Unity3D TypeLoadException

Question

I'm trying to connect to a MySQL database through Unity. I've added a reference to System.Data in visual studio but unity is throwing the following error:

TypeLoadException: Could not load type 'System.Runtime.ExceptionServices.HandleProcessCorruptedStateExceptionsAttribute' from assembly 'System.Data'.

I've googled how to solve this issue, or what it actually means, but I can't find anything.

Is anyone able to shed some light on this and what I should do to fix it?

Answer 1

Unity is using mono, not .NET. Because HandleProcessCorruptedStateExceptionsAttribute is a class from the .NET-framework 4.5, Unity can't load this class. You need to tell Visual Studio, that is mustn't compile against .NET-framework 4.5, but instead, you need to specify version 3.5 in your project-settings.