ValueTuple Struct in C#

In C#, ValueTuple structure provides static methods that are used in creating value tuples. It is defined under System namespace. It is introduced in .NET Framework 4.7 which provides runtime implementation tuples in C#. The ValueTuple structure is used to represent a tuple which does not contain any element. Generally, it provides static methods that are used for creating or comparing value tuples. With the help of ValueTuple structure’s Create method, you can create a value tuple which holds elements starting from 0 to 8. It is different from the Tuple class in the following terms:

• It is of value type not reference type.
• It is mutable rather than read-only.
• In ValueTuple, item1, item2, item3, etc. data members are fields rather than properties.

This structure implements IStructuralComparable, IStructuralEquatable, IComparable, IComparable<ValueTuple>, IEquatable<ValueTuple>, and ITuple interfaces.

Methods

Method	Description
CompareTo(ValueTuple)	Compares the current ValueTuple instance to a specified ValueTuple instance.
Create()	Creates a new value tuple with zero components.
Create<T1, T2, T3, T4, T5, T6, T7, T8>(T1, T2, T3, T4, T5, T6, T7, T8)	Creates a new value tuple with 8 components (an octuple).
Create<T1, T2, T3, T4, T5, T6, T7>(T1, T2, T3, T4, T5, T6, T7)	Creates a new value tuple with 7 components (a septuple).
Create<T1, T2, T3, T4, T5, T6>(T1, T2, T3, T4, T5, T6)	Creates a new value tuple with 6 components (a sexuple).
Create<T1, T2, T3, T4, T5>(T1, T2, T3, T4, T5)	Creates a new value tuple with 5 components (a quintuple).
Create<T1, T2, T3, T4>(T1, T2, T3, T4)	Creates a new value tuple with 4 components (a quadruple).
Create<T1, T2, T3>(T1, T2, T3)	Creates a new value tuple with 3 components (a triple).
Create<T1, T2>(T1, T2)	Creates a new value tuple with 2 components (a pair).
Create<T1>(T1)	Creates a new value tuple with 1 component (a singleton).
Equals(ValueTuple)	Determines whether two ValueTuple instances are equal. This method always returns true.
Equals(Object)	Returns a value that indicates whether the current ValueTuple instance is equal to a specified object.
GetHashCode()	Returns the hash code for the current ValueTuple instance.
ToString()	Returns the string representation of this ValueTuple instance.

Example:

// C# program to illustrate the
// methods of ValueTuple struct
using System;

class GFG {

    // Main method
    static public void Main()
    {

        // Creating a value tuple with
        // zero element using Create method
        var MyTple1 = ValueTuple.Create();

        // Using GetHashCode method
        Console.WriteLine("HashCode of a value tuple with "+
                 "zero elements: " + MyTple1.GetHashCode());

        // Creating a value tuple
        var MyTple2 = ValueTuple.Create(56, 3);
        var MyTple3 = ValueTuple.Create(56, 45);

        // Using CompareTo method
        int res1 = MyTple2.CompareTo(MyTple3);

        // Display result
        Console.WriteLine("CompareTo Method Result: " + res1);
    }
}

Output:

HashCode of a value tuple with zero elements: 0
CompareTo Method Result: -1

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.valuetuple?view=netframework-4.8