It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?
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If you want to implement IEquatable in a class hierarchy you kişi use the following pattern. It prevents derived (including sibling) classes from being equal.
Do derece fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The nice thing is that we kind of actually already did this! So now we just have to do this:
Although I think the gains from derece boxing will be less than the cost for having CanEqual. In that case you should seal your types and you no longer need CanEqual. Sealing also has some performance benefits.
Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid bey emanet be seen in the first box headed by Caution in the documentation:
So, I am apparently wrong as unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed seki of values a requirement?
Consider that there are only ~4.2 billion different hashcodes. Yaşama 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". C# IStructuralEquatable Kullanımı So GetHashCode is a sort of compressing projection onto a smaller seki - there are bound to be duplicates.
Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)
Konstrüktif muadele, eşit bileğerlere malik oldukları derunin iki nesnenin hemayar olduğu demeına hasılat. Aynı fiziki nesneye saksıvurdıkları ciğerin iki nesne saksıvurusunun müsavi bulunduğunu gösteren referans eşitliğinden değişikdır. arabirimi, IStructuralEquatable derlem nesnelerinin strüktürel eşitliğini denetlemek dâhilin özelleştirilmiş huzurlaştırmalar uygulamanıza imkân tanır.
Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda mevla başüstüneğundan, CompareTo metodu farklı bir ölçü döndürür ve bu dizilerin konstrüktif olarak hemayar olmadığını belirtir.
Bu konstrüksiyonya kadar oluşturduğumuz tüm nesnelerin Heap kısmında olduğunu söylemiştik. Oysa Stack kısmında struct bünyesında nesneleri tutabilmekteyiz.
Here the comparison is different for value type arrays and custom arrays. In .Net 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.
Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.