为Silverlight 提供将Json解析为Geometry的技巧

发布时间：2021-12-11 15:36:37 所属栏目：教程来源：互联网

导读：在做SOE开发的时候，我们往往返回的是一个集合对象的Json字符串，可是Silverlight中并没有为我们提供解析该字符串的方法，为此我自己写了一个，因为后台代码正在测试，所以将前端的Json格式解析为Silverlight中的Geometry对象如下，如有疑问，请跟我联系。 /

在做SOE开发的时候，我们往往返回的是一个集合对象的Json字符串，可是Silverlight中并没有为我们提供解析该字符串的方法，为此我自己写了一个，因为后台代码正在测试，所以将前端的Json格式解析为Silverlight中的Geometry对象如下，如有疑问，请跟我联系。

/// <summary>
        /// 将返回的json解析为Geometry,不考虑坐标包含M和Z，如果考虑，请改动即可。将ArcObjects的Geometry转为json的代码我正在测试。
        /// 作者：刘宇
        /// 时间2012年
        /// </summary>
        /// <param name="jsonResponse"></param>
        /// <returns></returns>

        private ESRI.ArcGIS.Client.Geometry.Geometry ParsefromJson(string jsonResponse)
        {

            JsonObject jsonObject = JsonObject.Parse(jsonResponse.ToString()) as JsonObject;
            SpatialReference pSpatial = new SpatialReference();
            ESRI.ArcGIS.Client.Geometry.Geometry pGeo = null;

            if (jsonObject.ContainsKey("geometries"))
            {


                JsonObject jsonObjectGeo = jsonObject["geometries"] as JsonObject;
                //空间参考信息
                if (jsonObjectGeo.ContainsKey("spatialReference"))
                {
                    pSpatial = this.myMap.SpatialReference;


                //JsonObject pSpatialJson =jsonObjectGeo["spatialReference"] as JsonObject;

                // 根据需要添加
                }
                //点线面对象，不考虑hasz和hasM
                if (jsonObjectGeo.ContainsKey("points"))
                {
                    JsonValue JsonPoints = jsonObjectGeo["points"];

                    if (JsonPoints is JsonArray)
                    {
                        if (JsonPoints.Count == 1)
                        {
                            MapPoint pPoint = new MapPoint();

                            //去掉中括号

                            string[] pStrPoints = JsonPoints[0].ToString().Substring(1, JsonPoints[0].ToString().Length - 2).Split(',');

                            pPoint.X = Convert.ToDouble(pStrPoints[0]);
                            pPoint.Y = Convert.ToDouble(pStrPoints[1]);

                            pGeo = pPoint;


                        }

                    }
                }
                else if (jsonObjectGeo.ContainsKey("paths"))
                {
                    JsonValue JsonPoints = jsonObjectGeo["paths"];

                    ESRI.ArcGIS.Client.Geometry.Polyline pPolyline = new ESRI.ArcGIS.Client.Geometry.Polyline();

                    ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection> pPointCollection = new ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection>();
                    // pPolyline.Paths

                    if (JsonPoints is JsonArray)
                    {
                        for (int i = 0; i < JsonPoints.Count; i++)
                        {
                            if (JsonPoints[i] is JsonArray)
                            {
                                ESRI.ArcGIS.Client.Geometry.PointCollection pPointCollections = new ESRI.ArcGIS.Client.Geometry.PointCollection();

                                JsonArray pInnerPoints = JsonPoints[i] as JsonArray;
                                for (int j = 0; j < pInnerPoints.Count; j++)
                                {
                                    string pStr = pInnerPoints[j].ToString();

                                    string[] pStrPoints = pInnerPoints[j].ToString().Substring(1, pInnerPoints[j].ToString().Length - 2).Split(',');
                                    MapPoint pPoint = new MapPoint();
                                    pPoint.X = Convert.ToDouble(pStrPoints[0]);
                                    pPoint.Y = Convert.ToDouble(pStrPoints[1]);

                                    pPointCollections.Add(pPoint);
                                }

                                pPointCollection.Add(pPointCollections);

                            }
                        }

                        pPolyline.Paths = pPointCollection;

                        pGeo = pPolyline;
                    }
                }
                else if (jsonObjectGeo.ContainsKey("rings"))
                {
                    JsonValue JsonPoints = jsonObjectGeo["rings"];

                ESRI.ArcGIS.Client.Geometry.Polygon pPolygon = new ESRI.ArcGIS.Client.Geometry.Polygon();

                ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection> pPointCollection = new ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection>();

                if (JsonPoints is JsonArray)
                {
                    for (int i = 0; i < JsonPoints.Count; i++)
                    {
                        if (JsonPoints[i] is JsonArray)
                        {
                            ESRI.ArcGIS.Client.Geometry.PointCollection pPointCollections = new ESRI.ArcGIS.Client.Geometry.PointCollection();

                            JsonArray pInnerPoints = JsonPoints[i] as JsonArray;
                            for (int j = 0; j < pInnerPoints.Count; j++)
                            {
                                string pStr = pInnerPoints[j].ToString();

                                string[] pStrPoints = pInnerPoints[j].ToString().Substring(1, pInnerPoints[j].ToString().Length - 2).Split(',');
                                MapPoint pPoint = new MapPoint();
                                pPoint.X = Convert.ToDouble(pStrPoints[0]);
                                pPoint.Y = Convert.ToDouble(pStrPoints[1]);

                                pPointCollections.Add(pPoint);
                            }

                            pPointCollection.Add(pPointCollections);

                        }
                    }

                    pPolygon.Rings= pPointCollection;

                    pGeo = pPolygon;

                }
                }
            }

          pGeo.SpatialReference = pSpatial;

            return pGeo;
        }

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