The individual calls to IEqualityComparer.Equals end and the IStructuralEquatable.Equals method returns a value either when a method call returns false or after all array elements or tuple components have been compared.
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If you want to implement IEquatable in a class hierarchy you yaşama use the following pattern. It prevents derived (including sibling) classes from being equal.
Kakım far birli I see this is only exposed through the StructuralComparisons class. The only way I kişi figure out to make this useful is to make a StructuralEqualityComparer helper class bey follow:
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.
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 derece trigger new events unless a value changed a whole new world opened up to me.
The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear C# IStructuralEquatable Kullanımı by the fact that this interface resides in the System.Collections namespace.
I've noticed these two interfaces, and several associated classes, have been added in .Safi 4. They seem a bit superfluous to me; I've read several blogs about them, but I still gönül't figure out what sıkıntı they solve that was tricky before .Safi 4.
comparer IEqualityComparer İki nesnenin denktaş olup olmadığını değerlendirmek ciğerin kullanılacak yöntemi teşhismlayan nesne.
Bir önceki işlemlemin aynısını AsOrdered extensionı ile yapıldığında muamele yine koşut olarak kuruluşlır, fakat özlar sıralı olabilir.
C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position kakım, or follows another object in the sort order.
Bu bünyeya derece oluşturduğumuz bütün nesnelerin Heap kısmında olduğunu söylemiştik. Oysa Stack kısmında struct strüktürsında nesneleri tutabilmekteyiz.
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.