En iyi Tarafı C# IStructuralEquatable nerelerde kullanılıyor

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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 emanet use the following pattern. It prevents derived (including sibling) classes from being equal.

Kakım far kakım I see this is only exposed through the StructuralComparisons class. The only way I birey figure out to make this useful is to make a StructuralEqualityComparer helper class kakım follow:

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 özgü some performance benefits.

Your concern is that Object.GetHashCode() does not provide values that are stable and the concern is very valid as can be seen in the first box headed by Caution in the documentation:

After some more testing I found that any two arrays with the same first element have the same hash. I still think this is strange behavior.

This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've filed and see if other ones I've submitted have been removed...

Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing for each member. Additionally, he mentions that a memory comparison may hamiş give you the correct results in this super simple example:

In Xamarin.Essentials we use the C# struct all over the place to encapsulate "small groups of related variables" for our event handlers. They are groups of veri that don't need to be created by the developers consuming the data and are only really used for reading the data.

GitHub'da bizimle ortaklaşa iş yapın Bu gönülğin kaynağı GitHub'da bulunabilir; burada başkaca problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Daha şu denli veri yürekin katkıda kâin kılavuzumuzu inceleyin.

The contract of Equals differs from that of IStructuralEquatable, C# IStructuralEquatable nerelerde kullanılıyor in that it indicates whether 2 objects are logically equal.

The IStructuralEquatable interface supports only custom comparisons for structural equality. The IStructuralComparable interface supports custom structural comparisons for sorting and ordering.

3 feature called Tuple Equality! That is right, you gönül 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!