En iyi Tarafı C# IStructuralEquatable Nasıl kullanılır

En iyi Tarafı C# IStructuralEquatable Nasıl kullanılır

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That is, you yaşama create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface.

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Reference types (read classes) don't benefit kakım 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.

Bey far kakım I see this is only exposed through the StructuralComparisons class. The only way I kişi figure out to make this useful is to make a StructuralEqualityComparer helper class birli follow:

Although I think the gains from hamiş boxing will be less than the cost for having CanEqual. In that case you should seal your types and you no longer need CanEqual. Sealing also başmaklık some performance benefits.

Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.

The IEquatable implementation will require one less cast for these classes and bey a result will be slightly faster than the standard object.Equals method that would be used otherwise. Bey an example see the different implementation of the two methods:

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.

comparer IEqualityComparer İki nesnenin tay olup olmadığını kullanmak muhtevain kullanılacak yöntemi tanımlayan nesne.

Bu örnekte, articles1 ve articles2 dizileri aynı makale çıbanlıklarına aynı tam sahip başüstüneğundan, CompareTo metodu 0 döndürerek bu dizilerin konstrüktif olarak denktaş C# IStructuralEquatable Kullanımı bulunduğunu belirtir.

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The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types

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