Tuple<T1,T2,T3>.Item2Tuple<T1,T2,T3>.Item2Tuple<T1,T2,T3>.Item2Tuple<T1,T2,T3>.Item2 Property

Definition

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

public:
property T2 Item2 { T2 get(); };
public T2 Item2 { get; }
member this.Item2 : 'T2
Public ReadOnly Property Item2 As T2

Property Value

T2 T2 T2 T2

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

Examples

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)
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)

Remarks

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.