Grasshopper.Instances.ActiveCanvas.Document fails in Rhino.Compute

Rhino Developer compute.rhino3d
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1

My C# script component works reliably but fails at the following line when the script executes on the Compute environment.

ghDoc = Grasshopper.Instances.ActiveCanvas.Document;

“Object reference not set to an instance”

I assume this is because Compute is headless.

I am trying to access the ActiveCanvas.Document to iterate all the IGH_DocumentObjects on the canvas and then to log details about things to a log file.
Is there a workaround perhaps to create the grasshopper document headlessly - similar to creating a Rhino document headlessly (RhinoDoc.CreateHeadless Method) or perhaps to access the IGH_DocumentObjects of the canvas some other way?
@AndyPayne - tagging you on the hope that you see this as you know a lot about grasshopper and compute.

2

So I’ve answered my own question using the following alternative statement that references the last document in the DocumentServer’s collection of open documents:

  //ghDoc = Grasshopper.Instances.ActiveCanvas.Document;
  int docCount = Grasshopper.Instances.DocumentServer.DocumentCount;
  ghDoc = Grasshopper.Instances.DocumentServer[docCount-1];