Статья
11/18/2011

Tuple<T1, T2, T3, T4, T5, T6, T7>.Item1 Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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

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

Syntax

'Declaration
Public ReadOnly Property Item1 As T1

public T1 Item1 { get; }

Property Value

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

Remarks

You can dynamically determine the type of the Item1 component in one of two ways:

By calling the GetType method on the value that is returned by the Item1 property.
By retrieving the Type object that represents the Tuple<T1, T2, T3, T4, T5, T6, T7> object, and retrieving the first 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, T6, T7> objects whose components contain population data for three U.S. cities (New York, Chicago, and Los Angeles) from 1950 through 2000. It then displays a table that lists the data. To display the city name, it retrieves the value of the Item1 property for each Tuple<T1, T2, T3, T4, T5, T6, T7> object.

Imports System.Windows.Media

Module Example
   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      outputBlock.FontFamily = new FontFamily("Courier New")
      ' Create tuples containing population data for New York, Chicago, 
      ' and Los Angeles, 1960-2000.
      Dim cities() = _
           { Tuple.Create("New York", 7891957, 7781984, 7894862, _ 
                          7071639, 7322564, 8008278), _
             Tuple.Create("Los Angeles", 1970358, 2479015, 2816061, _ 
                          2966850, 3485398, 3694820), _
             Tuple.Create("Chicago", 3620962, 3550904, 3366957, _ 
                          3005072, 2783726, 2896016) } 

      ' Display tuple data in table.
      Dim header As String = "Population in"
      outputBlock.Text += String.Format("{0,-12} {1,66}", _  
                        "City", New String("-"c,(66-header.Length)\2) + header + _
                                New String("-"c, (66-header.Length)\2)) & vbCrLf
      outputBlock.Text += String.Format("{0,24}{1,11}{2,11}{3,11}{4,11}{5,11}", _ 
                        "1950", "1960", "1970", "1980", "1990", "2000") & vbCrLf                  
      outputBlock.Text &= vbCrLf
      For Each city In cities
         outputBlock.Text += String.Format("{0,-12} {1,11:N0}{2,11:N0}{3,11:N0}{4,11:N0}{5,11:N0}{6,11:N0}", _
                           city.Item1, city.Item2, city.Item3, city.Item4, _
                           city.Item5, city.Item6, city.Item7) + vbCrLf
      Next
   End Sub
End Module
' The example displays the following output:
'    City          --------------------------Population in--------------------------
'                        1950       1960       1970       1980       1990       2000
'    
'    New York       7,891,957  7,781,984  7,894,862  7,071,639  7,322,564  8,008,278
'    Los Angeles    1,970,358  2,479,015  2,816,061  2,966,850  3,485,398  3,694,820
'    Chicago        3,620,962  3,550,904  3,366,957  3,005,072  2,783,726  2,896,016

using System;
using System.Text.RegularExpressions;
using System.Windows.Media;

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

      // Create tuples containing population data for New York, Chicago, 
      // and Los Angeles, 1960-2000.
      Tuple<string, int, int, int, int, int, int>[] cities =
           { Tuple.Create("New York", 7891957, 7781984, 7894862, 7071639, 7322564, 8008278),
             Tuple.Create("Los Angeles", 1970358, 2479015, 2816061, 2966850, 3485398, 3694820),
             Tuple.Create("Chicago", 3620962, 3550904, 3366957, 3005072, 2783726, 2896016) };

      // Display tuple data in table.
      string header = "Population in";
      outputBlock.Text += String.Format("{0,-12} {1,66}",
                        "City", new String('-', (66 - header.Length) / 2) + header +
                                new String('-', (66 - header.Length) / 2)) + "\n";
      outputBlock.Text += String.Format("{0,24}{1,11}{2,11}{3,11}{4,11}{5,11}\n",
                        "1950", "1960", "1970", "1980", "1990", "2000") + "\n";

      foreach (var city in cities)
         outputBlock.Text += String.Format("{0,-12} {1,11:N0}{2,11:N0}{3,11:N0}{4,11:N0}{5,11:N0}{6,11:N0}",
                           city.Item1, city.Item2, city.Item3, city.Item4,
                           city.Item5, city.Item6, city.Item7) + "\n";
   }
}
// The example displays the following output:
//    City          --------------------------Population in--------------------------
//                        1950       1960       1970       1980       1990       2000
//    
//    New York       7,891,957  7,781,984  7,894,862  7,071,639  7,322,564  7,322,564
//    Los Angeles    1,970,358  2,479,015  2,816,061  2,966,850  3,485,398  3,485,398
//    Chicago        3,620,962  3,550,904  3,366,957  3,005,072  2,783,726  2,783,726

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.

Поделиться через