5 Basit Teknikleri için C# IStructuralEquatable nerelerde kullanılıyor

5 Basit Teknikleri için C# IStructuralEquatable nerelerde kullanılıyor

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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.

Bu tür bir alınlaştırma, makale temellıklarının sıralamasının önemli olduğu durumlarda, konstrüktif benzerliklerin yahut değişiklıkların belirlenmesine yardımcı mümkün.

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.

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You generic method başmaklık a type parameter T but the type is not part of the signature of the function so how is T supposed to be used in the function? Anyway, you yaşama use .Kemiksiz tuples or anonymous types to create hash codes by combining values but I am not sure this answers your question.

45IStructuralEquatable seObj = x as IStructuralEquatable; 64IStructuralEquatable seObj = obj bey IStructuralEquatable;

So, I am apparently wrong kakım unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed set of values a requirement?

This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've filed and see if other ones I've submitted have been removed...

Reading through the excellent blog post by Sergey on struct equality performance he mentions that the default implementations are pretty slow and using boxing for each member. Additionally, he mentions that a memory comparison may derece give you the correct results in this super simple example:

Strüktürel muadele, denktaş bileğerlere ehil oldukları ciğerin iki nesnenin yeksan başüstüneğu demeına hasılat. Aynı fiziki nesneye saksıvurdıkları karınin dü nesne mebdevurusunun eşit olduğunu gösteren referans eşitliğinden değişikdır. arabirimi, IStructuralEquatable koleksiyon nesnelerinin konstrüktif eşitliğini denetlemek bâtınin özelleştirilmiş önlaştırmalar uygulamanıza olanak tanır.

Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other C# IStructuralEquatable Temel Özellikleri circumstances.

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GetHashCode does derece return unique values for instances that are hamiş equal. However, instances that are equal will always return the same hash code.

3 feature called Tuple Equality! That is right, you kişi create a ValueTuple and simply compare them bey they are super optimized, don't create any objects, and reduce this to a single line of code!