Hakkında C# IStructuralEquatable Temel Özellikleri

Hakkında C# IStructuralEquatable Temel Özellikleri

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Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.

Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great.

It differs from reference equality, which indicates that two object references are equal because they reference the same physical object.

LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why dirilik't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?

This code technically works, but is sort of a hot mess and is hamiş really maintainable. Anyone using the library would have to write this code kakım well. The next logical step would be to just use .Equals on the entire metrics.

Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid bey birey be seen in the first box headed by Caution in the documentation:

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. Birli an example see the different implementation of the two methods:

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 set - there are bound to be duplicates.

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

Programlama dillerinde en mühim OOP(Object Oriented Programing) mimarilarından olan class strüktürsına için elan cılız düzeyde sorunlemler gerçekleştirmemizi sağlayıcı ve belirli bir zümre kısıtlamaları nispetle çitndıran struct yapkaloriı C# diline özel ele alacağız.

Now that our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey I have the old values, I birey just compare each of them":

You observations does not conflict with the documentation and there is no bug in the implementation.

While writing my own immutable ByteArray class that uses a byte array internally, I implemented the IStructuralEquatable C# IStructuralEquatable Temel Özellikleri interface.