Tuple<T1,T2,T3,T4> 类

定义

表示 4 元组,即四元组。Represents a 4-tuple, or quadruple.

generic <typename T1, typename T2, typename T3, typename T4>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable
[System.Serializable]
public class Tuple<T1,T2,T3,T4> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable
type Tuple<'T1, 'T2, 'T3, 'T4> = class
    interface IStructuralEquatable
    interface IStructuralComparable
    interface IComparable
Public Class Tuple(Of T1, T2, T3, T4)
Implements IComparable, IStructuralComparable, IStructuralEquatable

类型参数

T1

此元组的第一个组件的类型。The type of the tuple's first component.

T2

此元组的第二个组件的类型。The type of the tuple's second component.

T3

此元组的第三个组件的类型。The type of the tuple's third component.

T4

此元组的第四个组件的类型。The type of the tuple's fourth component.

继承
Tuple<T1,T2,T3,T4>
属性
实现

注解

元组是具有特定数量和值序列的数据结构。A tuple is a data structure that has a specific number and sequence of values. Tuple<T1,T2,T3,T4>类表示4元组, 或四元组, 它是具有四个组件的元组。The Tuple<T1,T2,T3,T4> class represents a 4-tuple, or quadruple, which is a tuple that has four components.

可以通过调用Tuple<T1,T2,T3,T4>构造Tuple<T1,T2,T3,T4>函数或静态Tuple.Create<T1,T2,T3,T4>(T1, T2, T3, T4)方法来实例化对象。You can instantiate a Tuple<T1,T2,T3,T4> object by calling either the Tuple<T1,T2,T3,T4> constructor or the static Tuple.Create<T1,T2,T3,T4>(T1, T2, T3, T4) method. 您可以使用Item1只读、 Item2Item3Item4实例属性检索元组组件的值。You can retrieve the value of the tuple's components by using the read-only Item1, Item2, Item3, and Item4 instance properties.

元组通常以四种不同的方式使用:Tuples are commonly used in four different ways:

  • 表示单个数据集。To represent a single set of data. 例如, 元组可以表示数据库记录, 并且其组件可以表示记录的各个字段。For example, a tuple can represent a database record, and its components can represent individual fields of the record.

  • 提供对数据集的轻松访问和操作。To provide easy access to, and manipulation of, a data set. 下面的示例定义了一个Tuple<T1,T2,T3,T4>对象数组, 这些对象包含棒球 pitchers 的名称、其发出的节的数量, 以及所获得的运行 (未使用 "错误" 的评分) 以及它们所放弃的命中数。The following example defines an array of Tuple<T1,T2,T3,T4> objects that contain the names of baseball pitchers, the number of innings they pitched, and the number of earned runs (runs that scored without fielding errors), and hits that they gave up. 该数组将传递给ComputeStatistics方法, 该方法计算每个罐状指针的获得的平均运行平均值 (在 inning 的游戏中给出的平均运行数) 以及每个 inning 指定的平均命中次数。The array is passed to the ComputeStatistics method, which calculates each pitcher's earned run average (the average number of runs given up in a nine-inning game), and the average number of hits given up per inning. 方法还使用这两个平均值来计算假设的有效性平均值。The method also uses these two averages to compute a hypothetical effectiveness average.

    using System;
    using System.Collections.Generic;
    
    public class Example
    {
       public static void Main()
       {
          Tuple<string, decimal, int, int>[] pitchers  =  
               { Tuple.Create("McHale, Joe", 240.1m, 221, 96),
                 Tuple.Create("Paul, Dave", 233.1m, 231, 84), 
                 Tuple.Create("Williams, Mike", 193.2m, 183, 86),
                 Tuple.Create("Blair, Jack", 168.1m, 146, 65), 
                 Tuple.Create("Henry, Walt", 140.1m, 96, 30),
                 Tuple.Create("Lee, Adam", 137.2m, 109, 45),
                 Tuple.Create("Rohr, Don", 101.0m, 110, 42) };
          Tuple<string, double, double, double>[] results= ComputeStatistics(pitchers);
    
