Tuple<T1,T2> 类
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
表示 2 元组,或二元组。
generic <typename T1, typename T2>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable
generic <typename T1, typename T2>
public ref class Tuple : IComparable, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable, System::Runtime::CompilerServices::ITuple
public class Tuple<T1,T2> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable
public class Tuple<T1,T2> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable, System.Runtime.CompilerServices.ITuple
[System.Serializable]
public class Tuple<T1,T2> : IComparable, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable
type Tuple<'T1, 'T2> = class
interface IStructuralComparable
interface IStructuralEquatable
interface IComparable
type Tuple<'T1, 'T2> = class
interface IStructuralComparable
interface IStructuralEquatable
interface IComparable
interface ITuple
[<System.Serializable>]
type Tuple<'T1, 'T2> = class
interface IStructuralEquatable
interface IStructuralComparable
interface IComparable
[<System.Serializable>]
type Tuple<'T1, 'T2> = class
interface IStructuralEquatable
interface IStructuralComparable
interface IComparable
interface ITuple
Public Class Tuple(Of T1, T2)
Implements IComparable, IStructuralComparable, IStructuralEquatable
Public Class Tuple(Of T1, T2)
Implements IComparable, IStructuralComparable, IStructuralEquatable, ITuple
类型参数
- T1
此元组的第一个组件的类型。
- T2
此元组的第二个组件的类型。
- 继承
-
Tuple<T1,T2>
- 属性
- 实现
注解
元组是具有特定数目和值序列的数据结构。 类 Tuple<T1,T2> 表示一个 2 元组或一对,它是具有两个组件的元组。 2 元组类似于结构 KeyValuePair<TKey,TValue> 。
可以通过调用Tuple<T1,T2>构造函数或静态Tuple.Create<T1,T2>(T1, T2)方法来实例化Tuple<T1,T2>对象。 可以使用只读 Item1 属性和 Item2 实例属性检索元组组件的值。
元组通常采用四种不同的方式:
表示单个数据集。 例如,元组可以表示数据库中的记录,其组件可以表示该记录的字段。
为了提供对数据集的轻松访问和操作。 以下示例定义包含学生名称及其相应测试分数的对象数组 Tuple<T1,T2> 。 然后循环访问数组以计算平均测试分数。
using System; public class Example { public static void Main() { Tuple<string, Nullable<int>>[] scores = { new Tuple<string, Nullable<int>>("Jack", 78), new Tuple<string, Nullable<int>>("Abbey", 92), new Tuple<string, Nullable<int>>("Dave", 88), new Tuple<string, Nullable<int>>("Sam", 91), new Tuple<string, Nullable<int>>("Ed", null), new Tuple<string, Nullable<int>>("Penelope", 82), new Tuple<string, Nullable<int>>("Linda", 99), new Tuple<string, Nullable<int>>("Judith", 84) }; int number; double mean = ComputeMean(scores, out number); Console.WriteLine("Average test score: {0:N2} (n={1})", mean, number); } private static double ComputeMean(Tuple<string, Nullable<int>>[] scores, out int n) { n = 0; int sum = 0; foreach (var score in scores) { if (score.Item2.HasValue) { n += 1; sum += score.Item2.Value; } } if (n > 0) return sum / (double) n; else return 0; } } // The example displays the following output: // Average test score: 87.71 (n=7)
open System let scores = [| Tuple<string, Nullable<int>>("Jack", 78) Tuple<string, Nullable<int>>("Abbey", 92) Tuple<string, Nullable<int>>("Dave", 88) Tuple<string, Nullable<int>>("Sam", 91) Tuple<string, Nullable<int>>("Ed", Nullable()) Tuple<string, Nullable<int>>("Penelope", 82) Tuple<string, Nullable<int>>("Linda", 99) Tuple<string, Nullable<int>>("Judith", 84) |] let computeMean (scores: Tuple<string, Nullable<int>>[]) (n: int outref) = n <- 0 let mutable sum = 0 for _, score in scores do if score.HasValue then n <- n + 1 sum <- sum + score.Value if n > 0 then double sum / double n else 0 let mutable number = 0 let mean = computeMean scores &number printfn $"Average test score: {mean:N2} (n={number})" // The example displays the following output: // Average test score: 87.71 (n=7)
Module Example Public Sub Main() Dim scores() As Tuple(Of String, Nullable(Of Integer)) = { New Tuple(Of String, Nullable(Of Integer))("Jack", 78), New Tuple(Of String, Nullable(Of Integer))("Abbey", 92), New Tuple(Of String, Nullable(Of Integer))("Dave", 88), New Tuple(Of String, Nullable(Of Integer))("Sam", 91), New Tuple(Of String, Nullable(Of Integer))("Ed", Nothing), New Tuple(Of String, Nullable(Of Integer))("Penelope", 82), New Tuple(Of String, Nullable(Of Integer))("Linda", 99), New Tuple(Of String, Nullable(Of Integer))("Judith", 84) } Dim number As Integer Dim mean As Double = ComputeMean(scores, number) Console.WriteLine("Average test score: {0:N2} (n={1})", mean, number) End Sub Private Function ComputeMean(scores() As Tuple(Of String, Nullable(Of Integer)), ByRef n As Integer) As Double n = 0 Dim sum As Integer For Each score In scores If score.Item2.HasValue Then n += 1 sum += score.Item2.Value End If Next If n > 0 Then Return sum / n Else Return 0 End If End Function End Module ' The example displays the following output: ' Average test score: 87.71 (n=7)
