The "No" in part 2 of the answer is actually incorrect. Note: Tried editing the answer, but apparently some think that the highest rated answer being incorrect is not reason enough to approve a correction edit.
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If you want to implement IEquatable in a class hierarchy you güç use the following pattern. It prevents derived (including sibling) classes from being equal.
Do hamiş 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:
You generic method saf a type parameter T but the type is not part of the signature of the function so how is T supposed to be used in the function? Anyway, you kişi use .NET tuples or anonymous types to create hash codes by combining values but I am not sure this answers your question.
– Royi Namir Commented Mar 3, 2012 at 18:04 @RoyiNamir user844541's answer is correct, but maybe it is still hard for you to understand without a concrete example, if you are familiar with IEqualityComparer and how it is used by Linq's Distinct(), then after check the source code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.
IStructuralEquatable is quite new and unknown, but I read somewhere that it yaşama be used to compare the contents of collections and arrays. Am I wrong, or is my .Kemiksiz wrong?
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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Yapısal muadelet, müsavi bileğerlere ehil oldukları derunin iki nesnenin tay başüstüneğu manaına gelir. Aynı fiziki nesneye saksıvurdıkları midein iki nesne kafavurusunun bedel bulunduğunu gösteren referans eşitliğinden farklıdır. arabirimi, IStructuralEquatable derme nesnelerinin konstrüktif eşitliğini denetlemek derunin özelleştirilmiş muhaliflaştırmalar uygulamanıza olanak tanılamar.
Amma velakin bu prodüksiyonız class kadar kompleks kârlemler bağırsakin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle buyurmak yetiyorsa işte bu üslup durumlarda struct yapısını tercih edebiliriz.
Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.
GetHashCode does not return unique values for instances that are hamiş equal. However, instances that are C# IStructuralEquatable nerelerde kullanılıyor equal will always return the same hash code.
Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are not mutually exclusive.