Learn to program the Revit API by Boost Your BIM

"Revit API Basics
Introduction: A Simple Macro
Prompt user to select an element & get element info
Prompt user to select edge or face & get edge/face info
Selection - getting and setting selected elements
Find Elements - FilteredElementCollector #1
Find Elements - FilteredElementCollector #2
Find Elements - LINQ queries
Find Drafting Views that contain a CAD Link
Create an External Command
Family Types and Parameters
Get Line Length and Convert Units
.NET, C# and general programming basics
Read and Write Text Files
Directory and Path operations
Read from Excel into a Revit API external command
Write Revit data to Excel
Exception Handling
Code Reuse and Helper Functions
Obsolete Members
Creating Windows Forms for User Input
Element Operations
Delete an element - Intro to modifying the document
Create text note and get and set parameter values
Set parameter value & Check parameter storage type
Built in parameters
Collecting element area and keynote properties
Create wall
Create Family Instance (Furniture)
Create Family Instance (Door)
Element Rotation
Get Workset of an element
Element Geometry
Element Location - LocationCurve & LocationPoint
Get geometry of host faces
Get Curves and Solids of an element
Debugging Revit API Code
Step Into a Macro
Debugging external commands in Visual Studio
Intermediate / Advanced topics
Set Project Units
Selection Filters
Events
Ribbon UI - tab, panels, buttons
Write comments to the journal file
Extensible Storage
Reference Intersector
Dynamic Model Update
Source Code from BoostYourBIM blog posts
Get Categories & Materials from multiple Revit families
Record view creation date in a shared parameter
Responses to Questions
Code Samples
File Version Check
Topo From Lines"