Get grids form PickObjects Selection

[luisdavid.mena]

Hello

How can I get Grids from a List of Elements that I got with PickObjects method?

IList<Element> elemen_x = new List<Element>();
Selection sel = uidoc.Selection;
var axis_x = sel.PickObjects(ObjectType.Element).ToList();
foreach(Reference e in axis_x)
{
	var ele = doc.GetElement(e);
	elemen_x.Add(ele);
}

[RPTHOMAS108 · Accepted solution]

Cast Element to Grid

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

[Sean_Page]

If you only want grids you can use the ISeletionFilter.

https://www.revitapidocs.com/2015/8038c1e1-262e-5d25-c065-b75b9ba98603.htm

Or you can use if check to see if it's a grid:

foreach(Reference e in axis_x)
{
	If(doc.GetElement(e) is Grid grid)
        {
	    elemen_x.Add(grid);
        }
}

[luisdavid.mena]

Thanks @RPTHOMAS108  . It was indeed the casting to Grids. Also what you suggest @Sean_Page  is very usefull for me!