Fail to get reference for grid

[Anonymous]

Hi.

I want to create dimensions between grids.

I tried two ways but it fails.

the first is

List<Curve> gridCurves = new List<Curve>();
var grids = new FilteredElementCollector(doc).OfClass(typeof(Grid)).Cast<Grid>();
foreach (var grid in grids)
{
    var curves = grid.GetCurvesInView(DatumExtentType.ViewSpecific, view); // grid.GetCurvesInView(DatumExtentType.Model, view);
    if (curves.Count() > 0)
    {
        if (curves.first().Reference != null) gridCurves.Add(curves.First());
    }
}

and the second is

var options = new Options();
options.ComputeReferences = true;
options.IncludeNonVisibleObjects = true;
options.View = view;

List<Curve> gridCurves = new List<Curve>();
var grids = new FilteredElementCollector(doc).OfClass(typeof(Grid)).Cast<Grid>();
foreach (var grid in grids)
{
    foreach (GeometryObject geoObj in grid.get_Geometry(options))
    {
        if (geoObj is Line)
        {
            var line = geoObj as Line;
            if (line.Reference != null) gridCurves.Add(line);
        }
    }
}

oh, and I tried grid.Curve.GetEndPointReference(0);

I can't get the reference for the grid.

null reference error when creating dimension.

I need your help!

thank you 🙂

[thannaingoo.api]

Hi, 

I am not sure this is what you need but you may try this.

Thanks,

Naing Oo

public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIApplication uiapp = commandData.Application;
UIDocument uidoc = uiapp.ActiveUIDocument;
Application app = uiapp.Application;
Document doc = uidoc.Document;
Selection sel = uidoc.Selection;

XYZ start = null;
XYZ end = null;

View view = doc.ActiveView;

Autodesk.Revit.DB.ViewPlan viewPlan = null;
viewPlan = doc.ActiveView as ViewPlan;

if (viewPlan == null)
{
TaskDialog.Show("Revit", "Go to Plan View!");
return Result.Cancelled;
}

FilteredElementCollector col = new FilteredElementCollector(doc, view.Id).WhereElementIsNotElementType().OfCategory(BuiltInCategory.OST_Grids);
IList<Element> elementList = col.ToElements();

foreach (Element elmt in elementList)
{
Grid grid = elmt as Grid;
IList<Curve> gridCurves = grid.GetCurvesInView(DatumExtentType.Model, view);

foreach (Curve c in gridCurves)
{
start = c.GetEndPoint(0);
end = c.GetEndPoint(1);

TaskDialog.Show("Revit", "Grid StartPoint - " + start.ToString() + "\n" + "Grid EndPoint - " + end.ToString());
}
}

return Result.Succeeded;
}

[aignatovich · Accepted solution]

Hi!

It is enough to reference entire grid for dimensioning purposes.

Just create:

var reference = new Reference(gridElem);

[Anonymous]

@thannaingoo.api

thank you for your reply!

but I was looking for a way to get grid reference.

[Anonymous]

@aignatovich

so simple!

it works.. thank you so much!!! 

[Arciviz]

Working fine for me Also