Puzzle:

What will it print?

Well – it calls the object overload all 3 times…

Lets see the IL

So – you see that it does the cast to !T (generic parameter T) but it STILL calls the ‘object’ override in L_0008. I have played and played with this. There is another IL syntax that shows !1, etc for the VALUE OF generic parameter 1 I believe, but the IL does not get generated to call the object override.

This is a somewhat contrived example, but I have on a few times now (this is why I am complaining at this point) tried to use a genric as a parameterized type for a block of code that needed simply to have that – a parameterized type. That said – a generic value WILL NEVER call the polymorphic overrides – it will always use object. It seems that there is IL that COULD be generated (the !1 – etc. syntax), but it is not.

So – there is my rant. Generics are a great tool, but sometimes they can cause a headache

-Chris

One Response to “Generics are odd at times in .net”

1. mchen, on March 2nd, 2007 at 5:49 pm, said:
   

   I think this is because of the same reason why overloaded operators (+/-, etc) don’t work with generic types. While polymorphinism and generics are evaluated at runtime, method overload is evaluated at compile time.

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