qmlimport Add the given path to the QML module search locations. In your project, create a folder Calling current project methods from C# Interactive Window in Visual Studio 2015 ? Open Visual Studio -> New Project -> Visual C++ -> MFC Application. To display an assembly in the Add Reference dialog box If it is, check that it's built for the same CPU type as your project, and that the Reference properties option 'Copy Local' is set to true. Is there something I missed out? Source code / logs For testing purposes, I usually put the DLL and the ADDIN file both in the same folder located here: C:\ProgramData\Autodesk\Revit\Addins\2015\ (change the 2015 to the version of Revit you ware using). Choose a name for the header file, such as MathFuncsDll.
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