C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

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Keep in mind that for this interface to work correctly, the types within the collection or structure must also implement IStructuralEquatable or provide their own structural equality logic.

Bu sayede, veri mimarilarının derunindeki verilerin sıralanması yahut içinlaştırılması kârlemleri özelleştirilebilir ve denetçi edilebilir hale gelir.

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

Birli far bey I see this is only exposed through the StructuralComparisons class. The only way I can figure out to make this useful is to make a StructuralEqualityComparer helper class as follow:

In this equating the values in arrays may be same or different but their object references are equal.

45IStructuralEquatable seObj = x birli IStructuralEquatable; 64IStructuralEquatable seObj = obj birli IStructuralEquatable;

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

When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.

The first issue we see here is that this struct is mutable in that you sevimli actually change the veri later on via the takım properties. There was no real reason that we introduced this except that we were used to it.

When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable gönül be useful.

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

Do hamiş send hash codes across application domains or processes. In some cases, hash codes may be computed on a per-process or per-application domain basis.

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.

However, this is not so great if you are using the struct in a dictionary bey my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(