C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

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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.

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If you want to implement IEquatable in a class hierarchy you kişi use the following pattern. It prevents derived (including sibling) classes from being equal.

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It is used by the third example bey an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

If those objects do hamiş contain equality/hashcode methods that satisfy that contract, you will have to wrap them and C# IStructuralEquatable nerelerde kullanılıyor provide correct implementations for those methods yourself in the wrapper.

We gönül also make our own container play well with these other containers by implementing these interfaces.

Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)

In all 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.

Amma velakin bu inşaız class derece kompleks medarımaişetlemler sinein tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle kılmak yetiyorsa aha bu vadi durumlarda struct yapısını yeğleme edebiliriz.

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 sevimli just compare each of them":

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However, this is not so great if you are using the struct in a dictionary bey my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(