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Tuple<T1, T2, T3, T4, T5, T6, T7, TRest>.Item4 Property

Gets the value of the current Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object's fourth component.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public T4 Item4 { get; }

Property Value

Type: T4
The value of the current Tuple<T1, T2, T3, T4, T5, T6, T7, TRest> object's fourth component.

You can dynamically determine the type of the Item4 component in one of two ways:

The following example creates a 17-tuple object that contains population data for the city of Detroit, Michigan, from 1860 to 2000. The fourth component of the 17-tuple is the population in 1870. The example uses the Item4 property to display the population value and to calculate the annual rate of population change between 1870 and 1880.

using System;

class Example
{
    static void Main(string[] args)
    {
        Tuple<int, int, int> from1980 = Tuple.Create(1203339, 1027974, 951270);
        var from1910 = new Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>> 
            (465766, 993078, 1568622, 1623452, 1849568, 1670144, 1511462, from1980);
        var population = new Tuple<string, int, int, int, int, int, int,
            Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>>> 
            ("Detroit", 1860, 45619, 79577, 116340, 205876, 285704, from1910);

        Console.WriteLine("Population of {0}", population.Item1);
        Console.WriteLine();
        Console.WriteLine("{0,5}  {1,14}  {2,10}", "Year", "Population", "Change");

        int year = population.Item2;
        ShowPopulation(year, population.Item3);
        year += 10;
        ShowPopulationChange(year, population.Item4, population.Item3);
        year += 10;
        ShowPopulationChange(year, population.Item5, population.Item4);
        year += 10;
        ShowPopulationChange(year, population.Item6, population.Item5);
        year += 10;
        ShowPopulationChange(year, population.Item7, population.Item6);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item1, population.Item7);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item2, population.Rest.Item1);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item3, population.Rest.Item2);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item4, population.Rest.Item3);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item5, population.Rest.Item4);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item6, population.Rest.Item5);
        year += 10;
        ShowPopulationChange(year, population.Rest.Item7, population.Rest.Item6);
        year += 10;
        ShowPopulationChange(year, population.Rest.Rest.Item1, population.Rest.Item7);
        year += 10;
        ShowPopulationChange(year, population.Rest.Rest.Item2, population.Rest.Rest.Item1);
        year += 10;
        ShowPopulationChange(year, population.Rest.Rest.Item3, population.Rest.Rest.Item2);
    }

    private static void ShowPopulationChange(int year, int newPopulation, int oldPopulation)
    {
        Console.WriteLine("{0,5}  {1,14:N0}  {2,10:P2}", year, newPopulation,
                          ((double)(newPopulation - oldPopulation) / oldPopulation) / 10);
    }

    private static void ShowPopulation(int year, int newPopulation)
    {
        Console.WriteLine("{0,5}  {1,14:N0}  {2,10:P2}", year, newPopulation, "n/a");
    }
}
// The example displays the following output: 
// 
//    Population of Detroit 
//    Year      Population      Change 
//    1860          45,619         n/a 
//    1870          79,577      7.44 % 
//    1880         116,340      4.62 % 
//    1890         205,876      7.70 % 
//    1900         285,704      3.88 % 
//    1910         465,766      6.30 % 
//    1920         993,078     11.32 % 
//    1930       1,568,622      5.80 % 
//    1940       1,623,452      0.35 % 
//    1950       1,849,568      1.39 % 
//    1960       1,670,144     -0.97 % 
//    1970       1,511,462     -0.95 % 
//    1980       1,203,339     -2.04 % 
//    1990       1,027,974     -1.46 % 
//    2000         951,270     -0.75 %

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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