若要返回方法中的
out
多个值,而不使用 C#) 中的参数 (或ByRef
Visual Basic) 中的参数 (。 例如,以下示例使用对象 Tuple<T1,T2> 返回从整数除法得出的商数和余数。using System; public class Class1 { public static void Main() { int dividend, divisor; Tuple<int, int> result; dividend = 136945; divisor = 178; result = IntegerDivide(dividend, divisor); if (result != null) Console.WriteLine(@"{0} \ {1} = {2}, remainder {3}", dividend, divisor, result.Item1, result.Item2); else Console.WriteLine(@"{0} \ {1} = <Error>", dividend, divisor); dividend = Int32.MaxValue; divisor = -2073; result = IntegerDivide(dividend, divisor); if (result != null) Console.WriteLine(@"{0} \ {1} = {2}, remainder {3}", dividend, divisor, result.Item1, result.Item2); else Console.WriteLine(@"{0} \ {1} = <Error>", dividend, divisor); } private static Tuple<int, int> IntegerDivide(int dividend, int divisor) { try { int remainder; int quotient = Math.DivRem(dividend, divisor, out remainder); return new Tuple<int, int>(quotient, remainder); } catch (DivideByZeroException) { return null; } } } // The example displays the following output: // 136945 \ 178 = 769, remainder 63 // 2147483647 \ -2073 = -1035930, remainder 757
open System let integerDivide (dividend: int) divisor = try let quotient, remainder = Math.DivRem(dividend, divisor) Tuple<int, int>(quotient, remainder) with :? DivideByZeroException -> Unchecked.defaultof<Tuple<int, int>> [<EntryPoint>] let main _ = let dividend = 136945 let divisor = 178 let result = integerDivide dividend divisor if box result <> null then printfn $@"{dividend} \ {divisor} = {result.Item1}, remainder {result.Item2}" else printfn $@"{dividend} \ {divisor} = <Error>" let dividend = Int32.MaxValue let divisor = -2073 let result = integerDivide dividend divisor if box result <> null then printfn $@"{dividend} \ {divisor} = {result.Item1}, remainder {result.Item2}" else printfn $@"{dividend} \ {divisor} = <Error>" 0 // The example displays the following output: // 136945 \ 178 = 769, remainder 63 // 2147483647 \ -2073 = -1035930, remainder 757
Module modMain Public Sub Main() Dim dividend, divisor As Integer Dim result As Tuple(Of Integer, Integer) dividend = 136945 : divisor = 178 result = IntegerDivide(dividend, divisor) If result IsNot Nothing Then Console.WriteLine("{0} \ {1} = {2}, remainder {3}", dividend, divisor, result.Item1, result.Item2) Else Console.WriteLine("{0} \ {1} = <Error>", dividend, divisor) End If dividend = Int32.MaxValue : divisor = -2073 result = IntegerDivide(dividend, divisor) If result IsNot Nothing Then Console.WriteLine("{0} \ {1} = {2}, remainder {3}", dividend, divisor, result.Item1, result.Item2) Else Console.WriteLine("{0} \ {1} = <Error>", dividend, divisor) End If End Sub Private Function IntegerDivide(dividend As Integer, divisor As Integer) As Tuple(Of Integer, Integer) Try Dim remainder As Integer Dim quotient As Integer = Math.DivRem(dividend, divisor, remainder) Return New Tuple(Of Integer, Integer)(quotient, remainder) Catch e As DivideByZeroException Return Nothing End Try End Function End Module ' The example displays the following output: ' 136945 \ 178 = 769, remainder 63 ' 2147483647 \ -2073 = -1035930, remainder 757
通过单个参数将多个值传递给方法。 例如,该方法 Thread.Start(Object) 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> 作为方法参数,则可以使用两项数据提供线程的启动例程。
构造函数
Tuple<T1,T2>(T1, T2) |
初始化 Tuple<T1,T2> 类的新实例。 |
属性
Item1 |
获取当前 Tuple<T1,T2> 对象的第一个分量的值。 |
Item2 |
获取当前 Tuple<T1,T2> 对象的第二个分量的值。 |
方法
Equals(Object) |
返回一个值,该值指示当前的 Tuple<T1,T2> 对象是否与指定对象相等。 |
GetHashCode() |
返回当前 Tuple<T1,T2> 对象的哈希代码。 |
GetType() |
获取当前实例的 Type。 (继承自 Object) |
MemberwiseClone() |
创建当前 Object 的浅表副本。 (继承自 Object) |
ToString() |
返回表示此 Tuple<T1,T2> 实例的值的字符串。 |
显式接口实现
IComparable.CompareTo(Object) |
比较当前 Tuple<T1,T2> 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。 |
IStructuralComparable.CompareTo(Object, IComparer) |
使用指定的比较器将当前的 Tuple<T1,T2> 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。 |
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> 对象是否与指定对象相等。 |
IStructuralEquatable.GetHashCode(IEqualityComparer) |
使用指定的计算方法计算当前 Tuple<T1,T2> 对象的哈希代码。 |
ITuple.Item[Int32] |
获取指定 |
ITuple.Length |
获取 |
扩展方法
Deconstruct<T1,T2>(Tuple<T1,T2>, T1, T2) |
将具有 2 个元素的元组解构为不同的变量。 |
ToValueTuple<T1,T2>(Tuple<T1,T2>) |
将 |