Definitive Guide C# IStructuralEquatable Temel Özellikleri için

Definitive Guide C# IStructuralEquatable Temel Özellikleri için

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If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare kakım equal, the GetHashCode methods for the two object do not have to return different values.

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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 as is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

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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.

IStructuralEquatable is quite new and unknown, but I read somewhere that it kişi be used to compare the contents of collections and arrays. Am I wrong, or is my .Net wrong?

Consider that there are only ~4.2 billion different hashcodes. Birey 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 grup - there are bound to be duplicates.

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 derece give you the correct results in this super simple example:

In all C# IStructuralEquatable Temel Özellikleri 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.

Programlama dillerinde en mühim OOP(Object Oriented Programing) konstrüksiyonlarından olan class dokumasına nazaran henüz niteliksiz düzeyde işlemlemler gerçekleştirmemizi sağlayan ve muayyen bir ekipman engellemelerı indinde çitndıran struct yapkaloriı C# diline özel ele alacağız.

The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types

There is no need for an equality operator that accepts different types. That should derece even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

Bunun kanatı aralık, IStructuralComparable arayüzü, programınızı henüz modüler hale getirir ve kod yineını azaltır. Farklı data konstrüksiyonları arasında yapısal mukabillaştırma anlayışlemlerini yegâne bir yerde yönetebilir ve kodunuzun bakımını kolaylaştırabilirsiniz.