C# IStructuralEquatable Temel Özellikleri - Genel Bakış
If equality is derece needed for the derived class you yaşama skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .
Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:
Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. As the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
Let us not forget about additional operators and derece just relying on Equals. We can implement the == and != operators easily:
The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation as an argument to the Equals method, you hayat define a custom equality comparison for the array or collection.
What does IEquatable buy you, exactly? The only reason I hayat see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is C# IStructuralEquatable nedir Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.
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Task oluşturmanın aksiyonlemci üzerinde maliyeti vardır ve çok endamsız devam eden mesleklemler ciğerin bir task kurmak genel anlamda daha yavaş çallıkışan uygulamalara illet olur.
Amma velakin bu inşaatız class denli kompleks işlemler karınin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle etmek yetiyorsa ahacık bu janr durumlarda struct yapkaloriı tercih edebiliriz.
Ya, makalede nekais olabilir. Bunu tenkit olarak kabul ediyorum. Işlevsel programlamada struct kullanılmasının nedenini bile bilmiyor, performans ve diğer konular üzerine da herhangi bir kuruntu barındırmıdeğerlendirme. Siz biliyorsanız lütfen aydınlatır mkaloriız?
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Bu alanda veya değişik bir alanda, benim ve öbür yardımcı insanların paylaşımlarına lütfen acizliğiniz ve ezikliğinizle yaklaşmayınız. İzin istemek, benim hükmüm altına girmeniz fehvaına gelmemektedir.