Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>.Rest Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan komponen objek saat ini Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> yang tersisa.
public:
property TRest Rest { TRest get(); };public TRest Rest { get; }member this.Rest : 'RestPublic ReadOnly Property Rest As TRestNilai Properti
TRest
Nilai komponen objek saat ini Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> yang tersisa.
Contoh
Contoh berikut membuat objek 17 tuple yang berisi data populasi untuk kota Detroit, Michigan, dari 1860 hingga 2000. Komponen ketujuh dari 17 tuple adalah populasi pada tahun 1900. Contoh menggunakan Rest properti untuk mengambil nilai komponen kedelapan belas hingga keempat belas Rest , dan menggunakan properti objek berlapis Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> untuk mengambil nilai komponen yang tersisa.
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 %
let showPopulation year newPopulation =
printfn $"""{year,5} {newPopulation,14:N0} {"n/a",10:P2}"""
let showPopulationChange year newPopulation oldPopulation =
printfn $"{year,5} {newPopulation,14:N0} {(double (newPopulation - oldPopulation) / oldPopulation) / 10.,10:P2}"
let from1980 = Tuple.Create(1203339, 1027974, 951270)
let from1910 = new Tuple<int, int, int, int, int, int, int, Tuple<int, int, int>>(465766, 993078, 1568622, 1623452, 1849568, 1670144, 1511462, from1980)
let 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)
printfn $"Population of {population.Item1}\n"
printfn "%5s %14s %10s" "Year" "Population" "Change"
do
let year = population.Item2
showPopulation year population.Item3
let year = year + 10
showPopulationChange year population.Item4 population.Item3
let year = year + 10
showPopulationChange year population.Item5 population.Item4
let year = year + 10
showPopulationChange year population.Item6 population.Item5
let year = year + 10
showPopulationChange year population.Item7 population.Item6
let year = year + 10
showPopulationChange year population.Rest.Item1 population.Item7
let year = year + 10
showPopulationChange year population.Rest.Item2 population.Rest.Item1
let year = year + 10
showPopulationChange year population.Rest.Item3 population.Rest.Item2
let year = year + 10
showPopulationChange year population.Rest.Item4 population.Rest.Item3
let year = year + 10
showPopulationChange year population.Rest.Item5 population.Rest.Item4
let year = year + 10
showPopulationChange year population.Rest.Item6 population.Rest.Item5
let year = year + 10
showPopulationChange year population.Rest.Item7 population.Rest.Item6
let year = year + 10
showPopulationChange year population.Rest.Rest.Item1 population.Rest.Item7
let year = year + 10
showPopulationChange year population.Rest.Rest.Item2 population.Rest.Rest.Item1
let year = year + 10
showPopulationChange year population.Rest.Rest.Item3 population.Rest.Rest.Item2
// 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 %
Module Example
Sub Main()
Dim from1980 As Tuple(Of Integer, Integer, Integer) =
Tuple.Create(1203339, 1027974, 951270)
Dim from1910 As New Tuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, _
Tuple(Of Integer, Integer, Integer)) _
(465766, 993078, 1568622, 1623452, 1849568, 1670144, 1511462, from1980)
Dim population As New Tuple(Of String, Integer, Integer, Integer, Integer, Integer, Integer, _
Tuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, Tuple(Of Integer, Integer, Integer))) _
("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")
Dim year As Integer = 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)
End Sub
Private Sub ShowPopulationChange(ByVal year As Integer, ByVal newPopulation As Integer, ByVal oldPopulation As Integer)
Console.WriteLine("{0,5} {1,14:N0} {2,10:P2}", year, newPopulation,
(newPopulation - oldPopulation) / oldPopulation / 10)
End Sub
Private Sub ShowPopulation(ByVal year As Integer, ByVal newPopulation As Integer)
Console.WriteLine("{0,5} {1,14:N0} {2,10:P2}", year, newPopulation, "n/a")
End Sub
End Module
' 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 %
Keterangan
Properti Rest mengembalikan objek berlapis Tuple yang memungkinkan akses ke kedelapan meskipun komponen nth tuple. Tergantung pada jumlah total komponen dalam tuple, nilai komponen kedelapan belas hingga keempat belas dapat diambil dari objek Item1 berlapis Tuple melalui Item7 properti. Anda kemudian dapat menggunakan Rest properti objek berlapis Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> untuk mengambil Tuple objek pada tingkat berlapis berikutnya.
Anda dapat secara dinamis menentukan jumlah komponen dalam objek berlapis Tuple yang dikembalikan oleh properti dengan Rest mengekstrak digit dari nama jenisnya. Contoh berikut memberikan ilustrasi.
Imports System.Reflection
Module Example
Sub Main()
Dim from1980 As Tuple(Of Integer, Integer, Integer) =
Tuple.Create(1203339, 1027974, 951270)
Dim from1910 As New Tuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, _
Tuple(Of Integer, Integer, Integer)) _
(465766, 993078, 1568622, 1623452, 1849568, 1670144, 1511462, from1980)
Dim population As New Tuple(Of String, Integer, Integer, Integer, Integer, Integer, Integer, _
Tuple(Of Integer, Integer, Integer, Integer, Integer, Integer, Integer, Tuple(Of Integer, Integer, Integer))) _
("Detroit", 1860, 45619, 79577, 116340, 205876, 285704, from1910)
ShowComponentCount(population)
End Sub
Private Sub ShowComponentCount(tuple As Object)
Static ctr As Integer = 0
Static totalComponents As Integer = 0
Dim components As Integer = 0
ctr += 1
Dim name As String = tuple.GetType().Name
components += Int32.Parse(name.Substring(name.IndexOf("`") + 1))
If components = 8 Then
totalComponents += 7
Console.WriteLine("The tuple at level {0} has 7 components.", ctr)
ShowComponentCount(tuple.Rest)
Else
totalComponents += components
Console.WriteLine("The tuple at level {0} has {1} components.",
ctr, components)
Console.WriteLine("Total components in tuple: {0}", totalComponents)
End If
End Sub
End Module
' The example displays the following output:
' The tuple at level 1 has 7 components.
' The tuple at level 2 has 7 components.
' The tuple at level 3 has 3 components.
' Total components in tuple: 17
