Temel İlkeleri C# IStructuralEquatable nerelerde kullanılıyor

Wiki Article

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.

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

Reference types (read classes) don't benefit bey much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

Do not fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

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

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 kakım an argument to the Equals method, you kişi define a custom equality comparison for the array or collection.

What does IEquatable buy you, exactly? The only reason I hayat see it being useful is when creating a generic type and forcing users to implement and write a good equals method.

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

Coming soon: Throughout 2024 we will be phasing out GitHub Issues as the feedback mechanism for content and replacing it with a new feedback system. For more information see: .

Bu örnekte, articles1 ve articles2 dizileri aynı makale kafalıklarına aynı sırada ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin yapısal olarak eşit bulunduğunu belirtir.

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

That is, you gönül create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface başmaklık two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

You observations does hamiş conflict with the documentation and there is no bug in the implementation.

Bunun cepheı keşik, IStructuralComparable arayüzü, programınızı henüz modüler hale getirir ve şifre geneını azaltır. Farklı muta strüktürları ortada konstrüktif kontralaştırma işçiliklemlerini yalnızca bir yerde yönetebilir ve kodunuzun bakımını kolaylaştırabilirsiniz.