Tuple<T1,T2,T3> 类

定义

generic <typename T1, typename T2, typename T3>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable

generic <typename T1, typename T2, typename T3>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable, System::Runtime::CompilerServices::ITuple

public class Tuple<T1,T2,T3> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable

[System.Serializable]
public class Tuple<T1,T2,T3> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable

public class Tuple<T1,T2,T3> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable, System.Runtime.CompilerServices.ITuple

type Tuple<'T1, 'T2, 'T3> = class
    interface IStructuralComparable
    interface IStructuralEquatable
    interface IComparable

[<System.Serializable>]
type Tuple<'T1, 'T2, 'T3> = class
    interface IStructuralEquatable
    interface IStructuralComparable
    interface IComparable

[<System.Serializable>]
type Tuple<'T1, 'T2, 'T3> = class
    interface IStructuralEquatable
    interface IStructuralComparable
    interface IComparable
    interface ITuple

type Tuple<'T1, 'T2, 'T3> = class
    interface IStructuralComparable
    interface IStructuralEquatable
    interface IComparable
    interface ITuple

Public Class Tuple(Of T1, T2, T3)
Implements IComparable, IStructuralComparable, IStructuralEquatable

Public Class Tuple(Of T1, T2, T3)
Implements IComparable, IStructuralComparable, IStructuralEquatable, ITuple

类型参数

继承

Object

Tuple<T1,T2,T3>

属性

SerializableAttribute

实现

IStructuralComparable IStructuralEquatable IComparable ITuple

注解

元组是具有特定数字和值序列的数据结构。 该 Tuple<T1,T2,T3> 类表示一个 3 元组或三元组，它是具有三个组件的元组。

可以通过调用Tuple<T1,T2,T3>构造函数或静态Tuple.Create<T1,T2,T3>(T1, T2, T3)方法来实例化Tuple<T1,T2,T3>对象。 可以使用只读Item1Item2和Item3实例属性检索元组组件的值。

元组通常以四种不同的方式使用：

• 表示单个数据集。 例如，元组可以表示数据库记录，其组件可以表示记录的各个字段。

• 为了提供对数据集的轻松访问和操作。 以下示例定义一个对象数组 Tuple<T1,T2,T3> ，这些对象包含学生名称、其平均考试分数和所参加的测试数。 数组传递给 ComputeStatistics 方法，该方法计算测试分数的平均值和标准偏差。

  using System;
  
  public class Example
  {
     public static void Main()
     {
        Tuple<string, double, int>[] scores = 
                      { Tuple.Create("Jack", 78.8, 8),
                        Tuple.Create("Abbey", 92.1, 9), 
                        Tuple.Create("Dave", 88.3, 9),
                        Tuple.Create("Sam", 91.7, 8), 
                        Tuple.Create("Ed", 71.2, 5),
                        Tuple.Create("Penelope", 82.9, 8),
                        Tuple.Create("Linda", 99.0, 9),
                        Tuple.Create("Judith", 84.3, 9) };
        var result = ComputeStatistics(scores);
        Console.WriteLine("Mean score: {0:N2} (SD={1:N2}) (n={2})", 
                          result.Item2, result.Item3, result.Item1);
     }
  
     private static Tuple<int, double, double> ComputeStatistics(Tuple<string, double, int>[] scores) 
     {
        int n = 0;
        double sum = 0;
  
        // Compute the mean.
        foreach (var score in scores)
        {
           n += score.Item3;
           sum += score.Item2 * score.Item3;
        }
        double mean = sum / n;
        
        // Compute the standard deviation.
        double ss = 0;
        foreach (var score in scores)
        {
           ss = Math.Pow(score.Item2 - mean, 2);
        }
        double sd = Math.Sqrt(ss/scores.Length);
        return Tuple.Create(scores.Length, mean, sd);
     }
  }
  // The example displays the following output:
  //       Mean score: 87.02 (SD=0.96) (n=8)
  

  open System
  
  let computeStatistics (scores: Tuple<string, double, int>[]) = 
      let mutable n = 0
      let mutable sum = 0.
  
