Tuple<T1,T2,T3,T4,T5,T6>.IStructuralEquatable.Equals(Object, IEqualityComparer) Methode

Definition

Gibt einen Wert zurück, der auf Grundlage einer angegebenen Vergleichsmethode angibt, ob das aktuelle Tuple<T1,T2,T3,T4,T5,T6>-Objekt gleich einem angegebenen Objekt ist.Returns a value that indicates whether the current Tuple<T1,T2,T3,T4,T5,T6> object is equal to a specified object based on a specified comparison method.

 virtual bool System.Collections.IStructuralEquatable.Equals(System::Object ^ other, System::Collections::IEqualityComparer ^ comparer) = System::Collections::IStructuralEquatable::Equals;
bool IStructuralEquatable.Equals (object other, System.Collections.IEqualityComparer comparer);
abstract member System.Collections.IStructuralEquatable.Equals : obj * System.Collections.IEqualityComparer -> bool
override this.System.Collections.IStructuralEquatable.Equals : obj * System.Collections.IEqualityComparer -> bool
Function Equals (other As Object, comparer As IEqualityComparer) As Boolean Implements IStructuralEquatable.Equals

Parameter

other
Object

Das Objekt, das mit dieser Instanz verglichen werden soll.The object to compare with this instance.

comparer
IEqualityComparer

Ein Objekt, das die Methode definiert, mit der ermittelt wird, ob die beiden Objekte gleich sind.An object that defines the method to use to evaluate whether the two objects are equal.

Gibt zurück

Boolean

true, wenn die aktuelle Instanz gleich dem angegebenen Objekt ist, andernfalls false.true if the current instance is equal to the specified object; otherwise, false.

Implementiert

Beispiele

Im folgenden Beispiel wird eine RateComparer Klasse definiert, die einen benutzerdefinierten Test auf Gleichheit ausführt.The following example defines a RateComparer class that performs a custom test for equality. Wenn die an die-Methode übergebenen Werte IStructuralEquatable.Equals vom Typ Single oder sind Double , testet die Methode auf Gleichheit, indem nur bis zu drei Dezimalstellen verwendet werden.If the values that are passed to its IStructuralEquatable.Equals method are of type Single or Double, the method tests for equality by using only up to three fractional digits. Andernfalls ruft Sie einfach die x -Methode des-Parameters auf Equals .Otherwise, it simply calls the x parameter's Equals method. Im Beispiel wird diese IEqualityComparer Implementierung verwendet, um zu bestimmen, ob vier Tuple<T1,T2,T3,T4,T5,T6> Objekte, die Daten über die auffüllungs Rate zwischen 1960 und 2000 enthalten, gleich sind.The example uses this IEqualityComparer implementation to determine whether four Tuple<T1,T2,T3,T4,T5,T6> objects that contain data on the rate of population change between 1960 and 2000 are equal.

using System;
using System.Collections;

public class RateComparer<T1, T2, T3, T4, T5, T6> : IEqualityComparer
{
   private int argument = 0;

   public new bool Equals(object x, object y) 
   {
      argument++;
      if (argument == 1) return true;

      double fx, fy; 
      if (x is Double || x is Single)
      {
            fx = (double) x;
            fy = (double) y;
            return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000));
      }
      else
      {
         return x.Equals(y);
      }
   }
   
   public int GetHashCode(object obj)
   {
      if (obj is Single || obj is Double)
         return Math.Round(((double) obj) * 1000).GetHashCode();
      else
         return obj.GetHashCode();
   }                
}

public class Example
{
   public static void Main()
   {
      var rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079);
      var rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912);
      IStructuralEquatable eq = rate1;
      // Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString());
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, new RateComparer<string, double, double, double, double, double>()));
   }
}
// The example displays the following output:
//    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
//       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False
Imports System.Collections

Public Class RateComparer(Of T1, T2, T3, T4, T5, T6) : Implements IEqualityComparer
   Private argument As Integer = 0

   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      argument += 1
      If argument = 1 Then
         Return True
      Else
         Dim fx, fy As Double
         If typeof x Is Double Or typeof x Is Single Then
            fx = CDbl(x)
            fy = CDbl(y)
            Return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000))
         Else
            Return x.Equals(y)
         End If
      End If   
   End Function
   
   Public Overloads Function GetHashCode(obj As Object) As Integer _
                    Implements IEqualityComparer.GetHashCode
      If TypeOf(obj) Is Single Or TypeOf(obj) Is Double Then
         Return Math.Round(CDbl(obj) * 1000).GetHashCode()
      Else
         Return obj.GetHashCode()
      End If
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079)
      Dim rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912)
      Dim eq As IStructuralEquatable = rate1
      ' Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString())
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
   End Sub
End Module
' The example displays the following output:
'    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
'       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False

Hinweise

Bei diesem Member handelt es sich um eine explizite Schnittstellenmemberimplementierung.This member is an explicit interface member implementation. Er kann nur verwendet werden, wenn die Tuple<T1,T2,T3,T4,T5,T6>-Instanz in eine IStructuralEquatable-Schnittstelle umgewandelt wird.It can be used only when the Tuple<T1,T2,T3,T4,T5,T6> instance is cast to an IStructuralEquatable interface.

Die IEqualityComparer.Equals -Implementierung wird nur aufgerufen other , wenn nicht ist null , und wenn Sie erfolgreich umgewandelt werden kann (in c#) oder (in Visual Basic) in ein-Objekt konvertiert werden kann, Tuple<T1,T2,T3,T4,T5,T6> dessen Komponenten denselben Typ wie die aktuelle Instanz aufweisen.The IEqualityComparer.Equals implementation is called only if other is not null, and if it can be successfully cast (in C#) or converted (in Visual Basic) to a Tuple<T1,T2,T3,T4,T5,T6> object whose components are of the same types as the current instance. Die- IStructuralEquatable.Equals(Object, IEqualityComparer) Methode übergibt zuerst die Item1 Werte der-Objekte, die mit der- Tuple<T1,T2,T3,T4,T5,T6> Implementierung verglichen werden sollen IEqualityComparer.Equals .The IStructuralEquatable.Equals(Object, IEqualityComparer) method first passes the Item1 values of the Tuple<T1,T2,T3,T4,T5,T6> objects to be compared to the IEqualityComparer.Equals implementation. Wenn dieser Methodenaufruf zurückgibt true , wird die-Methode erneut aufgerufen und die Item2 Werte der beiden-Objekte übermittelt Tuple<T1,T2,T3,T4,T5,T6> .If this method call returns true, the method is called again and passed the Item2 values of the two Tuple<T1,T2,T3,T4,T5,T6> objects. Dies wird so lange fortgesetzt, bis der Methoden Rückruf false beim Vergleich eines bestimmten paar von Werten zurückgibt Item oder die beiden Item6 Werte an die-Methode weitergegeben werden.This continues until the method call returns false when it compares a specific pair of Item values, or the two Item6 values are passed to the method.

Gilt für: