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

 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

Parameters

Retouren

Een ondertekend geheel getal dat de relatieve positie van dit exemplaar en other in de sorteervolgorde aangeeft, zoals wordt weergegeven in de volgende tabel.

Implementeringen

Uitzonderingen

Voorbeelden

In het volgende voorbeeld wordt een matrix gemaakt met Tuple<T1,T2,T3,T4,T5,T6,T7> objecten die populatiegegevens voor drie Amerikaanse steden van 1950 tot 2000 bevatten. Het eerste onderdeel van de septuple is de plaatsnaam. De overige vijf onderdelen vertegenwoordigen de populatie met intervallen van 10 jaar tussen 1950 en 2000.

De PopulationComparer klasse biedt een IComparer implementatie waarmee de matrix van septuples kan worden gesorteerd op een van de onderdelen. Er worden twee waarden opgegeven voor de klasse in de PopulationComparer constructor: de positie van het onderdeel dat de sorteervolgorde definieert en een Boolean waarde die aangeeft of de tuple-objecten in oplopende of aflopende volgorde moeten worden gesorteerd.

In het voorbeeld worden vervolgens de elementen in de matrix in niet-gesorteerde volgorde weergegeven, gesorteerd op het derde onderdeel (de populatie in 1960) en weergegeven en vervolgens gesorteerd op het zesde onderdeel (de populatie in 1990) en weergegeven.

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)

Opmerkingen

Dit lid is een expliciete interface-implementatie. Deze kan alleen worden gebruikt wanneer het Tuple<T1,T2,T3,T4,T5,T6,T7> exemplaar naar een IStructuralComparable interface wordt gecast.

Met deze methode kunt u aangepaste vergelijkingen van Tuple<T1,T2,T3,T4,T5,T6,T7> objecten definiëren. U kunt deze methode bijvoorbeeld gebruiken om objecten te orden Tuple<T1,T2,T3,T4,T5,T6,T7> op basis van de waarde van een specifiek onderdeel.

Hoewel deze methode rechtstreeks kan worden aangeroepen, wordt deze meestal genoemd door methoden voor het sorteren van verzamelingen die parameters bevatten IComparer om de leden van een verzameling te ordenen. Het wordt bijvoorbeeld aangeroepen door de Array.Sort(Array, IComparer) methode en de Add methode van een SortedList object dat wordt geïnstantieerd met behulp van de SortedList.SortedList(IComparer) constructor.

Zie ook

• IStructuralEquatable.Equals(Object, IEqualityComparer)