Revit API
11 articles
Revit API — Transaction Handler Pool
A pool of generic ExternalEvent workers that accept Action<Document> — eliminating one IExternalEventHandler per operation using a concurrent queue, worker pool, and callback chain.
RevitAPI — Parameter by BuiltInParameter
Replacing the obsolete get_Parameter overload with an enumerator-based lookup that checks InternalDefinition.BuiltInParameter for typed enum-based parameter retrieval in Revit 2015+.
RevitAPI — Oh The Parameters
Three methods for retrieving the complete parameter set of a Revit family element — instance+symbol+family union, family document FamilyManager, and ParametersMap vs ParametersSet.
Families, Symbols, Instances & System Families
The Revit API hierarchy of Family, FamilySymbol, and FamilyInstance — with FilteredElementCollector queries for instances, families, system types, and navigating between them.
Parameters in Revit API
Retrieving Revit parameters by BuiltInParameter, name, and ordered list — reading and setting values by StorageType, and converting between internal and display units with UnitUtils and LabelUtils.
Revit API — Custom Selection Filter
Implementing ISelectionFilter to restrict user selection in a Revit add-in — using BuiltInCategory to allow only door elements through PickElementsByRectangle.
RevitAPI — Getting Parameters
Retrieving room, door, and window parameter values via get_Parameter(BuiltInParameter) — reading doubles, strings, and ElementIds with HasValue guards for safe access.
Family Instance Location
Getting a Revit family instance's XYZ position — using LocationPoint for free-standing elements and HostParameter + Curve.Evaluate for wall-hosted elements like doors and windows.
Get Revit Elements with a Certain Level
Using FilteredElementCollector with OfCategory and ElementLevelFilter to retrieve all doors on a specific level — combining fast and slow filters for efficient querying.