What language is .NET Framework written in?

.net c++ programming-languages
chester89 picture chester89 · Aug 24, 2009 · Viewed 17.8k times · Source

The question I always wanted to ask and was afraid to, actually - what language is .NET Framework written in? I mean library itself.
It seems to me that it was C and C++ mostly. (I hope Jon Skeet is reading this one, it`ll be very interesting to hear what he thinks about it)

Answer

Jaimal Chohan picture Jaimal Chohan · Aug 24, 2009

The CLI/CLR is written in C/C++ and assembly. Almost all of the .NET framework classes are written in C# > compiled to IL, which runs in the CLR. If you crack open a framework library in Reflector, class, you may see an attribute such as [MethodImpl(MethodImplOptions.InternalCall)] which delegates the call to the CLI.

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