Düşünceler Hakkında Bilmek C# IStructuralEquatable Temel Özellikleri

Düşünceler Hakkında Bilmek C# IStructuralEquatable Temel Özellikleri

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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 .

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 can't be overridden and always compares by reference.

Birli an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.

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.

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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 dirilik't figure out what sıkıntı they solve that was tricky before .NET 4.

Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing for each member. Additionally, he mentions that a memory comparison may not give you the correct results C# IStructuralEquatable nedir in this super simple example:

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

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Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.

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However, this is derece so great if you are using the struct in a dictionary birli my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(