Does we have the same level of api access(access Bentley DGN files with full fidelity) when develop extension on top of Microstation with a C# addin and a MDL application.

Hi all, 

  I am new to Microstation development, and recently i want to develop an extension which is to "read" DGN file data(geometry, properties, reference...), i am not familiar with the MDL development environment( especially about the make file, resource file..),  and would like to start with an C# addin, this environment is familiar to me and i can quickly start and focus on my logic.  but i am not sure whether i have the same level access to the APIs, i have read a lot threads, wikis, and seems the MDL application have more api access to the DGN file filed. what i need is just to read the DGN file information(geometry, properties, references..)

can any expert help me confirm whether i can get the same level api access if i start with an C# addin, from the DGN file "read" perspertive, access Bentley DGN files with full fidelity.

and by the way, the DGN file is generated by AECOsim.

thanks,

Rick

.