Will a future version of .NET support tuples in C#?

.Net 3.5 doesn't support tuples. Too bad, But not sure whether the future version of .net will support tuples or not?

Solution 1:

I've just read this article from the MSDN Magazine: Building Tuple

Here are excerpts:

The upcoming 4.0 release of Microsoft .NET Framework introduces a new type called System.Tuple. System.Tuple is a fixed-size collection of heterogeneously typed data.

Like an array, a tuple has a fixed size that can't be changed once it has been created. Unlike an array, each element in a tuple may be a different type, and a tuple is able to guarantee strong typing for each element.

There is already one example of a tuple floating around the Microsoft .NET Framework, in the System.Collections.Generic namespace: KeyValuePair. While KeyValuePair can be thought of as the same as Tuple, since they are both types that hold two things, KeyValuePair feels different from Tuple because it evokes a relationship between the two values it stores (and with good reason, as it supports the Dictionary class).

Furthermore, tuples can be arbitrarily sized, whereas KeyValuePair holds only two things: a key and a value.

While some languages like F# have special syntax for tuples, you can use the new common tuple type from any language. Revisiting the first example, we can see that while useful, tuples can be overly verbose in languages without syntax for a tuple:

class Program {
    static void Main(string[] args) {
        Tuple<string, int> t = new Tuple<string, int>("Hello", 4);
        PrintStringAndInt(t.Item1, t.Item2);
    }
    static void PrintStringAndInt(string s, int i) {
        Console.WriteLine("{0} {1}", s, i);
    }
}

Using the var keyword from C# 3.0, we can remove the type signature on the tuple variable, which allows for somewhat more readable code.

var t = new Tuple<string, int>("Hello", 4);

We've also added some factory methods to a static Tuple class which makes it easier to build tuples in a language that supports type inference, like C#.

var t = Tuple.Create("Hello", 4);

Solution 2:

#region tuples

    public class Tuple<T>
    {
        public Tuple(T first)
        {
            First = first;
        }

        public T First { get; set; }
    }

    public class Tuple<T, T2> : Tuple<T>
    {
        public Tuple(T first, T2 second)
            : base(first)
        {
            Second = second;
        }

        public T2 Second { get; set; }
    }

    public class Tuple<T, T2, T3> : Tuple<T, T2>
    {
        public Tuple(T first, T2 second, T3 third)
            : base(first, second)
        {
            Third = third;
        }

        public T3 Third { get; set; }
    }

    public class Tuple<T, T2, T3, T4> : Tuple<T, T2, T3>
    {
        public Tuple(T first, T2 second, T3 third, T4 fourth)
            : base(first, second, third)
        {
            Fourth = fourth;
        }

        public T4 Fourth { get; set; }
    }

    #endregion

And to make declarations prettier:

public static class Tuple
{
    //Allows Tuple.New(1, "2") instead of new Tuple<int, string>(1, "2")
    public static Tuple<T1, T2> New<T1, T2>(T1 t1, T2 t2)
    {
        return new Tuple<T1, T2>(t1, t2);
    }
    //etc...
}

Solution 3:

There is a proper (not quick) C# Tuple implementation in Lokad Shared Libraries (Open-source, of course) that includes following required features:

2-5 immutable tuple implementations
Proper DebuggerDisplayAttribute
Proper hashing and equality checks
Helpers for generating tuples from the provided parameters (generics are inferred by compiler) and extensions for collection-based operations.
production-tested.

Solution 4:

Implementing Tuple classes or reusing F# classes within C# is only half the story - these give you the ability to create tuples with relative ease, but not really the syntactic sugar which makes them so nice to use in languages like F#.

For example in F# you can use pattern matching to extract both parts of a tuple within a let statment, eg

let (a, b) = someTupleFunc

Unfortunately to do the same using the F# classes from C# would be much less elegant:

Tuple<int,int> x = someTupleFunc();
int a = x.get_Item1();
int b = x.get_Item2();

Tuples represent a powerful method for returning multiple values from a function call without the need to litter your code with throwaway classes, or resorting to ugly ref or out parameters. However, in my opinion, without some syntactic sugar to make their creation and access more elegant, they are of limited use.

Solution 5:

In my opinion, the anonymous types feature is not a tuple, but a very similar construct. The output of some LINQ Queries are collections of anonymous types, which behave like tuples.

Here is a statement, which creates a typed tuple :-) on the fly:

var p1 = new {a = "A", b = 3};

see: http://www.developer.com/net/csharp/article.php/3589916