          // Display the results.
          Console.WriteLine("{0,-20} {1,9} {2,11} {3,15}\n", 
                            "Pitcher", "ERA", "Hits/Inn.", "Effectiveness");
          foreach (var result in results)
             Console.WriteLine("{0,-20} {1,9:F2} {2,11:F2} {3,15:F2}",  
                            result.Item1, result.Item2, result.Item3, result.Item4);
       }
    
       private static Tuple<string, double, double, double>[] ComputeStatistics(Tuple<string, decimal, int, int>[] pitchers)
       {    
          var list = new List<Tuple<string, double, double, double>>();
          Tuple<string, double, double, double> result;
    
          foreach (var pitcher in pitchers)
          {
             // Decimal portion of innings pitched represents 1/3 of an inning
             double innings = (double) Math.Truncate(pitcher.Item2);
             innings = innings + (((double)pitcher.Item2 - innings) * .33);
             
             double ERA = pitcher.Item4/innings * 9;
             double hitsPerInning = pitcher.Item3/innings;
             double EI = (ERA * 2 + hitsPerInning * 9)/3;
             result = new Tuple<string, double, double, double>
                               (pitcher.Item1, ERA, hitsPerInning, EI);
             list.Add(result);
          }
          return list.ToArray();
       }
    }
    // The example displays the following output;
    //       Pitcher                    ERA   Hits/Inn.   Effectiveness
    //       
    //       McHale, Joe               3.60        0.92            5.16
    //       Paul, Dave                3.24        0.99            5.14
    //       Williams, Mike            4.01        0.95            5.52
    //       Blair, Jack               3.48        0.87            4.93
    //       Henry, Walt               1.93        0.69            3.34
    //       Lee, Adam                 2.95        0.80            4.36
    //       Rohr, Don                 3.74        1.09            5.76
    
    Imports System.Collections.Generic
    
    Module Example
       Public Sub Main()
          Dim pitchers() =  
                   { Tuple.Create("McHale, Joe", 240.1d, 221, 96),
                     Tuple.Create("Paul, Dave", 233.1d, 231, 84), 
                     Tuple.Create("Williams, Mike", 193.2d, 183, 86),
                     Tuple.Create("Blair, Jack", 168.1d, 146, 65), 
                     Tuple.Create("Henry, Walt", 140.1d, 96, 30),
                     Tuple.Create("Lee, Adam", 137.2d, 109, 45),
                     Tuple.Create("Rohr, Don", 101.0d, 110, 42) }
          Dim results() = ComputeStatistics(pitchers)
    
          ' Display the results.
          Console.WriteLine("{0,-20} {1,9} {2,11} {3,15}", "Pitcher", "ERA", "Hits/Inn.", "Effectiveness")
          Console.WriteLine()
          For Each result In results
             Console.WriteLine("{0,-20} {1,9:F2} {2,11:F2} {3,15:F2}",  
                            result.Item1, result.Item2, result.Item3, result.Item4)
          Next
       End Sub
       
       Private Function ComputeStatistics(pitchers() As Tuple(Of String, Decimal, Integer, Integer)) _ 
                                    As Tuple(Of String, Double, Double, Double)()
          Dim list As New List(Of Tuple(Of String, Double, Double, Double))
          Dim result As Tuple(Of String, Double, Double, Double)
    
          For Each pitcher As Tuple(Of String, Decimal, Integer, Integer) In pitchers
             ' Decimal portion of innings pitched represents 1/3 of an inning
             Dim innings As Double = CDbl(Math.Truncate(pitcher.Item2))
             innings = innings + ((pitcher.Item2 - innings) * .33)
             
             Dim ERA As Double = pitcher.Item4/innings * 9
             Dim hitsPerInning As Double = pitcher.Item3/innings
             Dim EI As Double = (ERA * 2 + hitsPerInning * 9)/3
             result = New Tuple(Of String, Double, Double, Double) _
                               (pitcher.Item1, ERA, hitsPerInning, EI)
             list.Add(result) 
          Next
          Return list.ToArray()
       End Function
    End Module
    ' The example displays the following output:
    '       Pitcher                    ERA   Hits/Inn.   Effectiveness
    '       
    '       McHale, Joe               3.60        0.92            5.16
    '       Paul, Dave                3.24        0.99            5.14
    '       Williams, Mike            4.01        0.95            5.52
    '       Blair, Jack               3.48        0.87            4.93
    '       Henry, Walt               1.93        0.69            3.34
    '       Lee, Adam                 2.95        0.80            4.36
    '       Rohr, Don                 3.74        1.09            5.76
    
  • 从方法返回多个值, 而不使用out参数 (在中C#) 或ByRef参数 (在 Visual Basic 中)。To return multiple values from a method without the use of out parameters (in C#) or ByRef parameters (in Visual Basic). 例如, 上一个示例在Tuple<T1,T2,T3,T4>对象数组中返回其计算统计信息, 以及指针的名称。For example, the previous example returns its computed statistics, along with the name of the pitcher, in an array of Tuple<T1,T2,T3,T4> objects.

