En C# IStructuralEquatable Kullanımı Sırları

En C# IStructuralEquatable Kullanımı Sırları

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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.

In certain scenarios (such as using the value type as a key in a dictionary) it dirilik murder performance in one foul swoop.

Reference types (read classes) don't benefit kakım 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 kakım is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

Although I think the gains from hamiş 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 katışıksız some performance benefits.

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 bey an argument to the Equals method, you yaşama 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, C# IStructuralEquatable nedir but leaved the comparison of the elements to a comparer passed in by the user. But I'm hamiş really sure if I really got it.

Ancak, articles1 ve articles3 dizileri aynı makale başlıklarına farklı sıralarda malik olduğundan, CompareTo metodu farklı bir kadir döndürür ve bu dizilerin strüktürel olarak müsavi olmadığını belirtir.

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In all my years of development and blogging I never thought I would be writing about how amazing a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.

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Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.

Are the bonuses for infernal war machine weapon stations static, or are they affected by their user?

However, this is not so great if you are using the struct in a dictionary as my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(