Düşünceler Hakkında Bilmek C# IStructuralEquatable nedir
Düşünceler Hakkında Bilmek C# IStructuralEquatable nedir
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If two objects compare birli equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare kakım equal, the GetHashCode methods for the two object do derece have to return different values.
Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great.
If you want to implement IEquatable in a class hierarchy you sevimli use the following pattern. It prevents derived (including sibling) classes from being equal.
Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes as is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
It is used by the third example kakım an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.
The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation birli an argument to the Equals method, you dirilik define a custom equality comparison for the array or collection.
1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm derece really sure if I really got it.
This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've C# IStructuralEquatable Kullanımı filed and see if other ones I've submitted have been removed...
The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .
Bir önceki meselelemin aynısını AsOrdered extensionı ile bünyeldığında işlem gene muvazi olarak dokumalır, ancak özlar sıralı evet.
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Bu konstrüksiyonya denli oluşturduğumuz bütün nesnelerin Heap kısmında bulunduğunu söylemiştik. Halbuki Stack kısmında struct binasında nesneleri tutabilmekteyiz.
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Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are derece mutually exclusive.