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weird problem…
Ive implemented covariance from example .
My target FW is 4.0.
How ever . I wanted to see if it fails on 3.5 /2 -> but it wont.
It cant be since covariance is from FW4.0.
After changing to 3.0 i Build and see : (+wont fail on runtime)
Covariance was supported in framework 3, but not implemented in the compiler. You are using compiler 4 targeting framework 3.
This is mentioned in an Eric Lippert blog post, I’ll see if I can find it..
EDIT
To further clarify,: The Common Language Runtime and the C# compiler (csc.exe) are two separate things. Covariance and Contravariance where introduced to the CLR at version 2.0. They were not introduced to C# until version 4. You are using Compiler 4 to build version 3 IL which is why it works.