Статья
11/18/2011

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

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

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

Syntax

'Declaration
Public ReadOnly Property Item4 As T4

public T4 Item4 { get; }

Property Value

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

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, T4> object, and retrieving the second element from the array that is returned by its Type.GetGenericArguments method.

Examples

The following example defines an array of Tuple<T1, T2, T3, T4, T5> objects whose components contain the name of a state in the United States, its population in 1990 and 2000, its population change in this 10-year period, and the percentage change in its population. It then iterates through the array and displays the value of each component in a tuple.

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.FontFamily = New System.Windows.Media.FontFamily("Courier New")

      ' Define array of tuples reflecting population change by state, 1990-2000.
      Dim statesData() = _
          { Tuple.Create("California", 29760021, 33871648, 4111627, 13.8), _ 
            Tuple.Create("Illinois", 11430602, 12419293, 988691, 8.6), _
            Tuple.Create("Washington", 4866692, 5894121, 1027429, 21.1) }
      ' Display the items of each tuple
      outputBlock.Text += String.Format("{0,-12}{1,18}{2,18}{3,15}{4,12}", "State", "Population 1990", _
                        "Population 2000", "Change", "% Change") & vbCrLf
      outputBlock.Text &= vbCrLf
      For Each stateData As Tuple(Of String, Integer, Integer, Integer, Double) In statesData
         outputBlock.Text += String.Format("{0,-12}{1,18:N0}{2,18:N0}{3,15:N0}{4,12:P1}", _
                           stateData.Item1, stateData.Item2, _
                           stateData.Item3, stateData.Item4, stateData.Item5 / 100) & vbCrLf
      Next
   End Sub
End Module
' The example displays the following output:
'    State          Population 1990   Population 2000         Change    % Change
'    
'    California          29,760,021        33,871,648      4,111,627      13.8 %
'    Illinois            11,430,602        12,419,293        988,691       8.6 %
'    Washington           4,866,692         5,894,121      1,027,429      21.1 %

using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      outputBlock.FontFamily = new System.Windows.Media.FontFamily("Courier New");

      // Define array of tuples reflecting population change by state, 1990-2000.
      Tuple<string, int, int, int, double>[] statesData = 
         { Tuple.Create("California", 29760021, 33871648, 4111627, 13.8), 
           Tuple.Create("Illinois", 11430602, 12419293, 988691, 8.6), 
           Tuple.Create("Washington", 4866692, 5894121, 1027429, 21.1) };

      // Display the items of each tuple
      outputBlock.Text += String.Format("{0,-12}{1,18}{2,18}{3,15}{4,12}\n", "State",
                        "Population 1990", "Population 2000", "Change",
                        "% Change") + "\n";
      foreach (Tuple<string, int, int, int, double> stateData in statesData)
         outputBlock.Text += String.Format("{0,-12}{1,18:N0}{2,18:N0}{3,15:N0}{4,12:P1}",
                           stateData.Item1, stateData.Item2,
                           stateData.Item3, stateData.Item4, stateData.Item5 / 100) + "\n";
   }
}
// The example displays the following output:
//    State          Population 1990   Population 2000         Change    % Change
//    
//    California          29,760,021        33,871,648      4,111,627      13.8 %
//    Illinois            11,430,602        12,419,293        988,691       8.6 %
//    Washington           4,866,692         5,894,121      1,027,429      21.1 %

Version Information

Silverlight

Supported in: 5, 4

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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