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


指定された比較メソッドに基づいて、現在の Tuple<T1,T2,T3,T4,T5> オブジェクトが指定したオブジェクトと等しいかどうかを示す値を返します。Returns a value that indicates whether the current Tuple<T1,T2,T3,T4,T5> 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);
Function Equals (other As Object, comparer As IEqualityComparer) As Boolean Implements IStructuralEquatable.Equals


Object Object Object

このインスタンスと比較するオブジェクト。The object to compare with this instance.

IEqualityComparer IEqualityComparer IEqualityComparer

2 つのオブジェクトが等しいかどうかの評価に使用するメソッドを定義するオブジェクト。An object that defines the method to use to evaluate whether the two objects are equal.


現在のインスタンスが指定したオブジェクトと等しい場合は true。それ以外の場合は falsetrue if the current instance is equal to the specified object; otherwise, false.


次の例では、 DoubleComparer インターフェイスを実装する IEqualityComparer クラスを定義しています。The following example defines a DoubleComparer class that implements the IEqualityComparer interface. 例では、2 つのインスタンスを作成Tuple<T1,T2,T3,T4,T5>2 番目 5 番目のコンポーネントからを乱数ジェネレーターを使用してオブジェクトにキャストする最初のインスタンス、IStructuralEquatableインターフェイス、および、使用、DoubleComparerオブジェクト、2 つのテストをTuple<T1,T2,T3,T4,T5>おおよそ等しいかどうかのオブジェクト。The example instantiates two Tuple<T1,T2,T3,T4,T5> objects by using a random number generator to populate their second through fifth components, casts the first instance to an IStructuralEquatable interface, and then uses a DoubleComparer object to test the two Tuple<T1,T2,T3,T4,T5> objects for approximate equality.

using System;
using System.Collections;

public class DoubleComparer<T1, T2, T3, T4, T5> : IEqualityComparer
   private double difference;
   private int argument = 0;
   public DoubleComparer(double difference)
      this.difference = difference;
   new public bool Equals(object x, object y)
      argument += 1;
      // Return true for Item1.
      if (argument == 1) return true;

      double d1 = (double) x;
      double d2 = (double) y;

      if (d1 - d2 < d1 * difference)
         return true;
         return false;
   public int GetHashCode(object obj)
      if (obj is T1)
         return ((T1) obj).GetHashCode();
      else if (obj is T2)
         return ((T2) obj).GetHashCode();
      else if (obj is T3)
         return ((T3) obj).GetHashCode();
      else if (obj is T4)
         return ((T4) obj).GetHashCode();
         return ((T5) obj).GetHashCode();   

public class Example
   public static void Main()
      var value1 = GetValues(1);
      var value2 = GetValues(2);
      IStructuralEquatable iValue1 = value1;
      Console.WriteLine("{0} =\n{1} :\n{2}", value1, value2, 
                        new DoubleComparer<int, double, double, double, double>(.01)));

   private static Tuple<int, double, double, double, double> GetValues(int ctr)
      // Generate four random numbers between 0 and 1
      Random rnd = new Random((int)DateTime.Now.Ticks >> 32 >> ctr);
      return Tuple.Create(ctr, rnd.NextDouble(), rnd.NextDouble(), 
                          rnd.NextDouble(), rnd.NextDouble());
Imports System.Collections

Public Class DoubleComparer(Of T1, T2, T3, T4, T5) : Implements IEqualityComparer
   Private difference As Double
   Private argument As Integer = 0
   Public Sub New(difference As Double)
      Me.difference = difference
   End Sub
   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      argument += 1
      ' Return true for Item1.
      If argument = 1 Then
         Return True
         Dim d1 As Double = CDbl(x)
         Dim d2 As Double = CDbl(y)
         If d1 - d2 < d1 * difference Then
            Return True
            Return False
         End If
      End If
   End Function
   Public Overloads Function GetHashCode(obj As Object) As Integer _
                    Implements IEqualityComparer.GetHashCode
      If TypeOf obj Is T1 Then
         Return CType(obj, T1).GetHashCode()
      ElseIf TypeOf obj Is T2 Then
         Return CType(obj, T2).GetHashCode()
      ElseIf TypeOf obj Is T3 Then
         Return CType(Obj, T3).GetHashCode()
      ElseIf TypeOf obj Is T4 Then
         Return CType(Obj, T4).GetHashCode()
         Return CType(obj, T5).GetHashCode()
      End If
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim value1 = GetValues(1)
      Dim value2 = GetValues(2)
      Dim iValue1 As IStructuralEquatable = value1
      Console.WriteLine("{0} ={3}{1} :{3}{2}", value1, value2, _
                        iValue1.Equals(value2, _
                        New DoubleComparer(Of Integer, Double, Double, Double, Double)(.01)), _
   End Sub
   Private Function GetValues(ctr As Integer) As Tuple(Of Integer, Double, Double, Double, Double)
      ' Generate four random numbers between 0 and 1
      Dim rnd As New Random(CInt((DateTime.Now.Ticks >> 32) >> ctr))
      Return Tuple.Create(ctr, rnd.NextDouble(), rnd.NextDouble(), 
                          rnd.NextDouble(), rnd.NextDouble)
   End Function                                   
End Module
' The example displays output like the following:
'    (1, 0.910850029862882, 0.894596965934428, 0.319678635019659, 0.801647342649124) =
'    (2, 0.818546649915421, 0.355961162762698, 0.0438506622071614, 0.679904267042831) :
'    False


このメンバーは、明示的なインターフェイス メンバーの実装です。This member is an explicit interface member implementation. これは、Tuple<T1,T2,T3,T4,T5> のインスタンスが IStructuralEquatable インターフェイスにキャストされる場合のみ、使用できます。It can be used only when the Tuple<T1,T2,T3,T4,T5> instance is cast to an IStructuralEquatable interface.

IEqualityComparer.Equals場合にのみ実装が呼び出されますotherないnull、正常にすることができるかどうか、キャスト (C#) または変換 (Visual Basic) で、Tuple<T1,T2,T3,T4,T5>コンポーネントが現在のインスタンスと同じ型のオブジェクト。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> object whose components are of the same types as the current instance. IStructuralEquatable.Equals(Object, IEqualityComparer)メソッドの最初のパス、Item1の値、Tuple<T1,T2,T3,T4,T5>と比較するオブジェクト、IEqualityComparer.Equals実装します。The IStructuralEquatable.Equals(Object, IEqualityComparer) method first passes the Item1 values of the Tuple<T1,T2,T3,T4,T5> objects to be compared to the IEqualityComparer.Equals implementation. このメソッドの呼び出しが返された場合true、メソッドが再度呼び出され、渡された、 Item2 、2 つの値Tuple<T1,T2,T3,T4,T5>オブジェクト。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> objects. これは、メソッドの呼び出しから制御されるまで続行falseの特定のペアを比較するとItem値、または 2 つItem5値は、メソッドに渡されます。This continues until the method call returns false when it compares a specific pair of Item values, or the two Item5 values are passed to the method.