Revit API Tutorial: Managing Hidden Elements in Elevation Views

Recently, I have been working on the sectional drawings for a project. Anyone who has experience with such projects knows how tedious drawing can be. Using Revit requires numerous detailed and labor-intensive steps. In this article, I want to share a small feature I developed to hide elevations within a section view.

First, gather all the elevations in the current view:

FilteredElementCollector coll = new FilteredElementCollector(doc);

coll.OfClass(typeof(Level)).OfCategory(BuiltInCategory.OST_Levels);
ICollection<ElementId> elementIds = coll.ToElementIds();

Next, remove the elevations you want to keep visible, leaving only those you wish to hide:

View view = doc.ActiveView;
LevelSelecionFilter levelSelectionFilter = new LevelSelecionFilter();
Reference refer = uidoc.Selection.PickObject(ObjectType.Element, "Select the elevations you do not want to hide!");
Level level = doc.GetElement(refer) as Level;

if (elementIds.Contains(level.Id)) {
    elementIds.Remove(level.Id);
}

Then, start a transaction to hide the selected elevations in the view:

Transaction trans = new Transaction(doc);

trans.Start("Hide Elevations");

view.HideElements(elementIds);

trans.Commit();

This outlines the basic approach for hiding elevations. For beginners, you may also need to implement the LevelSelectionFilter class used above, as shown below:

class LevelSelecionFilter : ISelectionFilter
{
    public bool AllowElement(Element elem)
    {
        if (elem is Level)
        {
            return true;
        }
        return false;
    }

    public bool AllowReference(Reference reference, XYZ position)
    {
        throw new NotImplementedException();
    }
}

That covers the method for hiding elevations in a sectional drawing. Thank you for reading!

xuebim

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