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Asked: 2026-05-15T10:04:02+00:00

One of the Tuple Types in .net 4 is a Single-Element Tuple . I

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One of the Tuple Types in .net 4 is a Single-Element Tuple. I just wonder what the purpose of this struct is?

The only use I saw is when using in the 8+ Tuple as it can be assigned to TRest, where it actually makes sense. Is that it? Or is there any other purpose?

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  1. Editorial Team

    You’d have to ask the BCL designers to be certain, but I suspect that since there is a 1-tuples in the real world, the .NET framework authors wanted to provide equivalent symmetry in their implementation.

    Tuples are the .NET implementation of what you’d consider the mathematical concept of a tuple.

    Now since you’re asking for programming uses for Tuple<T>, I would also answer that there are .NET languages (like F#) that could use Tuple<> for representation of things like return values from functions. Since an F# function could certainly return a 1-tuple as a result – it adds symmetry and consistency to the behavior and feel of the language.

    Your example with 8+ tuples is also probably legitimate, in that the Rest property could be a 1-tuple to represent the “overflow”.

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