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I'm not 100% sure, but C#'s compiler should automatically capture what you need (and leave out the rest). I think the primary need for manual declaration is be

• noblethrasher 10y ago
  Yep, in Microsoft’s C# compiler, only the closed over local variables of a function are captured (which, in C#’s case, means generating a class with fields corresponding to each closed over local, and then replacing those locals with references to their respective fields of an instance of that class).
• masklinn 10y ago
  > I think the primary need for manual declaration is because in C++ you need to differentiate between pass by copy semantics and pass by reference semantics. That's not actually a need, C++ includes [=] and [&] (capture everything by value or by reference). You can get a mix by creating references outside the body then capturing the environment by value (capturing the references by value and thus getting references). On the one hand it has a bit more syntactic overhead (you have to take and declare a bunch of references before creating the closure), on the other hand there's less irregularity to the language, and bindings mean the same thing in and out of the closure. FWIW that's what Rust does[0], though it may help that Rust's blocks are "statement expressions", some constructs would probably be unwieldy without that. [0] the default corresponds to C++'s [&] (capture by ref), and a "move closure" switches to [=] instead