Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler
Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler
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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.
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. The best example of this is arrays, which with .Kupkuru 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:
Does anyone know what happens if you do not implement iequtalable when using generic collections? 2
In this equating the values in arrays may be same or different but their object references are equal.
I never put much thought into using a struct over a class or even additional optimizations because to me the struct was optimized already. When I was working on fixing a bug in our DeviceDisplay to hamiş trigger new events unless a value changed a whole new world opened up to me.
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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 yeksan olup olmadığını değerlendirmek midein kullanılacak yöntemi tanımlayan nesne.
Bu örnekte, articles1 ve articles2 dizileri aynı makale mebdelıklarına aynı tam sahip başüstüneğundan, CompareTo metodu 0 döndürerek bu dizilerin strüktürel olarak denktaş olduğunu belirtir.
Amma velakin bu konstrüksiyonız class derece kompleks sorunlemler derunin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle kılmak yetiyorsa aha bu ezgi durumlarda struct yapısını yeğleme edebiliriz.
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
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.
Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are hamiş mutually exclusive.