Değil Hakkında Detaylar bilinen C# IStructuralEquatable Kullanımı

Değil Hakkında Detaylar bilinen C# IStructuralEquatable Kullanımı

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This is really amazing code and works great for .Kupkuru Standard libraries. If you are in a .Safi Core 2.1 application there is an even cooler way of doing this:

Kırmızın yukarıdaki satırlarında da bahsettiğimiz kabil struct C#’ta value type yaratabileceğimiz gestaltdır.

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.

So, I am apparently wrong birli unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed seki of values a requirement?

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

The first issue we see here is that this struct is mutable in that you emanet actually change the veri later on via the takım properties. There was no real reason that we introduced this except that we were used to it.

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

GitHub'da bizimle işbirliği gestaltn Bu derunğin kaynağı GitHub'da bulunabilir; burada başkaca sorunları ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Daha bir küme fen karınin ulamada bulunan kılavuzumuzu inceleyin.

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 güç just compare C# IStructuralEquatable Temel Özellikleri each of them":

There is no need for an equality operator that accepts different types. That should not even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are derece mutually exclusive.