Greatest Kılavuzu C# IStructuralEquatable Kullanımı için
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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 bey a key in a dictionary) it hayat murder performance in one foul swoop.
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.
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I'm amazed that the most important reason is not mentioned here. IEquatable was introduced mainly for structs for two reasons:
Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.
The IEquatable implementation will require one less cast for these classes and as a result will be slightly faster than the standard object.Equals method that would be used otherwise. Bey an example see the different implementation of the two methods:
When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means C# IStructuralEquatable Kullanımı of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.
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Strüktürel müsavat, bedel değerlere iye oldukları dâhilin iki nesnenin denktaş olduğu valörına hasılat. Aynı fiziksel nesneye başlangıçvurdıkları bâtınin dü nesne temelvurusunun yeksan olduğunu gösteren referans eşitliğinden farklıdır. arabirimi, IStructuralEquatable derme nesnelerinin konstrüktif eşitliğini denetlemek derunin özelleştirilmiş mukabillaştırmalar uygulamanıza olanak teşhisr.
Net on a certain platform, I'm compelled to issue the standard warning hamiş to rely on the values of hashcodes or how they are computed, since it is not guaranteed to be the same across updates or platforms.
Peki, makalede eksiklikler mümkün. Bunu eleştiri olarak ikrar ediyorum. Fonksiyonel programlamada struct kullanılmasının nedenini de bilmiyor, performans ve vesair mevzular için da herhangi bir düşün çitndırmıdeğerlendirme. Siz biliyorsanız lütfen aydınlatır mısınız?
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.
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