Temel İlkeleri C# IStructuralEquatable nerelerde kullanılıyor

Temel İlkeleri C# IStructuralEquatable nerelerde kullanılıyor

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If equality is hamiş needed for the derived class you birey skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

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

. The best example of this is arrays, which with .Kupkuru 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:

IStructuralComparable arayüzü, ekseriya Array ve Tuple kabil muta kuruluşları tarafından uygulanır. Bu data dokumaları, elemanlarının sıralamasını ve yapısını dikkate alarak zıtlaştırma yapar.

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.

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

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Consider that there are only ~4.2 billion different hashcodes. Sevimli you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller seki - there are bound to be duplicates.

Diğer bir ifadeyle, kendi yapısal denklik tanımınızı oluşturabilir ve bu tanımın arabirimi onaylama IStructuralEquatable eden bir derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin iki üyesi vardır: Equals, tamlanan IEqualityComparer bir uygulamayı kullanarak eşitliği test paha ve GetHashCodeeşit olan nesneler sinein aynı katışık kodları döndürür.

When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable dirilik be useful.

To achieve C# IStructuralEquatable Temel Özellikleri this, employee objects with matching SSN properties would be treated as logically equal, even if they were hamiş structurally equal. Share Improve this answer Follow

IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.

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The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.