ArcObjects中的IGeometry转成Json

昨天发了将Json格式的描述转换为Web API中的Geometry，今天发一个将ArcObjects中的IGeometry转成Json。

 private string Geometry2Json(IGeometry pGeo)
        {

            int wkid = pGeo.SpatialReference.FactoryCode;
            ESRI.ArcGIS.Geometry.IPoint pPoint = null;
            ESRI.ArcGIS.Geometry.IPointCollection pPoints = null;
            double x, y;
            StringBuilder sb = new StringBuilder("{");
            sb.Append(@"""geometries""" + ":{");

            switch (pGeo.GeometryType)
            {
                #region Point2Json
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:
                    pPoint = pGeo as ESRI.ArcGIS.Geometry.IPoint;
                    pPoint.QueryCoords(out x, out y);
                    string json = @"{""x"":" + x + @",""y"":" + y + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}";
                    sb.Append(@"""point"":" + json);
  
                    break;
                #endregion

                #region Polyline2Json
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:
                    pPoints = pGeo as ESRI.ArcGIS.Geometry.IPointCollection;

                    IPolyline pPolyline = pGeo as IPolyline;

                    IGeometryCollection pGeoetryCollection = pPolyline as IGeometryCollection;

                    if (pGeoetryCollection.GeometryCount >= 1)
                    {
                        sb.Append(@"""paths"":[");
                        for (int i = 0; i < pGeoetryCollection.GeometryCount; i++)
                        {
                            //paths可能有多个path，而每一个path是多个点，用两个for循环
                            if (pGeoetryCollection.get_Geometry(i) is IPath)
                            {
                                sb.Append("[");
                                pPoints = pGeoetryCollection.get_Geometry(i) as IPointCollection;

                                for (int j = 0; j < pPoints.PointCount;j++ )
                                {
                                    pPoint = pPoints.get_Point(j);
                                    pPoint.QueryCoords(out x, out y);
                                    sb.Append("[" + x + "," + y + "],");
                                }
                                sb.Remove(sb.Length - 1, 1);
                                sb.Append("]");
                            }
                        }
                        sb.Append("]" + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}");
                      
                    }
                    
                    break;

                #endregion

                #region Polygon2Json
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:
                    pPoints = pGeo as ESRI.ArcGIS.Geometry.IPointCollection;



                    IPolygon pPolygon = pGeo as IPolygon;

                    //外环和内环？面的构造比较复杂，在AO中我们可以获取内环和外环，如果注意过在客户端API中的Rings数组，似乎看不出，所以这里我没采用外环和内环的构造方式，但是代码在后面附上。                  

                    IGeometryCollection pGeoetryCollection1 = pPolygon as IGeometryCollection;

                    if (pGeoetryCollection1.GeometryCount >=1)
                    {
                        sb.Append(@"""rings"":[");
                        for (int i = 0; i < pGeoetryCollection1.GeometryCount; i++)
                        {

                            if (pGeoetryCollection1.get_Geometry(i) is IRing)
                            {
                                sb.Append("[");
                                pPoints = pGeoetryCollection1.get_Geometry(i) as IPointCollection;
                                for (int j = 0; j < pPoints.PointCount;j++ )
                                {
                               
                                    pPoint = pPoints.get_Point(j);
                                    pPoint.QueryCoords(out x, out y);
                                    sb.Append("[" + x + "," + y + "],");
                                }

                                sb.Remove(sb.Length - 1, 1);
                                sb.Append("]");
                            }
                        }
                        sb.Append("]" + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}");
                   
                    }
                                       break;
                #endregion
            }

            sb.Append("}");

            //添加Geometry

            sb.Append("}");

            return sb.ToString();

        }

 

 

 

 下面是获取面的内环和外环的坐标

      public  void PolygonToString(IPolygon4 polygon)

        {

               IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;

 

               IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;

 

               Trace.WriteLine("polygon.ExteriorRingCount = "+ exteriorRingGeometryCollection.GeometryCount);

 

               for(int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)

               {

                     Trace.WriteLine("polygon.ExteriorRing["+ i +"]");

 

                     IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);

 

                     IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;

 

                     for(int j = 0; j < exteriorRingPointCollection.PointCount; j++)

                      {

                            Trace.WriteLine("Point["+ j +"] = "+ PointToString(exteriorRingPointCollection.get_Point(j)));

                      }

 

                     IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);

 

                     IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;

 

                     Trace.WriteLine("polygon.InteriorRingCount[exteriorRing"+ i +"] = "+ interiorRingGeometryCollection.GeometryCount);

 

                     for(int k = 0; k < interiorRingGeometryCollection.GeometryCount; k++)

                      {

                            Trace.WriteLine("polygon.InteriorRing["+ k +"]");

 

                            IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);

 

                            IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;

 

                            for(int m = 0; m < interiorRingPointCollection.PointCount; m++)

                             {

                                   Trace.WriteLine("Point["+ m +"] = "+ PointToString(interiorRingPointCollection.get_Point(m)));

                             }

                      }

               }

        }

 

       private   string PointToString(IPoint point)

        {

           return(point.X +", "+ point.Y +", "+ point.Z);

        }