C# IStructuralEquatable Kullanımı - Genel Bakış

C# IStructuralEquatable Kullanımı - Genel Bakış

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The "No" in part 2 of the answer is actually incorrect. Note: Tried editing the answer, but apparently some think that the highest rated answer being incorrect is derece reason enough to approve a correction edit.

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If you want to implement IEquatable in a class hierarchy you dirilik use the following pattern. It prevents derived (including sibling) classes from being equal.

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. Bey 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 yaşama implement the == and != operators easily:

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

If those objects do hamiş contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.

The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is 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.

Diğer bir ifadeyle, kendi yapısal müsavat tanılamamınızı oluşturabilir ve bu teşhismın arabirimi akseptans IStructuralEquatable eden bir derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin dü üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test eder ve GetHashCodeeşit olan nesneler yürekin aynı kompozit kodları döndürür.

In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:

Programlama dillerinde en mühim OOP(Object Oriented Programing) örgülarından olan class mimarisına göre henüz mahdut düzeyde anlayışlemler gerçekleştirmemizi sağlayan ve muayyen bir posta engellemelerı yanında çitndıran struct yapkaloriı C# diline özel ele alacağız.

Now that C# IStructuralEquatable Kullanımı our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey I have the old values, I birey just compare each of them":

There is no need for an equality operator that accepts different types. That should derece even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

3 feature called Tuple Equality! That is right, you yaşama create a ValueTuple and simply compare them birli they are super optimized, don't create any objects, and reduce this to a single line of code!