问题描述
.net 4 中的元组类型之一是 单元素元组.我只是想知道这个结构的目的是什么?
One of the Tuple Types in .net 4 is a Single-Element Tuple. I just wonder what the purpose of this struct is?
我看到的唯一用途是在 8+ 元组 因为它可以分配给 TREST，它实际上是有意义的.是这样吗?还是有其他目的?
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?
推荐答案
你得问 BCL 设计者才能确定，但我怀疑既然现实世界中有一个 1-tuples，.NET 框架作者希望在他们的实现中提供等效的对称性.
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 是您认为的 数学概念的 .NET 实现一个元组.
现在，既然您要求 Tuple<T> 的编程用途，我会也回答有 .NET 语言(如 F#)可以使用 Tuple 用于表示函数的返回值等事物.由于 F# 函数肯定会返回一个 1 元组作为结果 - 它为语言的行为和感觉增加了对称性和一致性.
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.
您的包含 8 个以上元组的示例也可能是合法的，因为 Rest 属性可以是表示溢出"的 1 元组.
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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