FamilyInstanceFilter Class

A filter used to find elements that are family instances of the given family symbol.

Inheritance Hierarchy

System.Object
  Autodesk.Revit.DB.ElementFilter
    Autodesk.Revit.DB.ElementSlowFilter
      Autodesk.Revit.DB.FamilyInstanceFilter

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)

Syntax

C#

public class FamilyInstanceFilter : ElementSlowFilter

The FamilyInstanceFilter type exposes the following members.

Constructors

	Name	Description
	FamilyInstanceFilter	Constructs a new instance of a filter to match family instances of the given family symbol.

Properties

	Name	Description
	FamilySymbolId	The family symbol id.
	Inverted	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. (Inherited from ElementFilter)
	IsValidObject	Specifies whether the .NET object represents a valid Revit entity. (Inherited from ElementFilter)

Methods

	Name	Description
	Dispose	(Inherited from ElementFilter)
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object)
	GetHashCode	Serves as the default hash function. (Inherited from Object)
	GetType	Gets the Type of the current instance. (Inherited from Object)
	PassesFilter(Element)	Applies the filter to a given element. (Inherited from ElementFilter)
	PassesFilter(Document, ElementId)	Applies the filter to a given element. (Inherited from ElementFilter)
	ToString	Returns a string that represents the current object. (Inherited from Object)

Remarks

This filter is a slow filter, but it uses a quick filter to eliminate non-candidate elements before the elements are obtained and expanded. Therefore this filter does not have to be paired with another quick filter to minimize the number of Elements that are expanded.

Example

C#

// Creates a FamilyInstance filter for elements that are family instances of the given family symbol in the document

// Find all family symbols whose name is "W10X49"
FilteredElementCollector collector = new FilteredElementCollector(document);
collector = collector.OfClass(typeof(FamilySymbol));

// Get Element Id for family symbol which will be used to find family instances
var query = from element in collector where element.Name == "W10X49" select element;
List<Element> famSyms = query.ToList<Element>();
ElementId symbolId = famSyms[0].Id;

// Create a FamilyInstance filter with the FamilySymbol Id
FamilyInstanceFilter filter = new FamilyInstanceFilter(document, symbolId);

// Apply the filter to the elements in the active document
collector = new FilteredElementCollector(document);
ICollection<Element> familyInstances = collector.WherePasses(filter).ToElements();

VB

' Creates a FamilyInstance filter for elements that are family instances of the given family symbol in the document

' Find all family symbols whose name is "W10X49"
Dim collector As New FilteredElementCollector(document)
collector = collector.OfClass(GetType(FamilySymbol))

' Get Element Id for family symbol which will be used to find family instances
Dim query As System.Collections.Generic.IEnumerable(Of Autodesk.Revit.DB.Element)
query = From element In collector _
 Where element.Name = "Level 1" _
 Select element

Dim famSyms As List(Of Element) = query.ToList()
Dim symbolId As ElementId = famSyms(0).Id

' Create a FamilyInstance filter with the FamilySymbol Id
Dim filter As New FamilyInstanceFilter(document, symbolId)

' Apply the filter to the elements in the active document
collector = New FilteredElementCollector(document)
Dim familyInstances As ICollection(Of Element) = collector.WherePasses(filter).ToElements()