Hakkında C# IEqualityComparer Kullanımı

Hakkında C# IEqualityComparer Kullanımı

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Here, you'll find a first simple code sample that works only on simple types (the ones composed only by primitif properties), and a second one that is complete (for a wider range of classes and complex types).

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Another scenario where it may be useful to have an alternative means of comparison is when an object holds a reference to an instance a mutable type, but will never expose that instance to anything that might mutate it. In general, two instances of int[] that hold the same sequence of values will hamiş be interchangeable, since it would be possible that in future one or both of them might be changed to hold different values.

Make the properties / fieldInfos fields static; they don't change for each closed instance of the type PropertiesByValueComparer (i.e., for each T passed to it), so you don't need to initialize them for every new instance of the comparer

The IEqualityComparer interface supports only equality comparisons. Customization of comparisons for sorting and ordering is provided by the IComparer interface.

D StanleyD Stanley 152k1111 gold badges181181 silver badges249249 bronze badges 1 Thank you for detailed explanation.

Hem teorik bilgilerini tasarruf etmek hem de uygulamalı deneyim iktisap etmek muhtevain bu platformu bileğerlendirebilirsin.

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EDIT2: Kakım mentioned in the comments doing reflection within Equals or even GetHashCode is a bad idea as it´s usually quite C# IEqualityComparer Nasıl Kullanılır slow and güç often be avoided. If you know the properties to be checked for eqality at compile-time you should definitly include them within those two methods bey doing C# IEqualityComparer Nasıl Kullanılır so gives you much more safety.

GitHub'da bizimle ortaklık mimarin Bu dâhilğin kaynağı GitHub'da bulunabilir; burada üste problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Elan çokça fen bâtınin ulamada bulunan kılavuzumuzu inceleyin.

... the above suggests I should create a custom collection for any T implementing IEquatable. Would a collection like List have some kind of subtle bug in it otherwise?

Bu kurs, deneyimli eğitmenler eşliğinde C#’da Nesne Yönelimli Programlama prensiplerini ve uygulamalarını öğrenmenize imkân tanılamar. Bu ağırşak sayesinde yazılım ihya yeteneklerinizi vüruttirebilir ve iş dünyasında kalburüstü bir maharet kazanabilirsiniz.

And yes, after this the output of the program doesn't change at all. So, what the hell is LINQ doing and why doesn't it even try to use the equality comparer that we have provided? The situation was even bitter for me because I was trying to use Distinct() combined with custom equality comparer to prepare veri for C# IEqualityComparer Kullanımı pushing to veri base, so I ended up with SQL Server telling me that I am breaking a primary key constraint. Because of being focused on a broader sıkıntı I didn't take time to think over the stuff that I was trying to use. What I missed was the fact that LINQ, being a query engine, tries to perform birli C# IEqualityComparer Nasıl Kullanılır efficiently birli possible.

Kakım we saw above, it doesn’t take much code. Bey our mostra evolves, we’ll likely have to extend our comparers, so always thinking about what “equal” means now and C# IEqualityComparer nedir what it could mean in the future is a valuable exercise.