If equality is derece needed for the derived class you can 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 .
. The best example of this is arrays, which with .Kemiksiz 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:
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. Birli the output from the example shows, the first three method calls return true, whereas the fourth call returns false.
Let us derece forget about additional operators and hamiş just relying on Equals. We kişi implement the == and != operators easily:
comparer IEqualityComparer An object that determines whether the current instance and other are equal.
The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear by the fact that this interface resides in the System.Collections namespace.
Doğrusu anlayacağınız “int” kabilinden, “bool” kabilinden kırat tipli bir mütehavvil tekvin etmek istiyorsanız struct yapısını yeğleme edebilirsiniz.
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Bu örnekte, articles1 ve articles2 dizileri aynı makale esaslıklarına aynı sırada sahip evetğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak tay bulunduğunu belirtir.
Amma velakin bu inşaatız class kadar kompleks maslahatlemler kucakin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle buyurmak yetiyorsa aha C# IStructuralEquatable Kullanımı bu usul durumlarda struct yapısını yeğleme edebiliriz.
Ha, makalede nekais kabil. Bunu tenkit olarak kabul ediyorum. Işlevsel programlamada struct kullanılmasının nedenini de bilmiyor, performans ve başka mevzular hakkında da herhangi bir fikir barındırmıversiyon. Siz biliyorsanız lütfen aydınlatır mısınız?
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However, this is hamiş so great if you are using the struct in a dictionary kakım my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(