c# - 解构 C# 元组

Question

是否可以在 C# 中解构元组，类似于 F#？例如，在 F# 中，我可以这样做:

// in F#
let tupleExample = (1234,"ASDF")
let (x,y) = tupleExample
// x has type int
// y has type string

是否可以在 C# 中做类似的事情？例如

// in C#
var tupleExample = Tuple.Create(1234,"ASDF");
var (x,y) = tupleExample;
// Compile Error. Maybe I can do this if I use an external library, e.g. LINQ?

还是我必须手动使用 Item1、Item2？例如

// in C#
var tupleExample = Tuple.Create(1234,"ASDF");
var x = tupleExample.Item1;
var y = tupleExample.Item2;

Answer 1

您可以使用 Deconstruction但您应该为此目的使用 C#7:

Another way to consume tuples is to deconstruct them. A deconstructing declaration is a syntax for splitting a tuple (or other value) into its parts and assigning those parts individually to fresh variables

因此以下内容在 C#7 中有效:

var tupleExample = Tuple.Create(1234, "ASDF");
//Or even simpler in C#7 
var tupleExample = (1234, "ASDF");//Represents a value tuple 
var (x, y) = tupleExample;

Deconstruct 方法也可以是扩展方法，如果您想解构不属于您的类型，它会很有用。例如，旧的 System.Tuple 类可以使用像这样的扩展方法来解构: ( Tuple deconstruction in C# 7 ):

public static void Deconstruct<T1, T2>(this Tuple<T1, T2> tuple, out T1 item1, out T2 item2)
{
    item1 = tuple.Item1;
    item2 = tuple.Item2;
}