C# IEqualityComparer Temel Özellikleri ve Kullanımı Herkes İçin Eğlenceli Olabilir

C# IEqualityComparer Temel Özellikleri ve Kullanımı Herkes İçin Eğlenceli Olabilir

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1 Writing code without knowing what it actually does is called cargo cult programming. It’s a surprisingly widespread practice. It fundamentally doesn’t work.

This way, you hayat implement a sınav that fails if any properties are added. Of course, you'd have to add new properties to the array at the beginning. Kakım using reflection is an expensive operation from a performance point of view, I'd propose to use it in the test, derece in the comparer itself if you need to compare lots of objects.

1 Foo should be immutable if you intend to use it birli key in hash tables. An in that case new properties needs to be seki using the ctor's paramsters, and anyone doing so would see that your test for the Comparer no longer compiles.

Özellikle Dictionary, HashSet üzere bilgi konstrüksiyonlarıyla beraberinde kullanılarak özelleştirilmiş karşılaştırmalar katkısızlar. Sonunda, farklı veri tipleri veya kompozitşık mukabillaştırma kuralları mucip durumlarda kullanıcıya elastikiyet sağlar.

Protected: Muayene, yalnızca türetilen sınıflar yahut aynı derlemedeki sınıflar aracılığıyla erişilebilir hale gelir. Bu durumda, kontrolün erişimi belirlidır ve salt belirli sınıflar aracılığıyla erişilebilir.

Photo by Moosa Haleem Equality might seem straightforward, but it tends to get fuzzier the longer you think about it. When it comes to programming, there are two general thoughts around equality.

I have a number of classes that derive from C# IEqualityComparer Nasıl Kullanılır a class BaseClass where BaseClass just saf an `Id property.

If you look at the definition of Distinct there is only one generic type parameter involved (and hamiş one TCollection used for input and output collections and one TComparison for the comparer).

You have discovered C# IEqualityComparer Nasıl Kullanılır an unfortunate edge case in the generic method type inference algorithm. We have:

What would you expect the type of positions to be? As compiler deduces from argument given to Distinct which implements IEqualityComparer, the C# IEqualityComparer nerelerde kullanılıyor type of the expression is IEnumerable.

Ya o yardımcı Description attribute bizim huzurmıza çıkar. Bu attribute ile hangi enum elamanının niçin var olduğunu , ne midein C# IEqualityComparer Kullanımı bu bileğere iye bulunduğunu görgüsüzçe tanımlayabiliriz ve bu description’a erişebiliriz.

One feature I wish .Safi had which would improve the usefulness of such dictionaries would be a means of requesting the actual key object associated with a given key (so if the dictionary contained the string "WowZo" as a key, one could look up "wowzo" and get "WowZo"; unfortunately, the only way to retrieve an actual key object, if C# IEqualityComparer nedir TValue doesn't contain a redundant reference to it, is to enumerate the entire collection).

No property will be added at runtime. I only want to ensure that nobody modify this class without make some sınav red. We are hundreds in the team and some guy could modify the class without notice side effects.

When implementing interfaces of classes it is important to read the documentation, to know which contract you’re supposed to implement.1