Tuple<T1,T2,T3,T4,T5,T6,T7>.IStructuralComparable.CompareTo 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

程序集:

mscorlib.dll

程序集:

netstandard.dll

使用指定的比较器将当前的 Tuple<T1,T2,T3,T4,T5,T6,T7> 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。

 virtual int System.Collections.IStructuralComparable.CompareTo(System::Object ^ other, System::Collections::IComparer ^ comparer) = System::Collections::IStructuralComparable::CompareTo;

int IStructuralComparable.CompareTo (object other, System.Collections.IComparer comparer);

abstract member System.Collections.IStructuralComparable.CompareTo : obj * System.Collections.IComparer -> int
override this.System.Collections.IStructuralComparable.CompareTo : obj * System.Collections.IComparer -> int

Function CompareTo (other As Object, comparer As IComparer) As Integer Implements IStructuralComparable.CompareTo

参数

other

Object

要与当前实例进行比较的对象。

comparer

IComparer

提供用于比较的自定义规则的对象。

返回

Int32

一个带符号整数，指示此实例和 other 在排序顺序中的相对位置，如下表所示。

值	说明
负整数	此实例位于 other 之前。
零	此实例在排序顺序中的位置与 other 相同。
正整数	此实例位于 other 之后。

实现

CompareTo(Object, IComparer)

例外

ArgumentException

other 不是 Tuple<T1,T2,T3,T4,T5,T6,T7> 对象。

示例

以下示例创建一个对象数组 Tuple<T1,T2,T3,T4,T5,T6,T7> ，其中包含从 1950 年到 2000 年三个城市的人口数据。 9uple 的第一个组成部分是城市名称。 其余五个组成部分表示从 1950 年到 2000 年的 10 年间隔的人口。

该 PopulationComparer 类提供了一个 IComparer 实现，该实现允许任意一个组件对隔点数组进行排序。 在其构造函数中向 PopulationComparer 类提供两个值：定义排序顺序的组件的位置，以及一个 Boolean 值，该值指示元组对象是否应按升序或降序排序。

然后，该示例按未排序顺序显示数组中的元素，按 1960 年总体) (第三个分量对它们进行排序，并显示它们，然后在 1990 年) 按 1990 年填充 (第六个分量对其进行排序，并显示它们。

using System;
using System.Collections;
using System.Collections.Generic;

public class PopulationComparer<T1, T2, T3, T4, T5, T6, T7> : IComparer
{
   private int itemPosition;
   private int multiplier = -1;

   public PopulationComparer(int component) : this(component, true)
   { }

   public PopulationComparer(int component, bool descending)
   {
      if (! descending) multiplier = 1;

      if (component <= 0 || component > 7)
         throw new ArgumentException("The component argument is out of range.");

      itemPosition = component;
   }

   public int Compare(object x, object y)
   {
      Tuple<T1, T2, T3, T4, T5, T6, T7> tX = x as Tuple<T1, T2, T3, T4, T5, T6, T7>;
      if (tX == null)
      {
         return 0;
      }
      else
      {
         Tuple<T1, T2, T3, T4, T5, T6, T7> tY = y as Tuple<T1, T2, T3, T4, T5, T6, T7>;
         switch (itemPosition)
         {
            case 1:
               return Comparer<T1>.Default.Compare(tX.Item1, tY.Item1) * multiplier;
            case 2:
               return Comparer<T2>.Default.Compare(tX.Item2, tY.Item2) * multiplier;
            case 3:
               return Comparer<T3>.Default.Compare(tX.Item3, tY.Item3) * multiplier;
            case 4:
               return Comparer<T4>.Default.Compare(tX.Item4, tY.Item4) * multiplier;
            case 5:
               return Comparer<T5>.Default.Compare(tX.Item5, tY.Item5) * multiplier;
            case 6:
               return Comparer<T6>.Default.Compare(tX.Item6, tY.Item6) * multiplier;
            case 7:
               return Comparer<T7>.Default.Compare(tX.Item7, tY.Item7) * multiplier;
            default:
               return Comparer<T1>.Default.Compare(tX.Item1, tY.Item1) * multiplier;
         }
      }
   }
}

public class Example
{
   public static void Main()
   {
      // Create array of sextuple with population data for three U.S.
      // cities, 1960-2000.
      Tuple<string, int, int, int, int, int, int>[] cities =
           { Tuple.Create("Los Angeles", 1970358, 2479015, 2816061, 2966850, 3485398, 3694820),
             Tuple.Create("New York", 7891957, 7781984, 7894862, 7071639, 7322564, 8008278),
             Tuple.Create("Chicago", 3620962, 3550904, 3366957, 3005072, 2783726, 2896016) };

