Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?

1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .

. The best example of this is arrays, which with .NET 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:

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

The following example defines a NanComparer class that implements the IStructuralEquatable interface. 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.

1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm hamiş really sure if I really got it.

I've noticed these two interfaces, and several associated classes, have been added in .Safi 4. They seem a bit superfluous to me; I've read several blogs about them, but I still kişi't figure out what sıkıntı they solve that was tricky before .NET 4.

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

That is, you güç create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface has 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.

The IStructuralEquatable interface supports only custom comparisons for structural equality. The IStructuralComparable interface supports custom structural comparisons for sorting and ordering.

While writing my own immutable ByteArray C# IStructuralEquatable Nasıl kullanılır class that uses a byte array internally, I implemented the IStructuralEquatable interface.