Revit API Tutorial: How to Select Specific Elements from Linked Files

Here is a brief explanation of how to select a specific element from a linked file, using Space as an example.
First, we need to create a custom selection filter class.

public class SelectionLinkFilter : ISelectionFilter
{
    Document linkDoc = null;

    public bool AllowElement(Element elem)
    {
        if (elem is RevitLinkInstance)
        {
            linkDoc = (elem as RevitLinkInstance).GetLinkDocument();
            return true;
        }
        return false;
    }

    public bool AllowReference(Reference reference, XYZ position)
    {
        if (linkDoc.GetElement(reference.LinkedElementId) is Space)
        {
            return true;
        }
        return false;
    }
}

Next, use this class when performing the selection:

UIDocument uiDoc = commandData.Application.ActiveUIDocument;
Reference reference = uiDoc.Selection.PickObject(ObjectType.LinkedElement, new SelectionLinkFilter());

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