Friedrich Eder (@f_eder) and me have developed some C#-based tools for handling the IFC-model in files and relational databases.
It is stored under https://github.com/IfcSharp
Following the link you will find the Repositories for the examples (IfcSharpApps) utilizing the underlying API tools (IfcSharpLibray).
The libraries were tested with some small ‘proof of concept’-examples, so it will probably not work flawlessly with every existing IFC-File.
We hope that our work might inspire some of you.