C# IEqualityComparer Temel Özellikleri ve Kullanımı Üzerinde Buzz söylenti

C# IEqualityComparer Temel Özellikleri ve Kullanımı Üzerinde Buzz söylenti

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Enum teşhismlarken şayet herhangi bir kıymet verilmezse defaul olarak 0 dan mirlayarak paha vermeye başlar . Burada

GitHub'da bizimle ortaklık gestaltn Bu içeriğin kaynağı GitHub'da bulunabilir; burada hatta problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Henüz ziyade selen muhtevain yardımda bulunan kılavuzumuzu inceleyin.

That means that your BaseClassComparer constrains the result type to base class and the conversion at the assignment is not possible.

Make the properties / fieldInfos fields static; they don't change for each closed instance of the type PropertiesByValueComparer (i.e., for each T passed to it), so you don't need to initialize them for every new instance of the comparer

In other words support the use of this interface if you are developing a custom collection and you want to allow your consumers to control equality which is used in a number of LINQ and collection related methods (eg. Sort).

Scroll down to the part on KeyEqualityComparer and especially the part on the importance of GetHashCode. There is a whole discussion on why obj.GetHashCode(); (kakım suggested by DMenT's post) is wrong and should just return 0 instead.

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Fields yaşama be null — appears if there are any nullable fields or properties in your type. By default, this checkbox is selected, meaning that ReSharper will generate null checks for selected fields. You birey clear this checkbox if you do derece need null checks.

You will need some properties that will allways be available on C# IEqualityComparer Temel Özellikleri ve Kullanımı your type and that provide a good enough idea of what might be considered equal. All theadditional properties however should only go into the C# IEqualityComparer Nasıl Kullanılır expensive Equals-method.

Daha bir araba bilim midein Microsoft Learn’daki “C# 12'bile Neler Yeni” sayfasına ve Roslyn Özellik Durumu sayfasına hane atabilirsiniz. Siz de bu teceddütçi özellikleri deneyerek mukayyetm ihya deneyiminizi geliştirebilirsiniz.

1 @Boiethios Then you C# IEqualityComparer nedir might introduce some dirty-flag that determinaes if your object was modified istead of constantly checking all properties if they are still same kakım what you have in the database.

It looks like the C# IEqualityComparer Kullanımı generic version of this interface performs the same function but is used for Dictionary) collections.

Typically I'd write MyCustomeComparer which implements IEqualityComparer and pass a MyCustomeComparer object around to whichever objects that C# IEqualityComparer nerelerde kullanılıyor need it - I'm sure you're aware of this usage.

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