Feature转化为Json对象

下面是将Feature对象的Geometry对象和属性分别转换为两个Json文本，代码很简单：

 /// <summary>
        /// 提取feature的geometry，并将其转换为json对象
        /// </summary>
        /// <param name="pFeature">要素对象</param>
        /// <returns></returns>
        private string feature2JsonGeometry(ESRI.ArcGIS.Geodatabase.IFeature pFeature)
        {
            ESRI.ArcGIS.Geometry.IGeometry pGeo = pFeature.Shape;
            int wkid = pGeo.SpatialReference.FactoryCode;
            ESRI.ArcGIS.Geometry.IPoint pPoint = null;
            ESRI.ArcGIS.Geometry.IPointCollection pPoints = null;
            double x, y;
            StringBuilder sb = new StringBuilder("{");

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

                #endregion

                #region Polygon2Json
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:
                    pPoints = pGeo as ESRI.ArcGIS.Geometry.IPointCollection;
                    sb.Append(@"""rings"":[[");
                    for (int i = 0; i < pPoints.PointCount; i++)
                    {
                        pPoint = pPoints.get_Point(i);
                        pPoint.QueryCoords(out x, out y);
                        sb.Append("[" + x + "," + y + "],");
                    }
                    sb.Remove(sb.Length - 1, 1);
                    sb.Append("]]" + @",""spatialReference"":" + @"{""wkid"":" + wkid + "}");
                   
                    break;
                #endregion
            }
            sb.Append("}");

            return sb.ToString();
 
        }
        /// <summary>
        /// 创建feature要素非空间属性的json对象
        /// </summary>
        /// <param name="pFeature">要素对象</param>
        /// <returns></returns>
        private string feature2JsonGeoAttribute(ESRI.ArcGIS.Geodatabase.IFeature pFeature)
        {
            StringBuilder sb = new StringBuilder("{");
            for (int i = 0; i < pFeature.Fields.FieldCount; i++)
            {
                if (pFeature.Fields.get_Field(i).Name.ToLower() != "shape")
                {
                    string name = pFeature.Fields.get_Field(i).Name;
                    sb.Append(@",""" + name + @""":");
                    if (pFeature.get_Value(i).ToString() == "")
                        sb.Append(@"""""");
                    else
                        sb.Append(@"""" + pFeature.get_Value(i) + @"""");
                }
            }
            sb.Remove(1, 1);
            sb.Append("}");

            return sb.ToString();

        }