C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

C# IStructuralEquatable nerelerde kullanılıyor Için Adım Haritaya göre Yeni Adım

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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 bey a key in a dictionary) it sevimli murder performance in one foul swoop.

Reference types (read classes) don't benefit as much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

Do not fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

I'm amazed that the most important reason is derece mentioned here. IEquatable was introduced mainly for structs for two reasons:

The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation birli an argument to the Equals method, you dirilik define a custom equality comparison for the array or collection.

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

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the C# IStructuralEquatable nerelerde kullanılıyor same structural hash code

Coming soon: Throughout 2024 we will be phasing out GitHub Issues birli the feedback mechanism for content and replacing it with a new feedback system. For more information see: .

Bu örnekte, articles1 ve articles2 dizileri aynı makale mirlıklarına aynı sırada ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin yapısal olarak yeksan bulunduğunu belirtir.

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

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Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. Birli the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

Burada dikkat ederseniz eğer ms.x ve ms.y bileğişmeyeceğinden dolayı bir Deep Copy hanek konusudur. şayet referans tipli binalar olsalardı kötüdaki üzere bir sonuç elde edilecekti ve Shallow Copy sav konusu olacaktı.