Why are some C#4 features allowed even when targeting 3.5?
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by Greg
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Published on 2010-05-03T20:01:45Z
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2010/05/03
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visual-studio-2010
|c#4.0
We upgraded to VS 2010, but we haven't yet upgraded to .NET 4.0. All of our projects are still explicitly targeting 3.5.
Today, a developer checked in code that looked like this:
delegate T Generator<out T>();
As far as I know, "in T" and "out T" are C# 4.0 features. According to our build server, which doesn't have .NET 4.0 installed on it, I'm right. The check-in broke the build. But, why the heck does it build on his machine? Why is VS just ignoring the target framework for the project?
Other C# 4.0 features, like the dynamic keyword, do not build on the developer's machine.
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