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

 1   public List<string> getGeometry(string CZAH, string url)
 2         {
 3             url += "/query";//query url

 4             string postString = "where=CZAH=‘" + CZAH + "‘";//where
 5             //postString += "text=04CH88131210000004";
 6             postString += "&" + "returnGeometry=true";//returnGeometry
 7             postString += "&" + "f=json";//json
 8             string result = getPostData(postString, url);
 9             List<string> list = new List<string>();
10             var result1 = JsonConvert.DeserializeObject<dynamic>(result);//添加Newtonsoft.Json类库并引用;
11             var list1 = result1.features as IEnumerable<dynamic>;
12             dynamic[] jsonfea = list1.ToArray();
13             for (int i = 0; i < jsonfea.Length; i++)
14             {
15                 list.Add(jsonfea[i].geometry.ToString());
16             }
17             return list;
18         }
19 
20         /// <summary>
21         /// 获取post后的返回值
22         /// </summary>
23         /// <param name="postString">POST String</param>
24         /// <param name="url">Post URL</param>
25         /// <returns></returns>
26         public string getPostData(string postString, string url)
27         {
28             string result = "";
29             try
30             {
31                 byte[] postData = Encoding.UTF8.GetBytes(postString);
32                 WebClient webClient = new WebClient();
33                 string method = "POST";
34                 //POST Header
35                 webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
36                 //webClient.Headers.Add("Cache-Control", "no-cache");
37                 //同步提交请求，并返回数据
38                 byte[] responseData = webClient.UploadData(url, method, postData);//得到返回字符流  
39                 result = Encoding.UTF8.GetString(responseData);//解码
40             }
41             catch (Exception)
42             {
43                 throw;
44             }
45             return result;
46         }