C# IStructuralEquatable Kullanımı Üzerinde Buzz söylenti

C# IStructuralEquatable Kullanımı Üzerinde Buzz söylenti

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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.

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If you want to implement IEquatable in a class hierarchy you dirilik use the following pattern. It prevents derived (including sibling) classes from being equal.

Yazgımızın mafevkdaki satırlarında da bahsettiğimiz üzere struct C#’ta value type yaratabileceğimiz gestaltdır.

This code technically works, but is sort of a hot mess and is not really maintainable. Anyone using the library would have to write this code kakım well. The next logical step would be to just use .Equals on the entire metrics.

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

After some more testing I found that any two arrays with the same first element have the same hash. I still think this is strange behavior.

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...

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 hamiş give you the correct results in this super simple example:

Task oluşturmanın işlemlemci üzerinde maliyeti vardır ve çok gücük süren aksiyonlemler kucakin bir task yapılandırmak genel anlamda elan yavaş çkızılışan uygulamalara sebep evet.

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Bu yapıya derece oluşturduğumuz bütün nesnelerin Heap kısmında olduğunu söylemiştik. Halbuki Stack kısmında struct gestaltsında nesneleri tutabilmekteyiz.

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

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