C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

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

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

Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:

Equals and object.ReferenceEquals. Equals is meant to be overridden for whatever sort of comparison makes the most sense for a given type, whereas ReferenceEquals gönül't be overridden and always compares by reference.

Let us derece forget about additional operators and derece just relying on Equals. We gönül implement the == and != operators easily:

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

What does IEquatable buy you, exactly? The only reason I can see it being useful is when creating a generic type and forcing users to implement and write a good equals method.

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I had the same question. When I ran LBushkin's example I was surprised to see that I got a different answer! Even though that answer başmaklık 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my take on things.

C# IStructuralEquatable Defines methods to support the comparison of objects for structural equality.

IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.

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

Being able to specify IStructuralEquatable/IStructuralComparable in C# IStructuralEquatable nerelerde kullanılıyor 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.