Revit API get bounding box around door geometry (excluding swing)

[zrodgersTSSSU]

So when i get a bounding box of a door element in dynamo it gives me a bounding box including the door swing.

EX: 

and when i get the bounding box of a door geometry it gives me the bounding box excluding the door swing
EX:

NOW USING C#!!!! so i thought the same logic would apply. I can get the bounding box of the element and it will include the door swing (which i dont want).

I just want a bounding box just around the door geometry. I have been trying to find out why i cant do this with no luck. Here is the error im getting.

here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;

namespace DynamoToRevitPlugin
{
[Transaction(TransactionMode.Manual)]
class RebarClearancesCMU : IExternalCommand
{
    public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
    {
        try
        {
            //need to select elements before

            // Get the handle of current document
            UIDocument uidoc = commandData.Application.ActiveUIDocument;
            Document doc = uidoc.Document;

            // reference the form
            RebarClearanceCMUForm form = new RebarClearanceCMUForm(uidoc);
            
            // Get the element selection of current document.
            Selection selection = uidoc.Selection;
            ICollection<ElementId> selectedIds = uidoc.Selection.GetElementIds();
            int allDoors = 0;
            int successDoors = 0;
            int allWindows = 0;
            int successWindows = 0;

            //set family to null
            Family family = null;
            //declare path to family
            String familyPath = "C:\\Users\\zrodgers\\Desktop\\Dev\\DynamoToRevitPlugin\\RebarClearanceFamily.rfa";
            //declare empty string
            string str = "";
            
            


            //gets clearance input in inches
            var clearance = (form.clearanceOffset.Value/12);

            if (0 == selectedIds.Count)
            {
                // If no elements selected.
                TaskDialog.Show("Revit", "Select one or more elements before running plugin.");
            }
            else
            {
                
                if (form.ShowDialog() == DialogResult.OK)
                {

                    
                    FilteredElementCollector collector = new FilteredElementCollector(doc).OfClass(typeof(GraphicsStyle));
                    GraphicsStyle style = collector.Cast<GraphicsStyle>().FirstOrDefault<GraphicsStyle>(gs => gs.Name.Equals("<Sketch>"));
                    ElementId categoryId = new ElementId(BuiltInCategory.OST_GenericModel);
                    using (Transaction tx = new Transaction(doc))
                    {
                        tx.Start("Place Family");

                        // load family
                        doc.LoadFamily(familyPath, out family);
                        //get family types from revit
                        FilteredElementCollector colEle = new FilteredElementCollector(doc);
                        colEle.OfClass(typeof(FamilySymbol)).OfCategory(BuiltInCategory.OST_GenericModel);

                        //grab first
                        FamilySymbol firstClearance = colEle.FirstElement() as FamilySymbol;
                        //activate family
                        if (!firstClearance.IsActive)
                        {
                            firstClearance.Activate();
                        }
                       

                        foreach (ElementId elemId in selectedIds)
                        {
                            try
                            {
                                Element elem = uidoc.Document.GetElement(elemId);
                                if ((BuiltInCategory)elem.Category.Id.IntegerValue == BuiltInCategory.OST_Doors)
                                {
                                    allDoors++;

                                    Options opts = new Options();
                                    opts.IncludeNonVisibleObjects = false;

                                    BoundingBoxXYZ bbDoor = elem.get_BoundingBox(uidoc.Document.ActiveView);
                                    LocationPoint doorCenter = elem.Location as LocationPoint;

                                    GeometryElement geoElem = elem.get_Geometry(opts);

                                    //get geometry object
                                    foreach (GeometryObject geoObj in geoElem)
                                    {
                                        GeometryInstance geoInst = geoObj as GeometryInstance;
                                        if(null !=geoInst)
                                        {
                                            GeometryElement instGeoElem = geoInst.GetInstanceGeometry();
                                            if(instGeoElem != null)
                                            {
                                                foreach (GeometryObject o in instGeoElem)
                                                {
                                                    //find solids
                                                    Solid solid = o as Solid;
                                                    BoundingBoxXYZ solidBB = solid.GetBoundingBox();

                                                    //gets center bottom of bounding box
                                                    XYZ doorMax = new XYZ(solidBB.Max.X, solidBB.Max.Y, solidBB.Min.Z);
                                                    XYZ bbDoorCenter = ((doorMax + solidBB.Min) / 2);
                                                    //sets family
                                                    doc.Create.NewFamilyInstance(bbDoorCenter, firstClearance, Autodesk.Revit.DB.Structure.StructuralType.NonStructural);
                                                    //Transform rotDoorTransform = Transform.CreateRotationAtPoint(XYZ.BasisZ, doorCenter.Rotation, bbDoorCenter);

                                                }


                                            }


                                        }

                                    }

                                }

                                else
                                {
                                    if ((BuiltInCategory)elem.Category.Id.IntegerValue == BuiltInCategory.OST_Windows)
                                    {
                                        allWindows++;
                                        BoundingBoxXYZ bbWindows = elem.get_BoundingBox(uidoc.Document.ActiveView);
                                        LocationPoint windowCenter = elem.Location as LocationPoint;
                                        doc.Create.NewFamilyInstance(windowCenter.Point, firstClearance, Autodesk.Revit.DB.Structure.StructuralType.NonStructural);

                                    }
                                }


                            }
                            catch(Exception e)
                            {
                                message = e.Message;
                            }
                        }

                        tx.Commit();
                    }
                }
            }

                    return Result.Succeeded;

[RPTHOMAS108]

Below 'solid' will be nothing if 'o' not a solid:

Solid solid = o as Solid;

Bounding box you get will be parallel to model space not the element itself i.e. a door on a diagonal wall in relation to Revit internal coordinate space will be larger than the bounding box for the same door on a wall aligned with X or Y axis.

You can perhaps use symbol geometry bounding box (.GetSymbolGeometry) and transform that to get better (tighter) result.

[zrodgersTSSSU]

So when i run it it shows solids at first. then i breaks once it hits the line elements i believe.... is there a better way to look at this? i am fairly new to C# trying to learn.  

[RPTHOMAS108 · Accepted solution]

If you are casting to Solid you can check for not null and only extract the bounding box if it isn't null i.e. 'if' statement used with inequality condition (solid != null).

You can use typeof also:

Type-testing operators and cast expression - C# reference | Microsoft Docs

Can also use ?. operators with ??.

Member access operators and expressions - C# reference | Microsoft Docs

They create lots of ways to chase the null somewhere else but you always have to deal with the null condition where it ends up eventually.