How to unbox tuple?

Question

I have boxed tuple:

(int, string) tuple = (1, "abc");
object box = tuple;

How to obtain tuple from box? What is the right syntax to cast object back to tuple?

My attempt:

var deconstruct = (int, string)box;

is obviously wrong:

Error CS1525 Invalid expression term 'int'

Error CS1525 Invalid expression term 'string'

Error CS1002 ; expected

Error CS0201 Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement

have you tried (int, string) deconstruct = (int, string)box; — demoncrate, Oct 22 '19 at 14:21
The syntax of casts is `(type) expr`. The type of the tuple is `(int, string)`. Ergo: `((int, string)) box`. — Jeroen Mostert, Oct 22 '19 at 14:21
@JeroenMostert, after seeing the answer its obvious, I was somehow blinded by already having one set of bracers. — Sinatr, Oct 22 '19 at 14:30
It's not the most readable syntax, even though it follows a logical pattern -- we can blame C for introducing that cast syntax in the first place (the tuple syntax seems fine). — Jeroen Mostert, Oct 22 '19 at 14:36

score 12 · Accepted Answer · answered Oct 22 '19 at 14:23

12

ValueTuple<int, string> t = (ValueTuple<int, string>)box;

or

(int, string) t = ((int, string))box;

answered Oct 22 '19 at 14:23

mm8

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Easy! One pair for the tuple, the other for the cast. – Paulo Morgado Oct 22 '19 at 20:49

How to unbox tuple?

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