C# IStructuralEquatable nerelerde kullanılıyor Herkes İçin Eğlenceli Olabilir

C# IStructuralEquatable nerelerde kullanılıyor Herkes İçin Eğlenceli Olabilir

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If two objects compare kakım equal, the GetHashCode method for each object must return the same value. However, if two objects do derece compare kakım equal, the GetHashCode methods for the two object do derece have to return different values.

Bu sayede, data binalarının mideindeki verilerin sıralanması yahut önlaştırılması ustalıklemleri özelleştirilebilir ve arama edilebilir hale gelir.

g. MyType and Object) which will still use the identity comparison. I suspect it's not a great idea to do this unless it's going to be a very heavily used type in your code, where everyone will become very familiar with it and

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

Let us not forget about additional operators and derece just relying on Equals. We dirilik implement the == and != operators easily:

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

If those objects do hamiş contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.

I've noticed these two interfaces, and several associated classes, have been added in .Kupkuru 4. They seem a bit superfluous to me; I've read several blogs about them, but I still kişi't figure out what sıkıntı they solve that was tricky before .Kemiksiz 4.

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)

If you read this entire post and are thinking wow that is a lot of code and steps to remember then do not fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:

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

Beli, makalede nekais olabilir. Bunu tenkit olarak kabul ediyorum. Işlevsel programlamada struct kullanılmasının nedenini de bilmiyor, başarım ve gayrı mevzular için da rastgele bir düşünce çitndırmıyorum. Siz biliyorsanız lütfen aydınlatır mkaloriız?

Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output C# IStructuralEquatable Kullanımı from the example shows, the first three method calls return true, whereas the fourth call returns false.

However, this is hamiş so great if you are using the struct in a dictionary bey my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(