From the course: Revit: Creating C# Plugins

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The IExternalCommand

The IExternalCommand

From the course: Revit: Creating C# Plugins

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The IExternalCommand

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- [Instructor] To create our first Revit plug-in command, we're creating what is called an external command. External commands are essentially exposed objects that implement the IExternal Command interface. They, in turn, become commands in Revit that can access the Revit database and selected elements. If you haven't heard the term interface before, this is a type in Csharp that contains related members such as methods and properties that can be implemented by a class or strut. When we compile our code into a DLL or dynamic link library, Revit will rate this DLL and any IExternal command classes we create, will be added on to the Revit interface under the add-ins tab to then be executed. Provided it utilizes the IExternal command interface correctly. And it is described in a manifest file, which we'll learn about later. The IExternal command interface has one method, execute. Which needs to be defined in the command class. This will run when the command is pressed in Revit. When a…

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