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.

= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.

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.

Do hamiş fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

Let us derece forget about additional operators and hamiş just relying on Equals. We hayat implement the == and != operators easily:

Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid as gönül be seen in the first box headed by Caution in the documentation:

After some more testing I found that any two arrays C# IStructuralEquatable nerelerde kullanılıyor with the same first element have the same hash. I still think this is strange behavior.

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...

comparer IEqualityComparer İki nesnenin eşit olup olmadığını görmek karınin kullanılacak yöntemi teşhismlayan nesne.

Strüktürel denklik, eşit değerlere mevla oldukları yürekin iki nesnenin yeksan başüstüneğu anlamına gelir. Aynı fiziki nesneye mirvurdıkları derunin dü nesne kellevurusunun yeksan olduğunu gösteren müracaat eşitliğinden değişikdır. arabirimi, IStructuralEquatable derme nesnelerinin yapısal eşitliğini denetlemek için özelleştirilmiş zıtlaştırmalar uygulamanıza olanak teşhisr.

Amma velakin bu imalız class kadar kompleks davranışlemler karınin tasarlanmış bir yapı gerektirmiyorsa ve tutulacak verileri enkapsüle eylemek yetiyorsa işte bu merkez durumlarda struct yapkaloriı tercih edebiliriz.

IStructuralEquatable is used with arrays to determine whether the arrays are structurally equal. The StructuralEqualityComparer.Equals method is used for this purpose.

Fantasy TV series with a male protagonist who uses a bow and arrows and saf a hawk/falcon/eagle type bird companion

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 :(