Tuple<T1,T2,T3> Class

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

Tuple.cs

Represents a 3-tuple, or triple.

generic <typename T1, typename T2, typename T3>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable, System::Runtime::CompilerServices::ITuple

public class Tuple<T1,T2,T3> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable, System.Runtime.CompilerServices.ITuple

type Tuple<'T1, 'T2, 'T3> = class
    interface IStructuralComparable
    interface IStructuralEquatable
    interface IComparable
    interface ITuple

Public Class Tuple(Of T1, T2, T3)
Implements IComparable, IStructuralComparable, IStructuralEquatable, ITuple

Type Parameters

T1

The type of the tuple's first component.

T2

The type of the tuple's second component.

T3

The type of the tuple's third component.

Inheritance

Object

Tuple<T1,T2,T3>

Implements

IStructuralComparable IStructuralEquatable IComparable ITuple

Remarks

A tuple is a data structure that has a specific number and sequence of values. The Tuple<T1,T2,T3> class represents a 3-tuple, or triple, which is a tuple that has three components.

You can instantiate a Tuple<T1,T2,T3> object by calling either the Tuple<T1,T2,T3> constructor or the static Tuple.Create<T1,T2,T3>(T1, T2, T3) method. You can retrieve the values of the tuple's components by using the read-only Item1, Item2, and Item3 instance properties.

Tuples are commonly used in four different ways:

• To represent a single set of data. For example, a tuple can represent a database record, and its components can represent individual fields of the record.

• To provide easy access to, and manipulation of, a data set. The following example defines an array of Tuple<T1,T2,T3> objects that contain the names of students, their average test scores, and the number of tests taken. The array is passed to the ComputeStatistics method, which calculates the mean and standard deviation of the test scores.

  using System;
  
  public class Example
  {
     public static void Main()
     {
        Tuple<string, double, int>[] scores = 
                      { Tuple.Create("Jack", 78.8, 8),
                        Tuple.Create("Abbey", 92.1, 9), 
                        Tuple.Create("Dave", 88.3, 9),
                        Tuple.Create("Sam", 91.7, 8), 
                        Tuple.Create("Ed", 71.2, 5),
                        Tuple.Create("Penelope", 82.9, 8),
                        Tuple.Create("Linda", 99.0, 9),
                        Tuple.Create("Judith", 84.3, 9) };
        var result = ComputeStatistics(scores);
        Console.WriteLine("Mean score: {0:N2} (SD={1:N2}) (n={2})", 
                          result.Item2, result.Item3, result.Item1);
     }
  
     private static Tuple<int, double, double> ComputeStatistics(Tuple<string, double, int>[] scores) 
     {
        int n = 0;
        double sum = 0;
  
        // Compute the mean.
        foreach (var score in scores)
        {
           n += score.Item3;
           sum += score.Item2 * score.Item3;
        }
        double mean = sum / n;
        
        // Compute the standard deviation.
        double ss = 0;
        foreach (var score in scores)
        {
           ss = Math.Pow(score.Item2 - mean, 2);
        }
        double sd = Math.Sqrt(ss/scores.Length);
        return Tuple.Create(scores.Length, mean, sd);
     }
  }
  // The example displays the following output:
  //       Mean score: 87.02 (SD=0.96) (n=8)
  

  open System
  
  let computeStatistics (scores: Tuple<string, double, int>[]) = 
      let mutable n = 0
      let mutable sum = 0.
  
      // Compute the mean.
      for score in scores do
          n <- n + score.Item3
          sum <- sum + score.Item2 * double score.Item3
      let mean = sum / double n
      
      // Compute the standard deviation.
      let mutable ss = 0.
      for score in scores do
          ss <- (score.Item2 - mean) ** 2.
      let sd = sqrt (ss / double scores.Length)
      Tuple.Create(scores.Length, mean, sd)
  
  let scores = 
      [| Tuple.Create("Jack", 78.8, 8)
         Tuple.Create("Abbey", 92.1, 9) 
         Tuple.Create("Dave", 88.3, 9)
         Tuple.Create("Sam", 91.7, 8) 
         Tuple.Create("Ed", 71.2, 5)
         Tuple.Create("Penelope", 82.9, 8)
         Tuple.Create("Linda", 99.0, 9)
         Tuple.Create("Judith", 84.3, 9) |]
  let result = computeStatistics scores
  printfn $"Mean score: {result.Item2:N2} (SD={result.Item3:N2}) (n={result.Item1})"
  // The example displays the following output:
  //       Mean score: 87.02 (SD=0.96) (n=8)
  

