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);

}



文章来源：http://blog.csdn.net/arcgis_all/article/details/8202548