I have been searching on the net of a Mediafire API for C#. I gently saw this API from Google. It has a note that it needs Resharper so I think you need that plugin before you can use it. As for the testing I don’t have any Resharper yet so I can test it myself so I have decided to publish it here so you can use and try it. You may give some feed back of your trying and share it to the world!
Mirror Download: Mediafire API C# + Resharper