      // Compute the mean.
      for score in scores do
          n <- n + score.Item3
          sum <- sum + score.Item2 * double score.Item3
      let mean = sum / double n
      
      // Compute the standard deviation.
      let mutable ss = 0.
      for score in scores do
          ss <- (score.Item2 - mean) ** 2.
      let sd = sqrt (ss / double scores.Length)
      Tuple.Create(scores.Length, mean, sd)
  
  let scores = 
      [| Tuple.Create("Jack", 78.8, 8)
         Tuple.Create("Abbey", 92.1, 9) 
         Tuple.Create("Dave", 88.3, 9)
         Tuple.Create("Sam", 91.7, 8) 
         Tuple.Create("Ed", 71.2, 5)
         Tuple.Create("Penelope", 82.9, 8)
         Tuple.Create("Linda", 99.0, 9)
         Tuple.Create("Judith", 84.3, 9) |]
  let result = computeStatistics scores
  printfn $"Mean score: {result.Item2:N2} (SD={result.Item3:N2}) (n={result.Item1})"
  // The example displays the following output:
  //       Mean score: 87.02 (SD=0.96) (n=8)
  

  Module Example
     Public Sub Main()
        Dim scores() = 
                        { Tuple.Create("Jack", 78.8, 8),
                          Tuple.Create("Abbey", 92.1, 9), 
                          Tuple.Create("Dave", 88.3, 9),
                          Tuple.Create("Sam", 91.7, 8), 
                          Tuple.Create("Ed", 71.2, 5),
                          Tuple.Create("Penelope", 82.9, 8),
                          Tuple.Create("Linda", 99.0, 9),
                          Tuple.Create("Judith", 84.3, 9) }
        Dim result = ComputeStatistics(scores)
        Console.WriteLine("Mean score: {0:N2} (SD={1:N2}) (n={2})", 
                          result.Item2, result.Item3, result.Item1)
     End Sub
     
     Private Function ComputeStatistics(scores() As Tuple(Of String, Double, Integer)) _ 
                                  As Tuple(Of Integer, Double, Double)
        Dim n As Integer = 0      
        Dim sum As Double = 0
        
        ' Compute the mean.
        For Each score In scores
           n+= score.Item3 
           sum += score.Item2 * score.Item3
        Next     
        Dim mean As Double = sum / n
  
        ' Compute the standard deviation.
        Dim ss As Double = 0
        For Each score In scores
           ss = Math.Pow(score.Item2 - mean, 2)
        Next
        Dim sd As Double = Math.Sqrt(ss/scores.Length)
        Return Tuple.Create(scores.Length, mean, sd)
     End Function
  End Module
  ' The example displays the following output:
  '       Mean score: 87.02 (SD=0.96) (n=8)
  

• 在不使用 out 参数（在 C# 中）或 ByRef 参数（在 Visual Basic 中）的情况下从方法返回多个值。 例如，上一个示例在对象中 Tuple<T1,T2,T3> 返回其摘要测试分数统计信息。

• 通过单个参数将多个值传递给方法。 例如， Thread.Start(Object) 该方法具有一个参数，用于向线程在启动时执行的方法提供一个值。 如果提供对象 Tuple<T1,T2,T3> 作为方法参数，则可以提供线程的启动例程，其中包含三个数据项。

另请参阅

• Tuple
• Tuple<T1>
• Tuple<T1,T2>
• Tuple<T1,T2,T3,T4>
• Tuple<T1,T2,T3,T4,T5>
• Tuple<T1,T2,T3,T4,T5,T6>
• Tuple<T1,T2,T3,T4,T5,T6,T7>
• Tuple<T1,T2,T3,T4,T5,T6,T7,TRest>