C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

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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.

If you want a generic solution that creates an IEqualityComparer for your class based on a property (which acts kakım a key) of that class have a look at this:

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 has similar functionality to the above mentioned .

Flag ile kullanımda takkadak ziyade enum kıymeti kullanarak farklı kombinasyon değeri ile bir çok ulaşılabilecek teşhism kümesi teşhismlanabilir.

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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.

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below, these sevimli be incorrect. His recommendation of implementing IEqualityComparer.Equals works as well. You birey also use override. These will all provide different functionality based on what you cast to. Here is a brief explanation:

More importantly, I have stepped into the trap of thinking that objects, which I use in my code, hayat be only partially relevant to me, while in case we do OOP every object must 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 solve my sıkıntı 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). C# IEqualityComparer nerelerde kullanılıyor To verify this we add a debug message to the method and observe several calls to it:

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

If there are no fields/properties in your type or you do hamiş select any of them, ReSharper, depending on your settings, throws new NotImplementedException(), returns default value, or puts code that will derece C# IEqualityComparer Kullanımı compile in the body of the generated methods. You hayat configure the settings on the Code Editing

According to this thinking, both types should implement IEquatable, because it doesn't seem likely that there are other meaningful ways of C# IEqualityComparer nedir doing an equality sınav.

(Making matters worse, there is a typo in the spec that says that "choose the more C# IEqualityComparer Kullanımı specific" is the right thing to do! This was the result of an editing error during the design process that has never been corrected. The compiler implements "choose the C# IEqualityComparer nedir more general". I've reminded Mads of the error and hopefully this will get fixed in the C# 5 spec.)

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