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C Sharp Tuples

From WikiOD

Accessing tuple elements[edit | edit source]

To access tuple elements use Item1-Item8 properties. Only the properties with index number less or equal to tuple size are going to be available (i.e. one cannot access Item3 property in Tuple<T1,T2>).

var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, true, new MyClass());
var item1 = tuple.Item1; // "foo"
var item2 = tuple.Item2; // 123
var item3 = tuple.Item3; // true
var item4 = tuple.Item4; // new My Class()

Creating tuples[edit | edit source]

Tuples are created using generic types Tuple<T1>-Tuple<T1,T2,T3,T4,T5,T6,T7,T8>. Each of the types represents a tuple containing 1 to 8 elements. Elements can be of different types.

// tuple with 4 elements
var tuple = new Tuple<string, int, bool, MyClass>("foo", 123, true, new MyClass());

Tuples can also be created using static Tuple.Create methods. In this case, the types of the elements are inferred by the C# Compiler.

// tuple with 4 elements
var tuple = Tuple.Create("foo", 123, true, new MyClass());

7.0

Since C# 7.0, Tuples can be easily created using ValueTuple.

var tuple = ("foo", 123, true, new MyClass());

Elements can be named for easier decomposition.

(int number, bool flag, MyClass instance) tuple = (123, true, new MyClass());

Comparing and sorting Tuples[edit | edit source]

Tuples can be compared based on their elements.

As an example, an enumerable whose elements are of type Tuple can be sorted based on comparisons operators defined on a specified element:

List<Tuple<int, string>> list = new List<Tuple<int, string>>();
list.Add(new Tuple<int, string>(2, "foo"));
list.Add(new Tuple<int, string>(1, "bar"));
list.Add(new Tuple<int, string>(3, "qux"));

list.Sort((a, b) => a.Item2.CompareTo(b.Item2)); //sort based on the string element

foreach (var element in list) {
    Console.WriteLine(element);
}

// Output:
// (1, bar)
// (2, foo)
// (3, qux)

Or to reverse the sort use:

list.Sort((a, b) => b.Item2.CompareTo(a.Item2));

Return multiple values from a method[edit | edit source]

Tuples can be used to return multiple values from a method without using out parameters. In the following example AddMultiply is used to return two values (sum, product).

void Write()
{
    var result = AddMultiply(25, 28);
    Console.WriteLine(result.Item1);
    Console.WriteLine(result.Item2);
}

Tuple<int, int> AddMultiply(int a, int b)
{
    return new Tuple<int, int>(a + b, a * b);
}

Output:

53

700

Now C# 7.0 offers an alternative way to return multiple values from methods using value tuples More info about ValueTuple struct.

Credit:Stack_Overflow_Documentation