How to set .Net 4.0 as the default framework in MonoDevelop (Unity 3D)

Question

I'm using MonoDevelop version 2.8.2 and the default parameters that are available in the .NET 4.0 framework. My first problem was that every time I reloaded MD the .NET runtime would be reset to 3.0, and I would have to change it again. This wasn't too annoying, but I do also want to know why that kept happening and how I might permanently set it.

My real issue now is that the .NET Runtime (or whatever it specifically was, I can't remember) under the Options dropdown no longer appears. Instead, I see a disabled Project Options.

(I'd put an image of what I see here, but apparently I need reputation.)

If even one of these issues is fixed, I should be fine. But right now I can't rely on the errors messages from the IDE, and have to switch back to Unity.

Answer 1

Unity3D v4.2 is currently using Mono v2.6 or so, and only supports equivalent .NET versions of 3.5 or lower. I don't believe it even supports all corners of .NET 3.5 either.

Officially Unity only supports .NET 2.0. See the supported functions here.

The best you can do is change the API Compatibility Level from v2.0-subset to v2.0 in Player Settings.