      // Display array in unsorted order.
      Console.WriteLine("In unsorted order:");
      foreach (var city in cities)
         Console.WriteLine(city.ToString());
      Console.WriteLine();

      Array.Sort(cities, new PopulationComparer<string, int, int, int, int, int, int>(3));

      // Display array in sorted order.
      Console.WriteLine("Sorted by population in 1960:");
      foreach (var city in cities)
         Console.WriteLine(city.ToString());
      Console.WriteLine();

      Array.Sort(cities, new PopulationComparer<string, int, int, int, int, int, int>(6));

      // Display array in sorted order.
      Console.WriteLine("Sorted by population in 1990:");
      foreach (var city in cities)
         Console.WriteLine(city.ToString());
   }
}
// The example displays the following output:
//    In unsorted order:
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
//    
//    Sorted by population in 1960:
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    
//    Sorted by population in 1990:
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)

open System
open System.Collections
open System.Collections.Generic

type PopulationComparer<'T1, 'T2, 'T3, 'T4, 'T5, 'T6, 'T7>(itemPosition, descending) =
    let multiplier = if descending then -1 else 1

    do
        if itemPosition <= 0 || itemPosition > 7 then
            invalidArg "itemPosition" "The itemPosition argument is out of range."

    new (itemPosition) = PopulationComparer(itemPosition, true)

    interface IComparer with
        member _.Compare(x, y) =
            match x with
            | :? Tuple<'T1, 'T2, 'T3, 'T4, 'T5, 'T6, 'T7> as tX -> 
                let tY = y :?> Tuple<'T1, 'T2, 'T3, 'T4, 'T5, 'T6, 'T7>
                match itemPosition with
                | 1 ->
                    Comparer<'T1>.Default.Compare(tX.Item1, tY.Item1) * multiplier
                | 2 ->
                    Comparer<'T2>.Default.Compare(tX.Item2, tY.Item2) * multiplier
                | 3 ->
                    Comparer<'T3>.Default.Compare(tX.Item3, tY.Item3) * multiplier
                | 4 ->
                    Comparer<'T4>.Default.Compare(tX.Item4, tY.Item4) * multiplier
                | 5 ->
                    Comparer<'T5>.Default.Compare(tX.Item5, tY.Item5) * multiplier
                | 6 ->
                    Comparer<'T6>.Default.Compare(tX.Item6, tY.Item6) * multiplier
                | 7 ->
                    Comparer<'T7>.Default.Compare(tX.Item7, tY.Item7) * multiplier
                | _ ->
                    Comparer<'T1>.Default.Compare(tX.Item1, tY.Item1) * multiplier
            | _ -> 0

// Create array of sextuple with population data for three U.S.
// cities, 1960-2000.
let cities =
    [| Tuple.Create("Los Angeles", 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
       Tuple.Create("New York", 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
       Tuple.Create("Chicago", 3620962, 3550904, 3366957, 3005072, 2783726, 2896016) |]

// Display array in unsorted order.
printfn "In unsorted order:"
for city in cities do
    printfn $"{city}"
printfn ""

Array.Sort(cities, PopulationComparer<string, int, int, int, int, int, int> 3)

// Display array in sorted order.
printfn "Sorted by population in 1960:"
for city in cities do
    printfn $"{city}"
printfn ""

Array.Sort(cities, PopulationComparer<string, int, int, int, int, int, int> 6)

// Display array in sorted order.
printfn "Sorted by population in 1990:"
for city in cities do
    printfn $"{city}"
// The example displays the following output ->
//    In unsorted order ->
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
//    
//    Sorted by population in 1960 ->
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    
//    Sorted by population in 1990 ->
//    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
//    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
//    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)

Imports System.Collections
Imports System.Collections.Generic

Public Class PopulationComparer(Of T1, T2, T3, T4, T5, T6, T7) : Implements IComparer
   Private itemPosition As Integer
   Private multiplier As Integer = -1
      
   Public Sub New(component As Integer)
      Me.New(component, True)
   End Sub
   
   Public Sub New(component As Integer, descending As Boolean)
      If Not descending Then multiplier = 1
      
      If component <= 0 Or component > 7 Then 
         Throw New ArgumentException("The component argument is out of range.")
      End If
      itemPosition = component
   End Sub 
   
