En Kuralları Of C# IEqualityComparer Kullanımı

En Kuralları Of C# IEqualityComparer Kullanımı

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The last statement basically means that in case we rely on Equals(..) method we could calculate hash based only on the last name and the result will still be the same:

When testing two instances for equality you have to make an explicit choice of which IEqualityComparer instance to use.

The same return value system applies bey IComparer. The difference between this and IComparer is IComparable will be implemented on the class that contains your field values, while IComparable derived classes are used for custom sorting. So for example:

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.

Burada Buffer10 isminde bir yapı (struct) kullanılarak inline bir saf oluşturuyoruz. Bu yapı, InlineArrayAttribute ile meslekaretlenmiştir ve 10 elemanlı bir dizi temaşa paha. İlk 10 adetnın karesini hesaplayarak ve yazdırarak bu inline diziyi kullanıyoruz.

Therefore, when testing two instances of T for equality, because T özgü no internal understanding of equality, you will have to make an C# IEqualityComparer Nasıl Kullanılır explicit choice of a IEqualityComparer instance which performs the test according to your specific requirements.

It is essentially the same for this purpose with one subtle difference. In your first example you override Equals using a parameter of type Object and then have to cast it to Customer, however, in your second example you are able to have the parameter of type Customer which means there is no need to C# IEqualityComparer nedir cast.

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

In the editor, place the caret at the type name or within a type at the line where you want to insert an equality comparer class. If the caret is on the type name, the generated code will be added in the beginning of the type declaration.

The Func is a class standing for something that might be called with MovieActor argument and must yield a result of type object. Although generally I don't like dealing with pure object's in my code, this is a valid way to define a C# IEqualityComparer Kullanımı key selector derece bounding it to some specific key type.

... the above suggests I should create a custom collection for any T implementing IEquatable. Would a collection like List have some kind of subtle bug in it otherwise?

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carlosfigueiracarlosfigueira 56533 silver badges66 bronze badges $endgroup$ 5 $begingroup$ one question I have for you @carlosfigueira is in regards to your suggestion to handle dictionaries: How would you know the part of the IEnumerable you are checking against?

Kakım we saw above, it doesn’t take much code. Bey our sistem evolves, we’ll likely have C# IEqualityComparer Kullanımı to extend our comparers, so always thinking about what “equal” means now and what it could mean in the future is a valuable exercise.