如何在 F# 列表和 F# 元组之间进行转换? [英] How can i convert between F# List and F# Tuple?

问题描述

是否有某种方法可以在 F# 列表和 F# 元组之间进行转换?

Is there some way to convert between F# List and F# Tuple?

例如:

[1;2;3] -> (1,2,3)    
(1,2,3,4) -> [1;2;3;4]

我需要两个函数来做到这一点:

I need two Functions to do that:

let listToTuple list = ...
let tupleToList tuple = ...

提前致谢.

推荐答案

除了 listToTuple 之外，pblasucci 还有正确的答案.但是除非您对所涉及的类型类型有所了解，或者不想进行大量装箱和拆箱操作，否则您不会对结果感到满意.

Besides listToTuple then pblasucci has the right answer. But you wont be happy with the result unless you know something about type types involved, or if you wan't to do a lot of boxing and unboxing.

let tupleToList t = 
    if Microsoft.FSharp.Reflection.FSharpType.IsTuple(t.GetType()) 
        then Some (Microsoft.FSharp.Reflection.FSharpValue.GetTupleFields t |> Array.toList)
        else None

let listToTuple l =
    let l' = List.toArray l
    let types = l' |> Array.map (fun o -> o.GetType())
    let tupleType = Microsoft.FSharp.Reflection.FSharpType.MakeTupleType types
    Microsoft.FSharp.Reflection.FSharpValue.MakeTuple (l' , tupleType)

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