Tuple<T1,T2,T3,T4> Class

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

Tuple.cs

Represents a 4-tuple, or quadruple.

generic <typename T1, typename T2, typename T3, typename T4>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable, System::Runtime::CompilerServices::ITuple

public class Tuple<T1,T2,T3,T4> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable, System.Runtime.CompilerServices.ITuple

type Tuple<'T1, 'T2, 'T3, 'T4> = class
    interface IStructuralComparable
    interface IStructuralEquatable
    interface IComparable
    interface ITuple

Public Class Tuple(Of T1, T2, T3, T4)
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.

T4

The type of the tuple's fourth component.

Inheritance

Object

Tuple<T1,T2,T3,T4>

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,T4> class represents a 4-tuple, or quadruple, which is a tuple that has four components.

You can instantiate a Tuple<T1,T2,T3,T4> object by calling either the Tuple<T1,T2,T3,T4> constructor or the static Tuple.Create<T1,T2,T3,T4>(T1, T2, T3, T4) method. You can retrieve the value of the tuple's components by using the read-only Item1, Item2, Item3, and Item4 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,T4> objects that contain the names of baseball pitchers, the number of innings they pitched, and the number of earned runs (runs that scored without fielding errors), and hits that they gave up. The array is passed to the ComputeStatistics method, which calculates each pitcher's earned run average (the average number of runs given up in a nine-inning game), and the average number of hits given up per inning. The method also uses these two averages to compute a hypothetical effectiveness average.

  using System;
  using System.Collections.Generic;
  
  public class Example
  {
     public static void Main()
     {
        Tuple<string, decimal, int, int>[] pitchers  =  
             { Tuple.Create("McHale, Joe", 240.1m, 221, 96),
               Tuple.Create("Paul, Dave", 233.1m, 231, 84), 
               Tuple.Create("Williams, Mike", 193.2m, 183, 86),
               Tuple.Create("Blair, Jack", 168.1m, 146, 65), 
               Tuple.Create("Henry, Walt", 140.1m, 96, 30),
               Tuple.Create("Lee, Adam", 137.2m, 109, 45),
               Tuple.Create("Rohr, Don", 101.0m, 110, 42) };
        Tuple<string, double, double, double>[] results= ComputeStatistics(pitchers);
  
        // Display the results.
        Console.WriteLine("{0,-20} {1,9} {2,11} {3,15}\n", 
                          "Pitcher", "ERA", "Hits/Inn.", "Effectiveness");
        foreach (var result in results)
           Console.WriteLine("{0,-20} {1,9:F2} {2,11:F2} {3,15:F2}",  
                          result.Item1, result.Item2, result.Item3, result.Item4);
     }
  
     private static Tuple<string, double, double, double>[] ComputeStatistics(Tuple<string, decimal, int, int>[] pitchers)
     {    
        var list = new List<Tuple<string, double, double, double>>();
        Tuple<string, double, double, double> result;
  
        foreach (var pitcher in pitchers)
        {
           // Decimal portion of innings pitched represents 1/3 of an inning
           double innings = (double) Math.Truncate(pitcher.Item2);
           innings = innings + (((double)pitcher.Item2 - innings) * .33);
           
           double ERA = pitcher.Item4/innings * 9;
           double hitsPerInning = pitcher.Item3/innings;
           double EI = (ERA * 2 + hitsPerInning * 9)/3;
           result = new Tuple<string, double, double, double>
                             (pitcher.Item1, ERA, hitsPerInning, EI);
           list.Add(result);
        }
        return list.ToArray();
     }
  }
  // The example displays the following output;
  //       Pitcher                    ERA   Hits/Inn.   Effectiveness
  //       
  //       McHale, Joe               3.60        0.92            5.16
  //       Paul, Dave                3.24        0.99            5.14
  //       Williams, Mike            4.01        0.95            5.52
  //       Blair, Jack               3.48        0.87            4.93
  //       Henry, Walt               1.93        0.69            3.34
  //       Lee, Adam                 2.95        0.80            4.36
  //       Rohr, Don                 3.74        1.09            5.76
  

  open System
  
  let computeStatistics (pitchers: Tuple<string, decimal, int, int>[]) =
      [| for pitcher in pitchers do
          // Decimal portion of innings pitched represents 1/3 of an inning
          let innings =  truncate (double pitcher.Item2) |> double
          let innings = innings + (double pitcher.Item2 - innings) * 0.33
          
          let ERA = double pitcher.Item4 / innings * 9.
          let hitsPerInning = double pitcher.Item3 / innings
          let EI = (ERA * 2. + hitsPerInning * 9.) / 3.
          Tuple<string, double, double, double>(pitcher.Item1, ERA, hitsPerInning, EI)|]
  
  let pitchers  =  
      [| Tuple.Create("McHale, Joe", 240.1m, 221, 96)
         Tuple.Create("Paul, Dave", 233.1m, 231, 84)
         Tuple.Create("Williams, Mike", 193.2m, 183, 86)
         Tuple.Create("Blair, Jack", 168.1m, 146, 65) 
         Tuple.Create("Henry, Walt", 140.1m, 96, 30)
         Tuple.Create("Lee, Adam", 137.2m, 109, 45)
         Tuple.Create("Rohr, Don", 101.0m, 110, 42) |]
  
  let results = computeStatistics pitchers
  
  // Display the results.
  printfn "%-20s %9s %11s %15s\n" "Pitcher" "ERA" "Hits/Inn." "Effectiveness"
  for result in results do
      printfn $"{result.Item1,-20} {result.Item2,9:F2} {result.Item3,11:F2} {result.Item4,15:F2}"
  