   Public Function Compare(x As Object, y As Object) As Integer _
                   Implements IComparer.Compare
 
      Dim tX As Tuple(Of T1, T2, T3, T4, T5, T6, T7) = TryCast(x, Tuple(Of T1, T2, T3, T4, T5, T6, T7))
      If tX Is Nothing Then
         Return 0
      Else
         Dim tY As Tuple(Of T1, T2, T3, T4, T5, T6, T7) = DirectCast(y, Tuple(Of T1, T2, T3, T4, T5, T6, T7))
         Select Case itemPosition
            Case 1
               Return Comparer(Of T1).Default.Compare(tX.Item1, tY.Item1) * multiplier
            Case 2
               Return Comparer(Of T2).Default.Compare(tX.Item2, tY.Item2) * multiplier
            Case 3
               Return Comparer(Of T3).Default.Compare(tX.Item3, tY.Item3) * multiplier
            Case 4
               Return Comparer(Of T4).Default.Compare(tX.Item4, tY.Item4) * multiplier
            Case 5
               Return Comparer(Of T5).Default.Compare(tX.Item5, tY.Item5) * multiplier
            Case 6
               Return Comparer(Of T6).Default.Compare(tX.Item6, tY.Item6) * multiplier
            Case 7
               Return Comparer(Of T7).Default.Compare(tX.Item7, tY.Item7) * multiplier
            ' This should never be reached.
            Case Else
               Return 0
         End Select      
      End If
   End Function
End Class

Module Example
   Public Sub Main()
      ' Create array of sextuple with population data for three U.S. 
      ' cities, 1950-2000.
      Dim cities() = 
          { Tuple.Create("Los Angeles", 1970358, 2479015, 2816061, 2966850, 3485398, 3694820),
            Tuple.Create("New York", 7891957, 7781984, 7894862, 7071639, 7322564, 8008278),  
            Tuple.Create("Chicago", 3620962, 3550904, 3366957, 3005072, 2783726, 2896016) } 
      
      ' Display array in unsorted order.
      Console.WriteLine("In unsorted order:")
      For Each city In cities
         Console.WriteLine(city.ToString())
      Next
      Console.WriteLine()
      
      Array.Sort(cities, New PopulationComparer(Of String, Integer, Integer, Integer, Integer, Integer, Integer)(3)) 
                           
      ' Display array in sorted order.
      Console.WriteLine("Sorted by population in 1960:")
      For Each city In cities
         Console.WriteLine(city.ToString())
      Next
      Console.WriteLine()
      
      Array.Sort(cities, New PopulationComparer(Of String, Integer, Integer, Integer, Integer, Integer, Integer)(6))
                           
      ' Display array in sorted order.
      Console.WriteLine("Sorted by population in 1990:")
      For Each city In cities
         Console.WriteLine(city.ToString())
      Next
   End Sub
End Module
' The example displays the following output:
'    In unsorted order:
'    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
'    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
'    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
'    
'    Sorted by population in 1960:
'    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
'    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)
'    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
'    
'    Sorted by population in 1990:
'    (New York, 7891957, 7781984, 7894862, 7071639, 7322564, 8008278)
'    (Los Angeles, 1970358, 2479015, 2816061, 2966850, 3485398, 3694820)
'    (Chicago, 3620962, 3550904, 3366957, 3005072, 2783726, 2896016)

注解

此成员是显式接口应用。 它只能在 Tuple<T1,T2,T3,T4,T5,T6,T7> 实例被强制转换为 IStructuralComparable 接口时使用。

使用此方法可以定义对象的自定义比较 Tuple<T1,T2,T3,T4,T5,T6,T7> 。 例如，可以使用此方法根据特定组件的值对对象进行排序 Tuple<T1,T2,T3,T4,T5,T6,T7> 。

虽然可以直接调用此方法，但通常由包含参数的集合排序方法 IComparer 调用此方法，以便对集合的成员进行排序。 例如，它由Array.Sort(Array, IComparer)该方法和Add通过使用SortedList.SortedList(IComparer)构造函数实例化的对象的方法SortedList调用。

注意

该方法 IStructuralComparable.CompareTo 用于排序操作。 当比较的主要用途是确定两个对象是否相等时，不应使用它。 若要确定两个对象是否相等，请调用 IStructuralEquatable.Equals 该方法。

另请参阅

• IStructuralEquatable.Equals(Object, IEqualityComparer)