Filter Family Symbols which has Instance Placed in the Project Model

[Anonymous]

Hi everyone,

I am in need of creating a filter which can satisfy both of 2 conditions below:

1. Family symbols in a certain category
2. Has instance placed in the project model

For instance: I say there are 2 family symbols (Type 1 and Type 2) in a family which belongs to Structural Columns category. Among these 2 family symbols, only Type 1 has instances placed in the project model, and Type 2 has not. And now I want to create a filter in order to filter out the Type 1 only.

I came across the below link:

http://help.autodesk.com/view/RVT/2015/ENU/?guid=GUID-A2686090-69D5-48D3-8DF9-0AC4CC4067A5

and found that it is quite easy to create the filter satisfying the 1st condition as below:

ElementCategoryFilter categoryFilter = new ElementCategoryFilter(BuiltInCategory.OST_StructuralColumns);
ElementClassFilter familySymbolFilter = new ElementClassFilter(typeof(FamilySymbol));
LogicalAndFilter logicalAndFiter = new LogicalAndFilter(categoryFilter,familySymbolFilter);
FilteredElementCollector collector = new FilteredElementCollector(doc).WherePasses(logicalAndFiter); 

But now I am stuck on creating the filter to satisfy both of 2 conditions

Any advice on this issue?

[Anonymous · Accepted solution]

I would find all instances and then find the types:

Like this:

ElementCategoryFilter strCategoryFilter = new ElementCategoryFilter(BuiltInCategory.OST_StructuralColumns);
FilteredElementCollector strCollector = new FilteredElementCollector(doc);
//store instances
IList<Element> strColInstances = strCollector.WherePasses(strCategoryFilter).WhereElementIsNotElementType().ToElements();
//create list and string variable to store types in use
IList<ElementId> typesInUse = new List<ElementId>();
string types = "Type Names:" +Environment.NewLine;

foreach (Element el in strColInstances)
{
	ElementId typeId = el.GetTypeId();
	if (!typesInUse.Contains(typeId))
	{
		typesInUse.Add(typeId);
		types += doc.GetElement(typeId).Name + Environment.NewLine;
	}
}
string prompt = "Total types in use:  " + typesInUse.Count.ToString() + Environment.NewLine + types;
TaskDialog.Show("Revit", prompt);

[Anonymous]

Thanks Peterjegan

It works

You deserve the compliments