FullExtent is Nothing

JeffRogholt

In the ExecuteCompleted event of a QueryTask, we add the features to a graphics layer.

The features are points.  They include geometry.

After adding/inserting the graphic into the layer, the graphicsLayer.FullExtent should have a value but is Nothing.  Prior to upgrading to the 2.3 API this was working, now it is not.  Do we need to change how we do this or is this a bug?

Here's the code from the ExecuteCompleted event:

Dim featureSet As FeatureSet = args.FeatureSet Dim graphicsLayer As GraphicsLayer = TryCast(MyMap.Layers("MyGraphicsLayer"), GraphicsLayer)  For Each feature As Graphic In featureSet.Features     graphicsLayer.Graphics.Insert(0, feature) Next  Dim env As New ESRI.ArcGIS.Client.Geometry.Envelope env.XMax = graphicsLayer.FullExtent.XMax env.XMin = graphicsLayer.FullExtent.XMin env.YMax = graphicsLayer.FullExtent.YMax env.YMin = graphicsLayer.FullExtent.YMin  MyMap.ZoomTo(env)

We get an exception on env.XMax = graphicsLayer.FullExtent.XMax because graphicsLayer.FullExtent is Nothing.

Any advice is appreciated.  Thanks.

SomeGISGuy

You could calculate the extent yourself based on the query results (sorry for the C# code - my VB is rusty :-))
Envelope env = null;
foreach(var feature in featureSet.Features)
{
    if(env == null) env = feature.Geometry.Extent;
    else env= env.Union(feature.Geometry.Extent)
}
if(env != null)
    Map.ZoomTo(env);