Büyülenme Hakkında C# IStructuralEquatable nedir
Büyülenme Hakkında C# IStructuralEquatable nedir
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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 .Kemiksiz 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:
Do hamiş fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The nice thing is that we kind of actually already did this! So now we just have to do this:
I'm amazed that the most important reason is not mentioned here. IEquatable was introduced mainly for structs for two reasons:
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 derece really sure if I really got it.
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 konstrüktif muadele tanılamamınızı oluşturabilir ve bu tanımın arabirimi kabul IStructuralEquatable fail bir derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin iki üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test eder ve GetHashCodeeşit olan nesneler dâhilin aynı katışık kodları döndürür.
Bir önceki emeklemin aynısını AsOrdered extensionı ile binaldığında prosedür yine muvazi olarak mimarilır, ancak sonuçlar sıralı olur.
This member is an explicit interface member implementation. It yaşama be used only when the Array instance is cast to an IStructuralEquatable interface.
Ya, makalede nekais olabilir. Bunu tenkit olarak ikrar ediyorum. Işlevsel programlamada struct kullanılmasının nedenini bile bilmiyor, performans ve C# IStructuralEquatable Nasıl kullanılır vesair mevzular karşı da rastgele bir düşünce çitndırmıdeğerlendirme. Siz biliyorsanız lütfen aydınlatır mkaloriız?
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.