How to create 8-Tuple or Octuple in C#?

In C#, an 8-tuple is a tuple that contains eight elements and it is also known as Octuple. You can create an 8-tuple using two different ways:

• Using Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>(T1, T2, T3, T4, T5, T6, T7, TRest) Constructor
• Using the Create method

Using Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>(T1, T2, T3, T4, T5, T6, T7, TRest) Constructor

You can create 8-tuple using Tuple < T1, T2, T3, T4, T5, T6, T7, TRest>(T1, T2, T3, T4, T5, T6, T7, TRest) constructor. It initializes a new instance of the Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> class. But when you create a tuple using this constructor then you have to specify the type of the element stored in the tuple.

Note: If you will this constructor, then you can also create a tuple that contains eight or more than eight elements by using the rest parameter to create n-nested tuples and each tuple contains from one to seven components.

Syntax:

public Tuple (T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7, TRest rest);

Parameters:

• item1: It is the value of the first tuple component.
• item2: It is the value of the second tuple component.
• item3: It is the value of the third tuple component.
• item4: It is the value of the fourth tuple component.
• item5: It is the value of the fifth tuple component.
• item6: It is the value of the sixth tuple component.
• item7: It is the value of the seventh tuple component.
• rest: It is any generic Tuple object which contains the values of the tuple’s remaining components.

Exception: This will give ArgumentException if the rest is not a generic Tuple object.

Example:

// C# program to create 8-tuple
// using the tuple constructor
using System;

public class GFG {

    // Main method
    static public void Main()
    {

        // Creating tuple with eight elements
        // Using Tuple<T1, T2, T3, T4, T5, T6,
        // T7, TRest>(T1, T2, T3, T4, T5, T6,
        // T7, TRest) constructor
        Tuple<int, int, int, int, int, int, int, Tuple<int>> My_Tuple = new Tuple<int,
                       int, int, int, int, int, int, Tuple<int> >(22, 33, 44, 545, 55,
                                                          88, 66, new Tuple<int>(77));

        Console.WriteLine("Element 1: " + My_Tuple.Item1);
        Console.WriteLine("Element 2: " + My_Tuple.Item2);
        Console.WriteLine("Element 3: " + My_Tuple.Item3);
        Console.WriteLine("Element 4: " + My_Tuple.Item4);
        Console.WriteLine("Element 5: " + My_Tuple.Item5);
        Console.WriteLine("Element 6: " + My_Tuple.Item6);
        Console.WriteLine("Element 7: " + My_Tuple.Item7);
        Console.WriteLine("Element 8: " + +My_Tuple.Rest.Item1);
    }
}

Output:

Element 1: 22
Element 2: 33
Element 3: 44
Element 4: 545
Element 5: 55
Element 6: 88
Element 7: 66
Element 8: 77

Using Create Method

You can also create 8-tuple with the help of Create method. When you use this method then there is no need to specify the type of the elements stored in the tuple.

Syntax:

public static Tuple < T1, T2, T3, T4, T5, T6, T7, Tuple < T8>> Create < T1, T2, T3, T4, T5, T6, T7, T8> (T1 item1, T2 item2, T3 item3, T4 item4, T5 item5, T6 item6, T7 item7, T8 item8);

Type Parameters:

• T1: It is the type of the first tuple component.
• T2: It is the type of the second tuple component.
• T3: It is the type of the third tuple component.
• T4: It is the type of the fourth tuple component.
• T5: It is the type of the fifth tuple component.
• T6: It is the type of the sixth tuple component.
• T7: It is the type of the seventh tuple component.
• T8: It is the type of the eighth tuple component.

Parameters:

• item1: It is the value of the first tuple component.
• item2: It is the value of the second tuple component.
• item3: It is the value of the third tuple component.
• item4: It is the value of the fourth tuple component.
• item5: It is the value of the fifth tuple component.
• item6: It is the value of the sixth tuple component.
• item7: It is the value of the seventh tuple component.
• item8: It is the value of the eighth tuple component.

Return Type: This method returns 8-tuple whose value is item1, item2, item3, item4, item5, item6, item7, and item8.

Example:

// C# program to create 8-tuple
// using create method
using System;

public class GFG {

    // Main method
    static public void Main()
    {

        // Creating tuple with eight
        // elements Using Create method
        var My_Tuple = Tuple.Create("C", "C++", "Ruby",
             "Java", "Perl", "PHP", "Python", "Scala");

        Console.WriteLine("Element 1: " + My_Tuple.Item1);
        Console.WriteLine("Element 2: " + My_Tuple.Item2);
        Console.WriteLine("Element 3: " + My_Tuple.Item3);
        Console.WriteLine("Element 4: " + My_Tuple.Item4);
        Console.WriteLine("Element 5: " + My_Tuple.Item5);
        Console.WriteLine("Element 6: " + My_Tuple.Item6);
        Console.WriteLine("Element 7: " + My_Tuple.Item7);
        Console.WriteLine("Element 8: " + My_Tuple.Rest);
    }
}

Output:

Element 1: C
Element 2: C++
Element 3: Ruby
Element 4: Java
Element 5: Perl
Element 6: PHP
Element 7: Python
Element 8: (Scala)

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.tuple-8.-ctor?view=netframework-4.8
• https://docs.microsoft.com/en-us/dotnet/api/system.tuple.create?view=netframework-4.8#System_Tuple_Create__8___0___1___2___3___4___5___6___7_