ElementLevelFilter

Description:
A filter used to match elements by their associated level.

Remarks:
This filter is a slow filter. Slow filters require that the Element be obtained and expanded in memory first. Thus it is preferable to couple this filter with at least one ElementQuickFilter, which should minimize the number of Elements that are expanded.

Inheritance Hierarchy:
System.Object
  Autodesk.Revit.DB.ElementFilter
    Autodesk.Revit.DB.ElementSlowFilter
      Autodesk.Revit.DB.ElementLevelFilter

public class ElementLevelFilter : ElementSlowFilter

Public Class ElementLevelFilter _
	Inherits ElementSlowFilter

public ref class ElementLevelFilter : public ElementSlowFilter

// Use ElementLevel filter to find elements by their associated level in the document

// Find the level whose Name is "Level 1"
FilteredElementCollector collector = new FilteredElementCollector(document);
ICollection<Element> levels = collector.OfClass(typeof(Level)).ToElements();
var query = from element in collector where element.Name == "Level 1" select element;// Linq query

// Get the level id which will be used to match elements
List<Element> level1 = query.ToList<Element>();
ElementId levelId = level1[0].Id;

// Find all walls on level one
ElementLevelFilter level1Filter = new ElementLevelFilter(levelId);
collector = new FilteredElementCollector(document);
ICollection<Element> allWallsOnLevel1 = collector.OfClass(typeof(Wall)).WherePasses(level1Filter).ToElements();


// Find all rooms not on level one: use an inverted ElementLevelFilter to match all elements not on the target level
ElementLevelFilter notOnLevel1Filter = new ElementLevelFilter(levelId, true); // Inverted filter
collector = new FilteredElementCollector(document);
IList<Element> allRoomsNotOnLevel1 = collector.WherePasses(new RoomFilter()).WherePasses(notOnLevel1Filter).ToElements();

' Use ElementLevel filter to find elements by their associated level in the document


' Find the level whose Name is "Level 1"
Dim collector As New FilteredElementCollector(document)
Dim levels As ICollection(Of Element) = collector.OfClass(GetType(Level)).ToElements()
Dim query As System.Collections.Generic.IEnumerable(Of Autodesk.Revit.DB.Element)
query = From element In collector _
 Where element.Name = "Level 1" _
 Select element

' Linq query
' Get the level id which will be used to match elements
Dim level1 As List(Of Element) = query.ToList()
Dim levelId As ElementId = level1(0).Id

' Find all walls on level one
Dim level1Filter As New ElementLevelFilter(levelId)
collector = New FilteredElementCollector(document)
Dim allWallsOnLevel1 As ICollection(Of Element) = collector.OfClass(GetType(Wall)).WherePasses(level1Filter).ToElements()


' Find all rooms not on level one: use an inverted ElementLevelFilter to match all elements not on the target level
Dim notOnLevel1Filter As New ElementLevelFilter(levelId, True)
' Inverted filter
collector = New FilteredElementCollector(document)
Dim allRoomsNotOnLevel1 As IList(Of Element) = collector.WherePasses(New RoomFilter()).WherePasses(notOnLevel1Filter).ToElements()

Name	Return Type	Description	Inherited From
C ElementLevelFilter(ElementId)	None	Constructs a new instance of an ElementLevelFilter.
C ElementLevelFilter(ElementId, Boolean)	None	Constructs a new instance of an ElementLevelFilter, with the option to match all elements not associated to the given level id.

Name	Return Type	Description	Inherited From
M Dispose()	None	Releases all resources used by the	ElementFilter
M PassesFilter(Document, ElementId)	bool	Applies the filter to a given element.	ElementFilter
M PassesFilter(Element)	bool	Applies the filter to a given element.	ElementFilter

Name	Return Type	Description	Inherited From
P LevelId	ElementId	The id of the level that will be matched to elements' associated level.
P Inverted	bool	True if the results of the filter are inverted; elements that would normally be accepted by this filter will be rejected, and elements that would normally be rejected will be accepted.	ElementFilter
P IsValidObject	bool	Specifies whether the .NET object represents a valid Revit entity.	ElementFilter