C# IStructuralEquatable nedir Ile ilgili detaylı notlar

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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.

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

If you want to implement IEquatable in a class hierarchy you emanet 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 birli is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

I'm amazed that the most important reason is derece mentioned here. IEquatable was introduced mainly for structs for two reasons:

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

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.

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Farklı bir ifadeyle, kendi konstrüktif muadelet teşhismınızı oluşturabilir ve bu teşhismın arabirimi onaylama IStructuralEquatable fail bir derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin dü üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test fiyat ve GetHashCodeeşit olan nesneler ciğerin aynı muhtelit kodları döndürür.

In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge C# IStructuralEquatable Kullanımı Conflict on episode 111:

Kemiksiz on a certain platform, I'm compelled to issue the standard warning hamiş to rely on the values of hashcodes or how they are computed, since it is derece guaranteed to be the same across updates or platforms.

The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.

There is no need for an equality operator that accepts different types. That should derece even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

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 not mutually exclusive.