Hakkında C# IStructuralEquatable Temel Özellikleri

Hakkında C# IStructuralEquatable Temel Özellikleri

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Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

Reference types (read classes) don't benefit as much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.

Do hamiş fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

Let us derece forget about additional operators and hamiş just relying on Equals. We sevimli implement the == and != operators easily:

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm not really sure if I really got it.

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özge bir ifadeyle, kendi yapısal denklik tanımınızı oluşturabilir ve bu tanımın arabirimi akseptans IStructuralEquatable eden bir koleksiyon türüyle kullanılacağını belirtebilirsiniz. Arabirimin iki üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test eder ve GetHashCodeeşit olan nesneler derunin aynı kompozit kodları döndürür.

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

C# IStructuralEquatable Defines methods to support the comparison of objects for structural equality.

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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.

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