There are a a lot of questions and answers around AOP in .NET here on Stack Overflow, often mentioning PostSharp and other third-party products. So there seems to be quite a range of AOP optons in the .NET and C# world. But each of those has their restrictions, and after downloading the promising PostSharp I found in their documentation that 'methods have to be virtual' in order to be able to inject code (edit: see ChrisWue's answer and my comment - the virtual constraint must have been on one of the contenders, I suppose). I haven't investigated the accuracy of this statement any further, but it's categoricality made me return back to Stack Overflow.
So I'd like to get an answer to this very specific question:
I want to inject simple "if (some-condition) Console.WriteLine" style code to every method and property (static, sealed, internal, virtual, non-virtual, doesn't matter) in my project that does not have a custom annotation, in order to dynamically test my software at run-time. This injected code should not remain in the release build, it is just meant for dynamic testing (thread-related) during development.
What's the easiest way to do this? I stumbled upon Mono.Cecil, which looks ideal, except that you seem to have to write the code that you want to inject in IL. This isn't a huge problem, it's easy to use Mono.Cecil to get an IL version of code written in C#. But nevertheless, if there was something simpler, ideally even built into .NET (I'm still on .NET 3.5), I'd like to know. [Update: If the suggested tool is not part of the .NET Framework, it would be nice if it was open-source, like Mono.Cecil, or freely available]