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Tuple<T1, T2, T3>.Item2 Property

Gets the value of the current Tuple<T1, T2, T3> object's second component.

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

public T2 Item2 { get; }

Property Value

Type: T2
The value of the current Tuple<T1, T2, T3> object's second component.

You can dynamically determine the type of the Item2 component in one of two ways:

  • By calling the GetType method on the value that is returned by the Item2 property.

  • By retrieving the Type object that represents the Tuple<T1, T2, T3> object, and retrieving the second element from the array that is returned by its Type.GetGenericArguments method.

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 score, standard deviation, and number of cases from which the statistics are calculated. These values are stored in the Tuple<T1, T2, T3> object that is returned by the ComputeStatistics method. The Item2 property contains the mean test score.

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)

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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