Greatest Kılavuzu C# IStructuralEquatable Nasıl kullanılır için

Greatest Kılavuzu C# IStructuralEquatable Nasıl kullanılır için

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The individual calls to IEqualityComparer.Equals end and the IStructuralEquatable.Equals method returns a value either when a method call returns false or after all array elements or tuple components have been compared.

In certain scenarios (such kakım using the value type as a key in a dictionary) it emanet murder performance in one foul swoop.

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

You generic method saf a type parameter T but the type is derece part of the signature of the function so how is T supposed to be used in the function? Anyway, you hayat use .Kemiksiz tuples or anonymous types to create hash codes by combining values but I am hamiş sure this answers your question.

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

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

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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 saf 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my take on things.

This member is an explicit interface member implementation. It hayat be used only when the Array instance is cast to an IStructuralEquatable interface.

That is, you hayat create your own definition of structural equality and specify that this definition be used with a collection type that C# IStructuralEquatable nerelerde kullanılıyor accepts the IStructuralEquatable interface. The interface katışıksız two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

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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 not mutually exclusive.