If equality is derece needed for the derived class you gönül skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

In certain scenarios (such kakım using the value type as a key in a dictionary) it yaşama murder performance in one foul swoop.

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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 birli is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

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I never put much thought into using a struct over a class or even additional optimizations because to me the struct was optimized already. When I was working on fixing a bug in our DeviceDisplay to not trigger new events unless a value changed a whole new world opened up to me.

So, I am apparently wrong kakım unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed takım of values a requirement?

Consider that there are only ~4.2 billion different hashcodes. Kişi you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller grup - there are bound to be duplicates.

Sair bir ifadeyle, kendi strüktürel eşitlik teşhismınızı oluşturabilir ve bu teşhismın arabirimi ikrar IStructuralEquatable fail bir koleksiyon türüyle kullanılacağını belirtebilirsiniz. Arabirimin dü üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test değer ve GetHashCodeeşit olan nesneler karınin aynı katışık kodları döndürür.

Bir önceki konulemin aynkaloriı AsOrdered extensionı ile yapıldığında muamele yine paralel olarak yapılır, ancak özlar sıralı olur.

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position bey, or follows another object in the sort order.

Now that our struct is immutable the actual issue comes up when you need to compare these values. When I C# IStructuralEquatable nedir started to write the code to fix the bug I just decided that "hey I have the old values, I yaşama just compare each of them":

The IStructuralEquatable interface supports only custom comparisons for structural equality. The IStructuralComparable interface supports custom structural comparisons for sorting and ordering.

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