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 emanet use the following pattern. It prevents derived (including sibling) classes from being equal.
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 not 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 as an argument to the Equals method, you gönül define a custom equality comparison for the array or collection.
1 My understanding is that C# IStructuralEquatable Nasıl kullanılır 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.
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
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Bu örnekte, articles1 ve articles2 dizileri aynı makale kafalıklarına aynı sırada sahip olduğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak eşit bulunduğunu belirtir.
Amma velakin bu yapımız class denli kompleks kârlemler midein tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle geçirmek yetiyorsa işte bu janr durumlarda struct yapısını yeğleme edebiliriz.
IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.
Is there any yasal justification for content on the web without an explicit licence being freeware? more hot questions
3 feature called Tuple Equality! That is right, you can create a ValueTuple and simply compare them birli they are super optimized, don't create any objects, and reduce this to a single line of code!