Is there any difference in the binary image when compiling using C# 3.

[DeveloperJr]

My understanding is that .NET 3.5 uses the 2.0 core. My question is, if I compile an assembly using C# compiler version 3.5, does it emit a different binary than 2.0 even if we didn’t change any code – only the compiler?

 

[chiph]

There will be minor differences in the compiled assembly, yes.

The major one would be that the assembly would now want v3.5 of the runtime installed.


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[AlexCuse]

If you're using VS2008 you can set target framework to 2.0 though

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[chiph]

That is true.

But even when targeting the v2.0 framework, there may be differences in the MSIL code that gets generated (the CLR team at MSFT may have learned more about creating optimized code in the 3 years since 2005 was released)

Chip H.


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[AlexCuse]

Indeed. But as you pointed out, I think (hope) that the framework prerequisite is the big one

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[DeveloperJr]

Thanks all for your feeback. Does anyone know a source I can use to read about the diffrences in the emited MSIL?

Thanks

 

[chiph]

I don't know of any published articles, sorry.

Probably the easiest way would be to compile some non-trivial code under VS.NET 2005 and 2008 (targeting the 2.0 framework), and then compare the generated MSIL using ILDASM or Reflector.

Chip H.



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