filter for group elements matching groupname

[CADdaddy.com]

I want to filter for element IDs of groups matching groupname.  Can anybody help me with this?

James LeVieux

[RPTHOMAS108 · Accepted solution]

VB

 Public Function Execute_GroupNameFilter(ByVal commandData As Autodesk.Revit.UI.ExternalCommandData, _
                          ByRef message As String, ByVal elements As Autodesk.Revit.DB.ElementSet) _
                          As Autodesk.Revit.UI.Result

        Dim UIDoc As Autodesk.Revit.UI.UIDocument = commandData.Application.ActiveUIDocument
        If UIDoc Is Nothing Then Return Result.Cancelled Else 
        Dim Doc As Document = UIDoc.Document
        Dim FEC As New FilteredElementCollector(Doc)

        Dim ECF1 As New ElementCategoryFilter(BuiltInCategory.OST_IOSDetailGroups)
        Dim ECF2 As New ElementCategoryFilter(BuiltInCategory.OST_IOSModelGroups)
        Dim LorF As New LogicalOrFilter(ECF1, ECF2)

        Dim Els As List(Of ElementId) = FEC.WherePasses(LorF).WhereElementIsNotElementType.ToList. _
            FindAll(Function(X) X.Name = "TheGroupIWant").Select(Function(v) v.Id).ToList

    
	UIDoc.Selection.SetElementIds(Els)


        Return Result.Succeeded
    End Function

C#

public Autodesk.Revit.UI.Result Execute_GroupNameFilter(Autodesk.Revit.UI.ExternalCommandData commandData, ref string message, Autodesk.Revit.DB.ElementSet elements)
	{

		Autodesk.Revit.UI.UIDocument UIDoc = commandData.Application.ActiveUIDocument;
		if (UIDoc == null)
			return Result.Cancelled;
		Document Doc = UIDoc.Document;
		FilteredElementCollector FEC = new FilteredElementCollector(Doc);

		ElementCategoryFilter ECF1 = new ElementCategoryFilter(BuiltInCategory.OST_IOSDetailGroups);
		ElementCategoryFilter ECF2 = new ElementCategoryFilter(BuiltInCategory.OST_IOSModelGroups);
		LogicalOrFilter LorF = new LogicalOrFilter(ECF1, ECF2);

		List<ElementId> Els = FEC.WherePasses(LorF).WhereElementIsNotElementType().ToList().FindAll(X => X.Name == "TheGroupIWant").Select(v => v.Id).ToList();

		UIDoc.Selection.SetElementIds(Els);
		
		return Result.Succeeded;
	}

[JimJia]

Thanks for RPTHOMAS108‘s replay, this should works!

Yet another approach is to use shortcut OfClass API of FilteredElementCollector:

			FilteredElementCollector coll = new FilteredElementCollector(this.Document);
			List<ElementId> groupIds = coll.OfClass(typeof(Group))
				.ToList().FindAll(X => X.Name == "<Your group name>").Select(v => v.Id).ToList();

[abudayev]

Hi, I'm trying to do something similar, but I want to create groups of filtered structural connections, however I don't know apriori how many groups will be and their names. any suggestions? 

here i collected all structural connections in the view:

connections_in_view = [x for x in DB.FilteredElementCollector(doc, view.Id) if x.Category != None if x.Category.Name == 'Structural Connections']

but what are the further steps? I am stuck. 

thanks.