In C# can you define an alias to a value tuple with names?

问题

I know it's possible to define aliases in C# with the using keyword.

e.g.

using ResponseKey = System.ValueTuple<System.Guid, string, string>;

However, is it possible to define one using the new syntax for value tuples?

using ResponseKey = (Guid venueId, string contentId, string answer);

This syntax does not appear to work. Should it?

回答1:

This has been requested, and recorded in the Roslyn repo on Github. However it received a mixed reception there, and the proposed record types, would more than cover this requirement.

The issue was closed in the Roslyn repo but is now being tracked in the C# language repo.

回答2:

using is defined as: using identifier = namespace-or-type-name; (MSDN).

(Guid venueId, string contentId, string answer) is neither a namespace nor a (fully qualified) type name.

But I am mostly guessing. Was not even aware C# 7.0 existed until now.

来源：https://stackoverflow.com/questions/43181070/in-c-sharp-can-you-define-an-alias-to-a-value-tuple-with-names