C#读取shp文件并获取图形保存到sde要素类中（不使用ESRI的类库，纯c#实现）

说明：首先要将sde要素类发布成对应的要素服务，通过对要素服务的操作，实现数据在sde要素类中的增删

//向服务器发出请求
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
            {
                return result;
            }
            return result;
        }

#region 用c#直接读取shapfile的过程类
    class Point//点类
    {
        public double X;
        public double Y;
    }
    class Polyline//线类
    {
        public double[] Box = new double[];
        public int NumParts;
        public int NumPoints;
        public ArrayList Parts; //在部分中第一个点的索引
        public ArrayList Points; //所有部分的点
    }
    class Polygon : Polyline//面类
    { }
    #endregion 用c#直接读取shapfile的过程类

//从服务器上读取shp文件流
public Stream GetShpStream(string url)
        {
            var client = new WebClient();
            client.Encoding = Encoding.UTF8;
            Uri uri = new Uri(url);
            byte[] bytes = client.DownloadData(uri);
            Stream pstream = new MemoryStream(bytes);
            return pstream;
        }

//将读取的shp流拼成符合sde要素类的图形
public static string GetGeometryFromShp(Stream stream, string czah)
        {
            //int wkid = 2362;//西安80
            StringBuilder sb = new StringBuilder("[{");
            sb.Append(@"""attributes""" + ":{\"CZAH\":\"" + czah + "\"},");//添加属性信息
            sb.Append(@"""geometry""" + ":{");
            ArrayList polygons = new ArrayList();//面集合
            ArrayList polylines = new ArrayList();//线集合
            ArrayList points = new ArrayList();//点集合
            int ShapeType;//shp文件类型
            double xmin, ymin, xmax, ymax;
            //FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);//File.Open(filepath, FileMode.Open)
            using (BinaryReader br = new BinaryReader(stream))
            {
                br.ReadBytes();
                int FileLength = br.ReadInt32();//<0代表数据长度未知
                int FileBanben = br.ReadInt32();
                ShapeType = br.ReadInt32();
                xmin = br.ReadDouble();
                ymin = br.ReadDouble();
                xmax = br.ReadDouble();
                ymax = br.ReadDouble();
                br.ReadBytes();
                if (IsXian80(xmin, ymin, xmax, ymax))
                {
                    if (ShapeType == )
                    {
                        polygons.Clear();
                        while (br.PeekChar() != -)
                        {
                            Polygon polygon = new Polygon();
                            polygon.Parts = new ArrayList();
                            polygon.Points = new ArrayList();
                            uint RecordNum = br.ReadUInt32();
                            int DataLength = br.ReadInt32();
                            //读取第i个记录
                            int m = br.ReadInt32();
                            for (int i = ; i < ; i++)
                            {
                                polygon.Box[i] = br.ReadDouble();
                            }

                            polygon.NumParts = br.ReadInt32();
                            polygon.NumPoints = br.ReadInt32();
                            for (int j = ; j < polygon.NumParts; j++)
                            {
                                int parts = new int();
                                parts = br.ReadInt32();
                                polygon.Parts.Add(parts);
                            }
                            for (int j = ; j < polygon.NumPoints; j++)
                            {
                                Point pointtemp = new Point();
                                pointtemp.X = br.ReadDouble();
                                pointtemp.Y = br.ReadDouble();
                                polygon.Points.Add(pointtemp);
                            }
                            polygons.Add(polygon);
                        }
                        foreach (Polygon p in polygons)
                        {
                            sb.Append(@"""rings"":[");
                            for (int i = ; i < p.NumParts; i++)
                            {
                                int startpoint;
                                int endpoint;
                                if (i == p.NumParts - )
                                {
                                    startpoint = (int)p.Parts[i];
                                    endpoint = p.NumPoints;
                                }
                                else
                                {
                                    startpoint = (int)p.Parts[i];
                                    endpoint = (int)p.Parts[i + ];
                                }
                                sb.Append("[");
                                for (int k = , j = startpoint; j < endpoint; j++, k++)
                                {
                                    Point ps = (Point)p.Points[j];
                                    sb.Append("[" + ps.X + "," + ps.Y + "],");
                                }
                                sb.Remove(sb.Length - , );
                                sb.Append("],");
                            }
                            sb.Remove(sb.Length - , );
                            sb.Append("]");
                        }
                    }
                }
                else
                {
                    return "noxian";
                }
                br.Close();
                br.Dispose();
            }
            sb.Append("}");
            sb.Append("}]");
            return sb.ToString();
        }

//添加要素到sde要素类中（url为发布的要素服务地址）
public bool addFeatureToFeatureClass(string feature, string url)
        {
            bool isSuccess = false;
            url += "/addFeatures";
            string postString = "features=" + feature + "";
            postString += "&" + "f=json";
            string result = getPostData(postString, url);
            var result1 = JsonConvert.DeserializeObject<dynamic>(result);
            var presult = result1.addResults[].success as IEnumerable<dynamic>;
            string strresult = presult.ToString();
            if (string.Equals(strresult, "True"))
            {
                isSuccess = true;
            }
            return isSuccess;
        }