Learn to program the Revit API by Boost Your BIM

Prompt the user to select an element and retrieve data from that element.

The "Exception Handling" lecture is recommended to learn how to handle the user pushing the ESC key during a selection prompt.

Get the elements selected in the Revit UI and use the API to set which elements are selected.

Find elements in a Revit model using filters by Class (such as Wall or FamilyInstance) and Category (such as Door and Window)

Find elements that are visible in a specific view.

Find elements whose bounding box is inside a 3D space defined by two mouse-clicks

Use LINQ (Language-Integrated Query) syntax to develop more sophisticated queries of elements in the Revit model

Create an external command using Visual Studio Express

Create family types, family parameters, and set parameter values

Get the length of multiple selected lines and convert their total length from feet (Revit's internal units for length) to the project's units

Revit macros to read and write text files

Find the TEMP folder and the My Documents folder, combine folder and file names, and find all files in a folder.

Read data from Excel into a Revit API external command

How to write Revit data to an Excel file in a Revit API external command.

Includes using the Process.Start command to open a file in its default application.

You can get the EPPlus component for Excel read/write with NuGet (https://www.nuget.org/)

"An essential tool for any modern development platform is a mechanism through which developers can create, share, and consume useful code. Often such code is bundled into "packages" that contain compiled code (as DLLs) along with other content needed in the projects that consume these packages.

For .NET (including .NET Core), the Microsoft-supported mechanism for sharing code is NuGet, which defines how packages for .NET are created, hosted, and consumed, and provides the tools for each of those roles."

In Visual Studio go to Tools - NuGet Package Manager - Manage NuGet Packages for Solution - then browse for EPPlus. Select EPPlus by Jan Kallman

Or you can download the DLL from https://drive.google.com/file/d/1q1ZnRpK4XLdstVzbK3oUc0Qf61-3kLIA/view?usp=sharing or attached to this lecture. If you do that, be sure to unblock the DLL (right click on it in Windows Explorer, select Properties, Unblock) after downloading it.

How to handle exceptions (errors) that occur while running your Revit API code.

How to write and reuse functions that make your code easier to update and maintain with fewer bugs.

What it means when a member of the Revit API is marked "obsolete"

Create a Windows Form dialog to allow the user to enter information that will be used by an API command

How to modify the Revit Document and delete an element

Create a text note

How to check the type of a parameter (string, integer, double, element id) and set its value

Get data from a Revit element using Built In Parameters

How to create a Furniture family instance

Find the point or curve that defines the location of an element

Find area of faces of walls, floors, roofs, and other host objects.

Watch "Code Reuse" lecture to learn how to improve the code shown here.

Step Into a Macro to debug your macro code. Set breakpoints and create watches in SharpDevelop to see what is happening as your code executes.

How to prompt the user for a selection and only allow selection of specific categories

How to register an event to automatically run Revit API code when specific actions occur in the Revit session.

The DocumentSaving event is demonstrated in this lecture to show how to create and update a log file with the time of save and the user's name.

Create a ribbon tab, panels, and buttons with an external application

Store data in Revit elements that is accessible only via the Revit API

How to "see" in the Revit model by shooting imaginary arrows and finding out what they hit

How your API code can automatically react to user changes in the Revit model