C#调用ArcGIS REST服务

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Tasks;
using System.Net;
using System.IO;

namespace ArcGISDemo
{
    //自定义的Feature
    class FeatureItem
    {
        public Geometry Geometry { set; get; }
        public IDictionary<string, object> Attributes { set; get; }
    };

    class Program
    {
        static bool AddFeature(string layerUrl, FeatureItem featureItem)
        {
            string url = layerUrl+"/addFeatures";
            string data = "f=json"; //以json格式返回结果

            ESRI.ArcGIS.Client.Graphic g = new ESRI.ArcGIS.Client.Graphic()
            {
                //Graphic的Attributes在ArcGIS API for WPF 中是只读的
                //如果是可写的，就可以直接使用Graphic的Attributes，而不需要拼接json
                //Attributes = featureItem.Attributes, 
                Geometry = featureItem.Geometry
            };
            FeatureSet fs = new FeatureSet();
            fs.Features.Add(g);
            //使用FeatureSet自带的ToJson函数转换，可以帮助转换Feature的Geometry对象
            //ArcGIS的Geometry对象序列化为json字符串时和标准的json不太一样
            string json = fs.ToJson();
            int begin = json.IndexOf("[");
            int end = json.IndexOf("]", begin);
            string featuresJson = json.Substring(begin, end - begin + 1);
            string features = string.Format("&features={0}", featuresJson);
            data += features;

            //使用fastJson转换Attributes
            //fastJSON.JSON.Instance.Parameters.UseEscapedUnicode = false;
            //string attr = fastJSON.JSON.Instance.ToJSON(featureItem.Attributes);
            string attr = Newtonsoft.Json.JsonConvert.SerializeObject(featureItem.Attributes);
            //int attrPos = data.IndexOf("attributes");
            //将原来空的Attributes替换掉，以自己转换的json字符串实际情况为准
            string para = data.Replace("\"attributes\":{}","\"attributes\":"+attr);
            
            string res = PostData(url, para);

            //处理返回的结果
            if (res.Contains("error"))
                return false;
            Dictionary<string, List<Dictionary<string, object>>> resDic 
                = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, List<Dictionary<string, object>>>>(res);
            if (resDic.ContainsKey("addResults"))
            {
                List<Dictionary<string, object>> addRes = resDic["addResults"];
                foreach (Dictionary<string, object> dic in addRes)
                {
                    if (dic.ContainsKey("success"))
                    {
                        if (dic["success"].ToString().ToLower() == "true")
                            return true;
                        else return false;
                    }
                }
            }
            return false;
        }

        static string PostData(string url, string data)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            byte[] bs = Encoding.UTF8.GetBytes(data);
            Stream reqStream = request.GetRequestStream();
            reqStream.Write(bs, 0, bs.Length);
            reqStream.Close();

            string responseString = null;
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                responseString = reader.ReadToEnd();
                reader.Close();
            }
            return responseString;
        }

        static void Main(string[] args)
        {
            string url = "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Fire/Sheep/FeatureServer/0";
            MapPoint point = new MapPoint(105, 30);

            FeatureItem fi = new FeatureItem();
            fi.Geometry = point;
            fi.Attributes = new Dictionary<string, object>();
            fi.Attributes.Add("description", "测试点");
            bool res = AddFeature(url, fi);
            if (res)
            {
                Console.WriteLine("添加要素成功！");
            }
            else
            {
                Console.WriteLine("添加要素失败！");
            }
            Console.ReadKey();
        }
    }
}