Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler
Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler
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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.
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The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.
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.
In this equating the values in arrays may be same or different but their object references are equal.
– 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 C# IStructuralEquatable Kullanımı code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.
If those objects do not contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.
I've noticed these two interfaces, and several associated classes, have been added in .NET 4. They seem a bit superfluous to me; I've read several blogs about them, but I still gönül't figure out what sıkıntı they solve that was tricky before .Kemiksiz 4.
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Amma velakin bu inşaız class kadar kompleks anlayışlemler dâhilin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle eylemek yetiyorsa işte bu usul durumlarda struct yapısını yeğleme edebiliriz.
The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
Bunun yüzı sıra, IStructuralComparable arayüzü, programınızı elan modüler hale getirir ve kod yineını azaltır. Farklı data yapıları beyninde konstrüktif zıtlaştırma çalışmalemlerini bir numara bir yerde yönetebilir ve kodunuzun hizmetını kolaylaştırabilirsiniz.