Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>.Item7 属性
定义
获取当前 Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> 对象的第七个分量的值。Gets the value of the current Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> object's seventh component.
public:
property T7 Item7 { T7 get(); };
public T7 Item7 { get; }
member this.Item7 : 'T7
Public ReadOnly Property Item7 As T7
属性值
- T7
当前 Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> 对象的第七个分量的值。The value of the current Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> object's seventh component.
示例
下面的示例创建一个17元组对象,该对象包含从1860到2000的 Detroit 的城市人口数据。The following example creates a 17-tuple object that contains population data for the city of Detroit, Michigan, from 1860 to 2000. 17元组的第七个分量是1900的人口。The seventh component of the 17-tuple is the population in 1900. 该示例使用 Item7 属性来显示总体值,并计算1900与1910之间人口变动的年率。The example uses the Item7 property to display the population value and to calculate the annual rate of population change between 1900 and 1910.
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 %
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 %
注解
可以 Item7 通过以下两种方式之一动态确定组件的类型:You can dynamically determine the type of the Item7 component in one of two ways:
通过
GetType对属性返回的值调用方法 Item7 。By calling theGetTypemethod on the value that is returned by the Item7 property.通过检索 Type 表示对象的对象 Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> ,并从其方法返回的数组中检索第七个元素 Type.GetGenericArguments 。By retrieving the Type object that represents the Tuple<T1,T2,T3,T4,T5,T6,T7,TRest> object, and retrieving the seventh element from the array that is returned by its Type.GetGenericArguments method.