08 Aug C# Tuple
C# Tuple is a data structure introduced in 4.0. It has elements with multiple parts i.e., more than one data type. In a Tuple, you can easily store duplicate elements. Also, a tuple returns values from a method without using the out parameter.
In C# Tuples, elements can only be added from 1 to 8. An error would be thrown, if you try to add more than 8 elements. However, you can use Nested Tuple to add more than 8 elements. To display the 8th element, use the Rest property. Rest, the 1st 7 items can be accessed using Item1, Item2, Item3, etc. properties.
Create a Tuple
To create a Tuple, there are two ways:
- Create a Tuple using its Constructor
- Create a Tuple using the Create() method
Create a Tuple using its constructor
Let us see an example of creating a tuple. We will also see how to access the values using the Item property. The 1st 7 items can be accessed using the Item property, i.e., Item1, Item2, Item3, etc. properties:
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using System; using System.Collections; using System.Collections.Generic; namespace Studyopedia { class Program { static void Main(string[] args) { // Create a 2-tuple Tuple<string, string>myTuple = new Tuple<string, string>("Sachin", "India"); // Display the tuple items System.Console.WriteLine("Player {0} from {1}.", myTuple.Item1, myTuple.Item2); } } } |
Output
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Player Sachin from India. |
Create a Tuple using the Create() method
Let us see an example of creating a tuple using the Create() method. We will also see how to access the values using the Item property. The 1st 7 items can be accessed using the Item property, i.e., Item1, Item2, Item3, etc. properties:
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using System; using System.Collections; using System.Collections.Generic; namespace Studyopedia { class Program { static void Main(string[] args) { // Create a 2-tuple using the Create() method var myTuple = Tuple.Create("Sachin", "India"); // Display the tuple items System.Console.WriteLine("Player {0} from {1}.", myTuple.Item1, myTuple.Item2); } } } |
Output
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Player Sachin from India. |
Access Tuple elements/ items
Since, a Tuple in C# can have 8 elements, to display the 8th element, use the Rest property. Rest, the 1st 7 items can be accessed using the Item property, i.e., Item1, Item2, Item3, etc. properties.
Let us see an example and create a Tuple with 8 elements and access each element one by one:
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using System; using System.Collections; using System.Collections.Generic; namespace Studyopedia { class Program { static void Main(string[] args) { // Create a 8-tuple using the Create() method var myTuple = Tuple.Create("India", "Australia", "England", "Bangladesh", "Sri Lanka", "New Zealand", "West Indies", "Afghanistan"); // Display the tuple items System.Console.WriteLine("Country 1 = "+myTuple.Item1); System.Console.WriteLine("Country 2 = "+myTuple.Item2); System.Console.WriteLine("Country 3 = "+myTuple.Item3); System.Console.WriteLine("Country 4 = "+myTuple.Item4); System.Console.WriteLine("Country 5 = "+myTuple.Item5); System.Console.WriteLine("Country 6 = "+myTuple.Item6); System.Console.WriteLine("Country 7 = "+myTuple.Item7); // For the 8th item, use the Tuple Rest property System.Console.WriteLine("Country 8 = "+myTuple.Rest); } } } |
Output
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Country 1 = India Country 2 = Australia Country 3 = England Country 4 = Bangladesh Country 5 = Sri Lanka Country 6 = New Zealand Country 7 = West Indies Country 8 = (Afghanistan) |
Nested Tuples
Use Nested Tuples in C# to add more than 8 elements. Those can be easily accessed using the Rest property in C#. Let us see an example:
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using System; using System.Collections; using System.Collections.Generic; namespace Studyopedia { class Program { static void Main(string[] args) { // Create a 8-tuple using the Create() method var myTuple = Tuple.Create("India", "Australia", "England", "Bangladesh", "Sri Lanka", "New Zealand", "West Indies", Tuple.Create(100, 200)); // Display the tuple items System.Console.WriteLine("Country 1 = "+myTuple.Item1); System.Console.WriteLine("Country 2 = "+myTuple.Item2); System.Console.WriteLine("Country 3 = "+myTuple.Item3); System.Console.WriteLine("Country 4 = "+myTuple.Item4); System.Console.WriteLine("Country 5 = "+myTuple.Item5); System.Console.WriteLine("Country 6 = "+myTuple.Item6); System.Console.WriteLine("Country 7 = "+myTuple.Item7); // For the Nested Tuple items, use the Tuple Rest property System.Console.WriteLine("Nested Tuple Item 1 = "+myTuple.Rest.Item1.Item1); System.Console.WriteLine("Nested Tuple Item 2 = "+myTuple.Rest.Item1.Item2); } } } |
Output
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Country 1 = India Country 2 = Australia Country 3 = England Country 4 = Bangladesh Country 5 = Sri Lanka Country 6 = New Zealand Country 7 = West Indies Nested Tuple Item 1 = 100 Nested Tuple Item 2 = 200 |
To get only the nested tuple, use the following:
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myTuple.Rest.Item1 |
The output would display the entire Nested Tuple:
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(100, 200) |
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