Definitive Guide C# IEqualityComparer Temel Özellikleri ve Kullanımı için

Definitive Guide C# IEqualityComparer Temel Özellikleri ve Kullanımı için

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Enum teşhismlarken eğer herhangi bir eder verilmezse defaul olarak 0 dan temellayarak kıymetiharbiye vermeye başlar . Burada

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

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Furthermore, it is very easy to make the class generic so that it gönül be used for collections of objects of other types - derece only for MovieActors. The complete code for this example is available through github. (There is also a generic version of our comparer.)

GetValueProperties is implemented bey a (single-line) method; to fetch the "class properties" you use the lambda expression inline; the code should be consistent (either do both Where expressions inline, or both bey helper methods)

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

Bu özellik, mânialı kullanıcılar bâtınin görüntülük türkücü yazılı sınavmlar yahut vesair yardımcı teknolojiler tarafından kullanılabilir.

We’ll write a classic C# IEqualityComparer nedir implementation of IEqualityComparer class. In our example, we need to compare customers. Two customers are distinct if your first char Name is different.

EDIT2: Kakım mentioned in the comments doing reflection within Equals or even GetHashCode is a bad idea C# IEqualityComparer nerelerde kullanılıyor bey it´s usually quite slow and kişi often be avoided. If you know the properties to be checked for eqality at compile-time you should definitly include them within those two methods kakım C# IEqualityComparer Nasıl Kullanılır doing so gives you much more safety.

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

SnowbearSnowbear 3,66311 gold badge1919 silver badges2323 bronze badges $endgroup$ 2 $begingroup$ If I'm hamiş mistaken, the GetHashCode() function normally C# IEqualityComparer nedir takes the object's memory address into it's calculation. I'll have to do some more reading up on that. $endgroup$

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It looks like you're forgetting the immutable nature of IEnumerable. None of the LINQ methods actually change the original variable.

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.