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Posted 4 Aug 2010
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Tuple in C# 4.0

, 11 Aug 2010
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This article explains the new data type “Tuple” introduced by framework 4.0.

What is a Tuple?

In mathematics, A Tuple is a sequence of finite length. An n-tuple is a tuple with n elements. For example (2, 4, 3, 8) is a 4-tuple.

C# 4.0 introduced a new data type Tuple. Tuple is not new in software engineering, but of course it is new in .NET framework 4.0. A tuple is a simple generic data structure that holds an ordered set of items of heterogeneous types. There are two ways to instantiate Tuple by calling either the Tuple constructor or the static Tuple.Create() method.

// Instantiate using constructor
Tuple<int, string, int> t1 = new Tuple<int, string, int>(3, "Frank", 9);

// Instantiate using create method
Tuple<int, int, int> t2 = Tuple.Create(3, 5, 9);

Tuple constructor and create() method can contain a maximum of 8 parameters. You have to take care of the 8th parameter because it replaces another tuple object.

Simple Use of Tuple

You can easily return more than one value from method without using out or ref parameters.

public Tuple<int, int> SplitPoints(string point)
   string[] pointList = point.Split(',');

   int x = Convert.ToInt32(pointList[0]);
   int y = Convert.ToInt32(pointList[1]);
   return Tuple.Create<int, int>(x, y);

SplitPoints method split the points and returns x and y points in tuple.

Tuple<int,int> points = SplitPoints("12,14");
string msg = string.Format("X: {0}, Y: {1}", points.Item1, points.Item2);

You can get the returned values from exposed properties Item1, Item2, etc. by Tuple object. Item properties of Tuple object are readonly. You can not change the value of the property.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralGreat post! Pin
Priyanka Kale7-Mar-18 22:22
memberPriyanka Kale7-Mar-18 22:22 
GeneralMy vote of 4 Pin
sawant parag22-Mar-13 23:15
membersawant parag22-Mar-13 23:15 
GeneralMy vote of 3 Pin
Nicolas Dorier16-Feb-12 1:08
memberNicolas Dorier16-Feb-12 1:08 
Generalgood one Pin
pintoevita16-Aug-10 23:16
memberpintoevita16-Aug-10 23:16 
GeneralMy vote of 4 Pin
GPUToaster11-Aug-10 23:37
memberGPUToaster11-Aug-10 23:37 
GeneralMy vote of 5 Pin
Kim Togo11-Aug-10 0:56
memberKim Togo11-Aug-10 0:56 
GeneralMy vote of 5 Pin
seer_tenedos24-Aug-10 12:46
memberseer_tenedos24-Aug-10 12:46 
GeneralRe: My vote of 5 Pin
EdMan19610-May-11 9:52
memberEdMan19610-May-11 9:52 
GeneralExample code. Pin
jlafay4-Aug-10 5:43
memberjlafay4-Aug-10 5:43 
GeneralRe: Example code. Pin
Shakeel Iqbal4-Aug-10 6:04
memberShakeel Iqbal4-Aug-10 6:04 
GeneralRe: Example code. Pin
Richard Deeming16-Aug-10 8:55
memberRichard Deeming16-Aug-10 8:55 

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