  • 若要通过单个参数向方法传递多个值, 则为。To pass multiple values to a method through a single parameter. 例如, 该Thread.Start(Object)方法只有一个参数, 该参数使你可以为启动时线程执行的方法提供一个值。For example, the Thread.Start(Object) method has a single parameter that lets you supply one value to the method that the thread executes at startup. 如果提供Tuple<T1,T2,T3,T4>对象作为方法参数, 则可以提供具有四个数据项的线程启动例程。If you supply a Tuple<T1,T2,T3,T4> object as the method argument, you can supply the thread's startup routine with four items of data.

构造函数

Tuple<T1,T2,T3,T4>(T1, T2, T3, T4)

初始化 Tuple<T1,T2,T3,T4> 类的新实例。Initializes a new instance of the Tuple<T1,T2,T3,T4> class.

属性

Item1

获取当前 Tuple<T1,T2,T3,T4> 对象的第一个分量的值。Gets the value of the current Tuple<T1,T2,T3,T4> object's first component.

Item2

获取当前 Tuple<T1,T2,T3,T4> 对象的第二个分量的值。Gets the value of the current Tuple<T1,T2,T3,T4> object's second component.

Item3

获取当前 Tuple<T1,T2,T3,T4> 对象的第三个分量的值。Gets the value of the current Tuple<T1,T2,T3,T4> object's third component.

Item4

获取当前 Tuple<T1,T2,T3,T4> 对象的第四个分量的值。Gets the value of the current Tuple<T1,T2,T3,T4> object's fourth component.

方法

Equals(Object)

返回一个值,该值指示当前的 Tuple<T1,T2,T3,T4> 对象是否与指定对象相等。Returns a value that indicates whether the current Tuple<T1,T2,T3,T4> object is equal to a specified object.

GetHashCode()

返回当前 Tuple<T1,T2,T3,T4> 对象的哈希代码。Returns the hash code for the current Tuple<T1,T2,T3,T4> object.

GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回表示此 Tuple<T1,T2,T3,T4> 实例的值的字符串。Returns a string that represents the value of this Tuple<T1,T2,T3,T4> instance.

显式界面实现

IComparable.CompareTo(Object)

比较当前 Tuple<T1,T2,T3,T4> 对象与指定对象,并返回一个整数,该整数指示当前对象在排序顺序中的位置:是在指定对象之前、之后还是在与指定对象相同的位置。Compares the current Tuple<T1,T2,T3,T4> object to a specified object and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.

IStructuralComparable.CompareTo(Object, IComparer)

使用指定的比较器将当前的 Tuple<T1,T2,T3,T4> 对象与指定对象进行比较,并返回一个整数,该整数指示当前对象在排序顺序中的位置是在指定对象之前、之后还是与其相同。Compares the current Tuple<T1,T2,T3,T4> object to a specified object by using a specified comparer and returns an integer that indicates whether the current object is before, after, or in the same position as the specified object in the sort order.

IStructuralEquatable.Equals(Object, IEqualityComparer)

返回一个值,该值根据指定的比较方法指示当前的 Tuple<T1,T2,T3,T4> 对象是否与指定对象相等。Returns a value that indicates whether the current Tuple<T1,T2,T3,T4> object is equal to a specified object based on a specified comparison method.

IStructuralEquatable.GetHashCode(IEqualityComparer)

使用指定的计算方法计算当前 Tuple<T1,T2,T3,T4> 对象的哈希代码。Calculates the hash code for the current Tuple<T1,T2,T3,T4> object by using a specified computation method.

ITuple.Item[Int32]

获取指定 Tuple 元素的值。Gets the value of the specified Tuple element.

ITuple.Length

获取 Tuple 中的元素数。Gets the number of elements in the Tuple.

扩展方法

Deconstruct<T1,T2,T3,T4>(Tuple<T1,T2,T3,T4>, T1, T2, T3, T4)

将具有 4 个元素的元组解构为不同的变量。Deconstructs a tuple with 4 elements into separate variables.

ToValueTuple<T1,T2,T3,T4>(Tuple<T1,T2,T3,T4>)

Tuple 类的实例转换为 ValueTuple 结构的实例。Converts an instance of the Tuple class to an instance of the ValueTuple structure.

适用于

另请参阅