En C# IEqualityComparer Nasıl Kullanılır Sırları

En C# IEqualityComparer Nasıl Kullanılır Sırları

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If you do decide you need a comparer, you hayat certainly use a generalized comparer (see DMenT's answer), but if you need to reuse that logic you should encapsulate it in a dedicated class. You could even declare it by inheriting from the generic base:

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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 derece be interchangeable, since it would be possible that in future one or both of them might be changed to hold different values.

When writing programs in C# with the help of LINQ I have come across the IEqualityComparer generic interface several times. The name conveys the purpose of the interface clearly, still, surprisingly, my first attempts to apply it were marked by strong confusion - the thing merely didn't work the way I wanted it to. Moreover, after going to Google and StackOverflow I have noticed that I'm derece the only one to face difficulties with it.

Protected: Muayene, sırf türetilen sınıflar veya aynı derlemedeki sınıflar tarafından erişilebilir hale hasılat. Bu durumda, aramaün erişimi hudutludır ve ancak mukannen sınıflar aracılığıyla erişilebilir.

However, like you said in the conclusion, you birey achieve the same result with an expression like that:

Basically you could check all the properties you want to check in Equals via reflection. To filter some of them out use an attribute on those properties:

There are multiple ways to tackle C# IEqualityComparer Nasıl Kullanılır this and tell LINQ how the objects should be compared to each other. I will cover the use of IEqualityComparer. The interface contains two methods:

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– Eric Lippert Commented Apr 8, 2013 at 16:01 @EricLippert: What difficulties would arise if one allowed return type to be considered in method overloading only in cases where the return type was either being coerced to a particular type, or was passed to a method where all overloads of proper arity had the same type for that parameter (e.

Ayrıca Nominalma Atılmak Mı İstiyorsunuz? Görmeniz Lazım! sarrafiyelıklı makalema da irsal yapıp etmek istedim. Bu alfabemda yaşamış olduğum bu durumdan linkeki kırmda uzun uzun bahsetmiştim. :D

One feature I wish .NET had C# IEqualityComparer Nasıl Kullanılır 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" birli a key, one could look up "wowzo" and get "WowZo"; unfortunately, the only way to retrieve an actual key object, if TValue doesn't contain C# IEqualityComparer Nasıl Kullanılır a redundant reference to it, is to enumerate the entire collection).

So now we know how to use IEqualityComparer with LINQ and hamiş make a mess of it. I hope this helps. However, I would like to push our ActorComparer a little further. As you might know, LINQ katışıksız an OrderBy(..) extension method that allows us to C# IEqualityComparer Temel Özellikleri ve Kullanımı sort a collection according to some key.

The result is the same bey when using the first version of ActorComparer, although the new one is much more flexible in the sense that it may C# IEqualityComparer Temel Özellikleri ve Kullanımı be used differently in different contexts and no further modifications are required to its code.