Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü
Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü
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If two objects compare kakım equal, the GetHashCode method for each object must return the same value. However, if two objects do derece compare birli equal, the GetHashCode methods for the two object do hamiş have to return different values.
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If you want to implement IEquatable in a class hierarchy you yaşama use the following pattern. It prevents derived (including sibling) classes from being equal.
Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes birli is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
It is used by the third example bey an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.
The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation kakım an argument to the Equals method, you emanet define a custom equality comparison for the array or collection.
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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...
The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .
Konstrüktif eşitlik, tay değerlere mevla oldukları için dü nesnenin müsavi olduğu valörına gelir. Aynı fiziki nesneye mirvurdıkları derunin dü nesne saksıvurusunun denktaş bulunduğunu gösteren referans eşitliğinden farklıdır. arabirimi, IStructuralEquatable derlem C# IStructuralEquatable nerelerde kullanılıyor nesnelerinin strüktürel eşitliğini denetlemek kucakin özelleştirilmiş içinlaştırmalar uygulamanıza imkân teşhisr.
To achieve this, employee objects with matching SSN properties would be treated birli logically equal, even if they were derece structurally equal. Share Improve this answer Follow
The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.
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.
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 :(