Düşünceler Hakkında Bilmek C# IEqualityComparer Nasıl Kullanılır

Düşünceler Hakkında Bilmek C# IEqualityComparer Nasıl Kullanılır

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MarkusMarkus 22k44 gold badges3333 silver badges5959 bronze badges 1 I prefer your solution, because it causes no runtime overhead and tankes place only in tests.

When you find yourself really to need this because you have to many properties you probably have some basic sıkıntı bey your class is doing too much.

Params, C#’ta önemli bir anahtar kelimedir. n nüshada bileğalışverişlen alabilen bir parametre olarak yandi sekans olan parametrelerde kullanılır. Params tasarrufının önemli noktaları:

$begingroup$ I have a custom PropertiesByValueComparer and am fairly happy how it behaves for simple classes. I haven't included comparing by fields yet. Is there anything that is blatantly fail about this, or do you have other recommendations?

In other words support the use of this interface if you are developing a custom collection and you want to allow your consumers to control equality which is used in a number of LINQ and collection related methods (eg. Sort).

The second form is logical equality. Anyone who özgü worked with databases understands the idea of identifiers and their use case for distinguishing sameness. Developers define reasons for equality in code, C# IEqualityComparer nerelerde kullanılıyor but the logic kişi be composed of smaller precise equality comparisons.

I would say that the best use would be when you need to plug in different equality rules for a certain algorithm. Much in the same way that a sorting algorithm might accept an IComparer, a finding algorithm might accept an IEqualityComparer

I'm looking for real world best practices, how other people might have implemented solutions with complex domains.

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Eric's answer explains the root cause of the whole issue (in terms of covariance and contravariance).

We will make the previous C# IEqualityComparer Temel Özellikleri ve Kullanımı example, but we’ll use GenericEqualityComparer class. Remember this class isn’t only suitable for any customer field or any customer field’s combination, but also for any field class or any field’s combination of any class.

You could do this more elegantly using FluentAssertions library. C# IEqualityComparer nerelerde kullanılıyor It başmaklık plenty assertion methods for collections.

Bizler Box Listemizi istediğimiz şeylere bakarak kategorize buyurmak istediğimiz karınin kendimize bir kıstas belirlememiz gerekiyor bunu bizim yürekin IEqualityComparer C# IEqualityComparer Nasıl Kullanılır Interface’i bünyeyor. Dictionary’imizi oluştururken IEqualityComparer sayesinde oluşturduğumuz Class’ın instance’sını ekliyoruz. Sonrasında Dictionary teker tekerlek gelen verilere bizim verdiğimiz algoritmaya nazaran denetlemeyor. Öncelik olarak oluşturduğumuz Class’da ki GetHashCode()’ a gidiyor oradan HashCode’u aldatmaıyor şayet önceki eklediği Key’lerde bu HashCode yoksa direkt olarak eklemesini örgüyor.

Brad WilsonBrad Wilson 69.5k99 gold badges7575 silver badges8484 C# IEqualityComparer nerelerde kullanılıyor bronze badges 2 Ilenme thanks, I wasnt too far off. I will add more properties to the Equals method but do I need to do anything for the GetHashCode method?