C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

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Burada enum kümesinde olmayan bir elemana erişmek isteriz. Runtime da hiç bir mesele gayrimümkün ve bizlere dijital değeri veya olması müstelzim numerik kıymeti döner , yanılma olduğunun farkına varmayız. Gine bile arama etmekte kâr var :)

If you need to support custom GetHashCode() functionality, use the alternative constructor to provide a lambda to do the alternative calculation:

Bey far as best practices around using this interface for your own purposes. I would say that the best practice would be to use it when you are deriving or implementing a class that saf similar functionality to the above mentioned .

Bir dahaki sefere yorum yaptığımda kullanılmak üzere girişimı, elektronik posta adresimi ve web kent adresimi bu tarayıcıya kaydet.

Bir dahaki sefere versiyon yaptığımda kullanılmak üzere girişimı, elektronik posta adresimi ve web site adresimi bu tarayıcıya kaydet.

I have a list of custom object where I am trying to remove duplicate records. I am seeing so many online articles which points towards IEqualityComparer(I've never used this before). Question is, when should I use it? I güç achieve same result by LINQ in one line code.

This meant that your client now needs to retrieve and then process a larger number of records, which will always be less efficient that performing the lookup on the database where the approprate indexes hayat be used.

 In the plain case, when we need to drop only exact duplicates, the simple Distinct() call will do. The simplest possible example is getting unique integers from a collection of numbers:

More importantly, I have stepped into the trap of thinking that objects, which I use in my code, gönül be only partially relevant to me, while in case we do OOP every object must C# IEqualityComparer Temel Özellikleri ve Kullanımı be considered in its entirety (things like SOLID help us with that.) This way, when implementing the IEqualityComparer interface I should have paid more attention to the presence of GetHashCode(..) method. This would C# IEqualityComparer nerelerde kullanılıyor solve my sorun at once, because it is this same method that LINQ uses when asked to extract distinct objects and perform other equality related operations (see Kaş operators in this article). To verify this we add a debug message to the method and observe C# IEqualityComparer Kullanımı several calls to it:

GitHub'da bizimle ortaklaşa iş mimarin Bu derunğin kaynağı GitHub'da bulunabilir; burada hatta sorunları ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Daha ziyade olgun bağırsakin ulamada mevcut kılavuzumuzu inceleyin.

Beli o yardımcı Description C# IEqualityComparer Temel Özellikleri ve Kullanımı attribute bizim içinmıza çıkar. Bu attribute ile hangi enum elamanının neden var bulunduğunu , ne karınin bu değere sahip bulunduğunu çarpık çurpukçe tanılamamlayabiliriz ve bu description’a erişebiliriz.

However, quite frequently we, C# programmers, use classes and want to get rid of duplicated objects in a collection the same way. Suppose, we do something with actors of a movie:

And yes, after this the output of the yetişek 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 data for pushing to data 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 sorun 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 C# IEqualityComparer nedir query engine, tries to perform bey efficiently birli possible.

Doing that you changed the behavior for a single class, what if you need the same logic for other classes? If you need a "generic comparison". That is why you have IEqualityComparer.