ITopologicalOperator.Intersect, how does this work?

I'm trying to intersect all features of a layer with another's but I'm getting the web ADF application stuck while executing the "ConstructUnion" function

Here's the code I've written so far

// create a geometrybag for layer1 ESRI.ArcGIS.Geometry.IGeometry geometryBag = new ESRI.ArcGIS.Geometry.GeometryBagClass(); geometryBag.SpatialReference = m_firstLayerFirstfeatureIGeometry.SpatialReference; ESRI.ArcGIS.Geometry.IGeometryCollection geometryCollection = (ESRI.ArcGIS.Geometry.IGeometryCollection)geometryBag; // Cycle all features of first layer and add them to the collection foreach (DataRow m_dr in m_firstLayerfeatureGraphics.Rows) { // Takes this feature's geometry ESRI.ArcGIS.ADF.Web.Geometry.Geometry adfFeature = m_firstLayerfeatureGraphics.GeometryFromRow(m_dr) as ESRI.ArcGIS.ADF.Web.Geometry.Geometry; // convert to a igeometry object ESRI.ArcGIS.Geometry.IGeometry m_tempfeatureIGeometry = ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.Local.Converter.ToIGeometry(adfFeature, ctx); System.Diagnostics.Debug.WriteLine("m_firstLayerfeatureGraphics +1 "); object missing = Type.Missing; geometryCollection.AddGeometry(m_tempfeatureIGeometry, ref missing, ref missing); } ESRI.ArcGIS.Geometry.ITopologicalOperator mtopo1 = new ESRI.ArcGIS.Geometry.PolygonClass(); // FOLLOWING LINE BLOCKS APPLICATION mtopo1.ConstructUnion((ESRI.ArcGIS.Geometry.IEnumGeometry)geometryBag);

Any idea why?

-------------Problems Reply------------

As stated in GIS version of this website, this is the solution

You need to create the ArcObject instances (GeometryBagClass at the beginning and PolygonClass near the end of your code snippet) on the ArcGIS Server SOC by using IServerContext.CreateObject. Your current code creates these objects on the web server (or wherever your ADF app is running), which requires a lot of marshalling which in many cases seems to never finish.

You already have the reference to the server context in the ctx variable, so you are basically all set. Once all the ArcObjects are created on the ArcGIS Server, your problem is likely to be solved.

Category:c# Views:10 Time:2011-08-06

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