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C# - ValueTuple <T1,T2,T3,T4,T5,T6,T7,TRest> Struct

Last Updated : 11 Jul, 2025

<ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> struct in C# is part of the System namespace and is used to create n-ValueTuple where n = 8 or greater than 8. It offers a more lightweight, value-type tuple compared to the older Tuple class and provides better performance and memory management. The ValueTuple struct is a value type and mutable means the value of its elements can be modified. Some key features of tuples are mentioned below:

• Mutable: The value of the Item(fields) can be changed after the tuple is created.
• Type-Safe: The field is specified when the tuple is created, ensuring type safety.
• Implements Interfaces: <ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest>, implements several interfaces such as:
  • IStructuralComparable
  • IStructuralEquatable
  • IComparable<ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest>
  • IEquatable<ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest>
  • ITuple: This makes it useful in various comparison and equality scenarios.

// Initializes a new ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest>(T1, T2, T3, T4, T5, T6, T7, TRest)

The constructor of the ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> struct initializes the tuple with seven values, Including the optional TRest that can represent additional elements, Accessed via fields ValueTuple<ElementNumber>.

• Item1: Retrieves the 1st element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item2: Retrieves the 2nd element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item3: Retrieves the 3rd element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item4: Retrieves the 4th element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item5: Retrieves the 5th element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item6: Retrieves the 6th element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• Item7: Retrieves the 7th element of the current ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> instance.
• TRest: Any generic value tuple instance that defines the types of the tuple’s remaining elements.

Example:

// Accessing the element of ValueTuple<T1, 
// T2, T3, T4, T5, T6, T7, TRest> 
using System; 

class Geeks
{
	static public void Main()
	{
		// Creating a value tuple using Create method 
		var lib = ValueTuple.Create(3, "C#", "Geek",
		2025, "Programming", "English", "India", 
		ValueTuple.Create("Java", "Javascript",  
        "Kotlin"));

		// Display the element of the value-tuple 
		Console.WriteLine("Details: ");
		Console.WriteLine("Book Id: {0}", lib.Item1);
		Console.WriteLine("Book Name: {0}", lib.Item2);
		Console.WriteLine("Author Name: {0}", lib.Item3);
		Console.WriteLine("Publication date: {0}", lib.Item4);
		Console.WriteLine("Gener: {0}", lib.Item5);
		Console.WriteLine("Language: {0}", lib.Item6);
		Console.WriteLine("Country: {0}", lib.Item7);
		Console.WriteLine("Other Books Details: " + lib.Rest);

	}
}

Details: 
Book Id: 3
Book Name: C#
Author Name: Geek
Publication date: 2025
Gener: Programming
Language: English
Country: India
Other Books Details: ((Java, Javascript, Kotlin))

Explanation: In the above example, we create a ValueTuple with seven elements and one nested valueTuple of different types and print each element by field Item<elementNumber> and nested valuetuple using ValutupleObject.Rest(Instance).

Methods

Description

CompareTo(ValueTuple)

Compares two tuples element by element and returns (0,1,-1) value based on their order.

Equals(Object)

Check the Object equal to the current ValueTuple instance, return true if equals else return false

Equals(ValueTuple)

Checks if two ValueTuple instances are equal by comparing their elements, return true if equals else return false

GetHashCode()

Calculates the hash code for the current ValueTuple instance.

ToString()

Returns a string that represents the value of current ValueTuple instance.

Example:

// Demonstration of Equals() Method in ValueTuple
using System;

class Geeks
{
	static public void Main()
	{
		// Creating 8-ValueTuple using Create method 
		var T1 = ValueTuple.Create(1, 2, 3, 4, 5, 6, 7 ,8);
		var T2 = ValueTuple.Create(1, 2, 3, 4, 5, 6, 7, 8);

		// Check if both the value 
		// tuples are equal or not 
		if (T1.Equals(T2)) {
			Console.WriteLine("Tuples Matched...!!");
		}
		else {
			Console.WriteLine("Tuples Not Matched...!!");
		}
	}
}

Tuples Matched...!!

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