How to add a revit DB built-in-category list to a listbox on a form

Question

If I try to use addrange to add this list "builtInCats_List = new List<BuiltInCategory>();," to a list box I get the following error below.

cannot convert from 'System.Collections.Generic.List' to 'System.Windows.Forms.ListBox.ObjectCollection'

How can I populate the listbox on a form with the revit.db list of element category types?

score 1 · Answer 1 · answered May 12 '14 at 16:31

Looks like addrange needs an array to work. http://msdn.microsoft.com/en-us/library/z018s5az(v=vs.110).aspx

Do you have a collection of Elements that are of a specific builtInCategory? If so, convert your list items to an element array[] and try again. For example, if you looking to add 'Walls' to the listbox using addrange:

 Autodesk.Revit.DB.Element[] Walls = new FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Walls).ToElements().ToArray();

score 1 · Answer 2 · answered May 12 '14 at 20:50

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Try to convert your List to an Array:

yourListBox.ObjectCollection.AddRange(builtInCats_List.ToArray());

answered May 12 '14 at 20:50

lznt

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it still is an implicit conversion – Bimtopian May 14 '14 at 09:28

score 0 · Answer 3 · answered May 14 '14 at 09:46

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These lines of code populate the listbox, I found this by skimming through the building coder site. Thanx for your assistance.

lstb1.DataSource = builtInCats_List; lstb1.DisplayMember = "Name";

answered May 14 '14 at 09:46

Bimtopian

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How to add a revit DB built-in-category list to a listbox on a form

3 Answers3