  // The example displays the following output
  //       Pitcher                    ERA   Hits/Inn.   Effectiveness
  //       
  //       McHale, Joe               3.60        0.92            5.16
  //       Paul, Dave                3.24        0.99            5.14
  //       Williams, Mike            4.01        0.95            5.52
  //       Blair, Jack               3.48        0.87            4.93
  //       Henry, Walt               1.93        0.69            3.34
  //       Lee, Adam                 2.95        0.80            4.36
  //       Rohr, Don                 3.74        1.09            5.76
  

  Imports System.Collections.Generic
  
  Module Example
     Public Sub Main()
        Dim pitchers() =  
                 { Tuple.Create("McHale, Joe", 240.1d, 221, 96),
                   Tuple.Create("Paul, Dave", 233.1d, 231, 84), 
                   Tuple.Create("Williams, Mike", 193.2d, 183, 86),
                   Tuple.Create("Blair, Jack", 168.1d, 146, 65), 
                   Tuple.Create("Henry, Walt", 140.1d, 96, 30),
                   Tuple.Create("Lee, Adam", 137.2d, 109, 45),
                   Tuple.Create("Rohr, Don", 101.0d, 110, 42) }
        Dim results() = ComputeStatistics(pitchers)
  
        ' Display the results.
        Console.WriteLine("{0,-20} {1,9} {2,11} {3,15}", "Pitcher", "ERA", "Hits/Inn.", "Effectiveness")
        Console.WriteLine()
        For Each result In results
           Console.WriteLine("{0,-20} {1,9:F2} {2,11:F2} {3,15:F2}",  
                          result.Item1, result.Item2, result.Item3, result.Item4)
        Next
     End Sub
     
     Private Function ComputeStatistics(pitchers() As Tuple(Of String, Decimal, Integer, Integer)) _ 
                                  As Tuple(Of String, Double, Double, Double)()
        Dim list As New List(Of Tuple(Of String, Double, Double, Double))
        Dim result As Tuple(Of String, Double, Double, Double)
  
        For Each pitcher As Tuple(Of String, Decimal, Integer, Integer) In pitchers
           ' Decimal portion of innings pitched represents 1/3 of an inning
           Dim innings As Double = CDbl(Math.Truncate(pitcher.Item2))
           innings = innings + ((pitcher.Item2 - innings) * .33)
           
           Dim ERA As Double = pitcher.Item4/innings * 9
           Dim hitsPerInning As Double = pitcher.Item3/innings
           Dim EI As Double = (ERA * 2 + hitsPerInning * 9)/3
           result = New Tuple(Of String, Double, Double, Double) _
                             (pitcher.Item1, ERA, hitsPerInning, EI)
           list.Add(result) 
        Next
        Return list.ToArray()
     End Function
  End Module
  ' The example displays the following output:
  '       Pitcher                    ERA   Hits/Inn.   Effectiveness
  '       
  '       McHale, Joe               3.60        0.92            5.16
  '       Paul, Dave                3.24        0.99            5.14
  '       Williams, Mike            4.01        0.95            5.52
  '       Blair, Jack               3.48        0.87            4.93
  '       Henry, Walt               1.93        0.69            3.34
  '       Lee, Adam                 2.95        0.80            4.36
  '       Rohr, Don                 3.74        1.09            5.76
  

• 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 computed statistics, along with the name of the pitcher, in an array of Tuple<T1,T2,T3,T4> objects.

• 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,T4> object as the method argument, you can supply the thread's startup routine with four items of data.

Constructors

Tuple<T1,T2,T3,T4>(T1, T2, T3, T4)

Initializes a new instance of the Tuple<T1,T2,T3,T4> class.

Properties

Item1	Gets the value of the current Tuple<T1,T2,T3,T4> object's first component.
Item2	Gets the value of the current Tuple<T1,T2,T3,T4> object's second component.
Item3	Gets the value of the current Tuple<T1,T2,T3,T4> object's third component.
Item4	Gets the value of the current Tuple<T1,T2,T3,T4> object's fourth component.

Methods

Equals(Object)	Returns a value that indicates whether the current Tuple<T1,T2,T3,T4> object is equal to a specified object.
GetHashCode()	Returns the hash code for the current Tuple<T1,T2,T3,T4> 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,T4> instance.

Explicit Interface Implementations

IComparable.CompareTo(Object)	Compares the current Tuple<T1,T2,T3,T4> 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,T4> 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,T4> 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,T4> 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,T4>(Tuple<T1,T2,T3,T4>, T1, T2, T3, T4)	Deconstructs a tuple with 4 elements into separate variables.
ToValueTuple<T1,T2,T3,T4>(Tuple<T1,T2,T3,T4>)	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>
• 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>