  Module Example
     Public Sub Main()
        Dim scores() = 
                        { Tuple.Create("Jack", 78.8, 8),
                          Tuple.Create("Abbey", 92.1, 9), 
                          Tuple.Create("Dave", 88.3, 9),
                          Tuple.Create("Sam", 91.7, 8), 
                          Tuple.Create("Ed", 71.2, 5),
                          Tuple.Create("Penelope", 82.9, 8),
                          Tuple.Create("Linda", 99.0, 9),
                          Tuple.Create("Judith", 84.3, 9) }
        Dim result = ComputeStatistics(scores)
        Console.WriteLine("Mean score: {0:N2} (SD={1:N2}) (n={2})", 
                          result.Item2, result.Item3, result.Item1)
     End Sub
     
     Private Function ComputeStatistics(scores() As Tuple(Of String, Double, Integer)) _ 
                                  As Tuple(Of Integer, Double, Double)
        Dim n As Integer = 0      
        Dim sum As Double = 0
        
        ' Compute the mean.
        For Each score In scores
           n+= score.Item3 
           sum += score.Item2 * score.Item3
        Next     
        Dim mean As Double = sum / n
  
        ' Compute the standard deviation.
        Dim ss As Double = 0
        For Each score In scores
           ss = Math.Pow(score.Item2 - mean, 2)
        Next
        Dim sd As Double = Math.Sqrt(ss/scores.Length)
        Return Tuple.Create(scores.Length, mean, sd)
     End Function
  End Module
  ' The example displays the following output:
  '       Mean score: 87.02 (SD=0.96) (n=8)
  

• To return multiple values from a method without the use of out parameters (in C#) or ByRef parameters (in Visual Basic). For example, the previous example returns its summary test score statistics in a Tuple<T1,T2,T3> object.

• To pass multiple values to a method through a single parameter. For example, the Thread.Start(Object) method has a single parameter that lets you supply one value to the method that the thread executes at startup. If you supply a Tuple<T1,T2,T3> object as the method argument, you can supply the thread's startup routine with three items of data.

Constructors

Tuple<T1,T2,T3>(T1, T2, T3)

Initializes a new instance of the Tuple<T1,T2,T3> class.

Properties

Item1	Gets the value of the current Tuple<T1,T2,T3> object's first component.
Item2	Gets the value of the current Tuple<T1,T2,T3> object's second component.
Item3	Gets the value of the current Tuple<T1,T2,T3> object's third component.

Methods

Equals(Object)	Returns a value that indicates whether the current Tuple<T1,T2,T3> object is equal to a specified object.
GetHashCode()	Returns the hash code for the current Tuple<T1,T2,T3> object.
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the value of this Tuple<T1,T2,T3> instance.

Explicit Interface Implementations

IComparable.CompareTo(Object)	Compares the current Tuple<T1,T2,T3> object to a specified object and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.
IStructuralComparable.CompareTo(Object, IComparer)	Compares the current Tuple<T1,T2,T3> object to a specified object by using a specified comparer, and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.
IStructuralEquatable.Equals(Object, IEqualityComparer)	Returns a value that indicates whether the current Tuple<T1,T2,T3> object is equal to a specified object based on a specified comparison method.
IStructuralEquatable.GetHashCode(IEqualityComparer)	Calculates the hash code for the current Tuple<T1,T2,T3> object by using a specified computation method.
ITuple.Item[Int32]	Gets the value of the specified Tuple element.
ITuple.Length	Gets the number of elements in the Tuple.

Extension Methods

Deconstruct<T1,T2,T3>(Tuple<T1,T2,T3>, T1, T2, T3)	Deconstructs a tuple with 3 elements into separate variables.
ToValueTuple<T1,T2,T3>(Tuple<T1,T2,T3>)	Converts an instance of the Tuple class to an instance of the ValueTuple structure.

See also

• Tuple
• Tuple<T1>
• Tuple<T1,T2>
• Tuple<T1,T2,T3,T4>
• Tuple<T1,T2,T3,T4,T5>
• Tuple<T1,T2,T3,T4,T5,T6>
• Tuple<T1,T2,T3,T4,T5,T6,T7>
• Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>