都可以用以下方式实现，具体参数的设置请查看其中的详细说明

   public List<string> getGeometry(string CZAH, string url)

         {

             url += "/query";//query url

             string postString = "where=CZAH='" + CZAH + "'";//where

             //postString += "text=04CH88131210000004";

             postString += "&" + "returnGeometry=true";//returnGeometry

             postString += "&" + "f=json";//json

             string result = getPostData(postString, url);

             List<string> list = new List<string>();

             var result1 = JsonConvert.DeserializeObject<dynamic>(result);//添加Newtonsoft.Json类库并引用;

             var list1 = result1.features as IEnumerable<dynamic>;

             dynamic[] jsonfea = list1.ToArray();

             for (int i = ; i < jsonfea.Length; i++)

             {

                 list.Add(jsonfea[i].geometry.ToString());

             }

             return list;

         }

         /// <summary>

         /// 获取post后的返回值

         /// </summary>

         /// <param name="postString">POST String</param>

         /// <param name="url">Post URL</param>

         /// <returns></returns>

         public string getPostData(string postString, string url)

         {

             string result = "";

             try

             {

                 byte[] postData = Encoding.UTF8.GetBytes(postString);

                 WebClient webClient = new WebClient();

                 string method = "POST";

                 //POST Header

                 webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

                 //webClient.Headers.Add("Cache-Control", "no-cache");

                 //同步提交请求，并返回数据

                 byte[] responseData = webClient.UploadData(url, method, postData);//得到返回字符流

                 result = Encoding.UTF8.GetString(responseData);//解码

             }

             catch (Exception)

             {

                 throw;

             }

             return result;

         }