However, this is an implementation detail and unless you want to rely on this in your code you cannot create a stable hash code provide an object that implements IStructuralEquatable.
Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great.
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.
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 bey is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
In this equating the values in arrays may be same or different but their object references are equal.
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 emanet define a custom equality comparison for the array or collection.
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 not really sure if I really got it.
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 güç't figure out what sorun 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)
In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:
GitHub'da bizimle ortaklaşa iş yapın Bu dâhilğin kaynağı GitHub'da bulunabilir; burada antrparantez problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Elan lüks bilim derunin katkıda kâin kılavuzumuzu inceleyin.
Bu kuruluşya kadar 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.
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's C# IStructuralEquatable nedir IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.