Roslyn: Proposal: Language "using" blocks with multiple resources

[doktrova]

This is more a feature than an issue. It would be nice if we can use "using" block with multiple resources such as below:
using(var custSvc = new CustomerService(), var empSvc = new EmployeeService()) { }

I do not for see any limitations to being able to achieve this but I could be wrong.

[svick]

This is a duplicate of https://github.com/dotnet/roslyn/issues/2331 (only with , instead of ;), which was closed as "Won't fix" by @gafter:

The benefit of this proposal seems close to zero, plus or minus epsilon.

[doktrova]

The benefit is readability. It prevents nested usings or declaring one resurce in a using and the other not which makes it inconsistent.

[svick]

You don't need to nest usings in blocks:

c# using (var custSvc = new CustomerService()) using (var empSvc = new EmployeeService()) { }

[doktrova]

That's good enough then, at least in the surface. I wonder if ugly nested 'try.. catch.. finally..' get created in the background but that's a different issue.

[alrz]

VB version also generates two try block.

using custSvc = new CustomerService(), empSvc = new EmployeeService()
end using   

Not sure if it incurs any performance penalties, though.

[gafter]

Dup of #2331