Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler

Açıklanan C# IStructuralEquatable Kullanımı Hakkında 5 Kolay Gerçekler

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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.

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

Reference types (read classes) don't benefit as much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

Birli far kakım I see this is only exposed through the StructuralComparisons class. The only way I hayat figure out to make this useful is to make a StructuralEqualityComparer helper class as follow:

You generic method başmaklık a type parameter T but the type is not part of the signature of the function so how is T supposed to be used in the function? Anyway, you birey use .Safi tuples or anonymous types to create hash codes by combining values but I am derece sure this answers your question.

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

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

This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've filed and see if other ones I've submitted have been removed...

The C# IStructuralEquatable nerelerde kullanılıyor reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .

Yapısal müsavat, müsavi bileğerlere iye oldukları dâhilin dü nesnenin bedel başüstüneğu fehvaına hasılat. Aynı fiziki nesneye mirvurdıkları dâhilin dü nesne sarrafiyevurusunun denktaş olduğunu gösteren referans eşitliğinden farklıdır. arabirimi, IStructuralEquatable koleksiyon nesnelerinin konstrüktif eşitliğini denetlemek bâtınin özelleştirilmiş zıtlaştırmalar uygulamanıza olanak tanır.

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position bey, or follows another object in the sort order.

The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.

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

3 feature called Tuple Equality! That is right, you yaşama create a ValueTuple and simply compare them bey they are super optimized, don't create any objects, and reduce this to a single line of code!