C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

C# IStructuralEquatable nerelerde kullanılıyor Aptallar için

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That is, you güç create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface.

= 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 birli 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.

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 kakım is documented behavior, some reasoning and reflection would also lead you to the same conclusion.

In this equating the values in arrays may be same or different but their object references are equal.

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

The IEquatable implementation will require one less cast for these classes and kakım a result will be slightly faster C# IStructuralEquatable Nasıl kullanılır than the standard object.Equals method that would be used otherwise. Kakım an example see the different implementation of the two methods:

When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.

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 hamiş give you the correct results in this super simple example:

Task oluşturmanın işçiliklemci üzerinde maliyeti vardır ve çok kısaca devam eden medarımaişetlemler ciğerin bir task tesis etmek genel anlamda elan yavaş çallıkışan uygulamalara menşe olur.

To achieve this, employee objects with matching SSN properties would be treated kakım logically equal, even if they were hamiş structurally equal. Share Improve this answer Follow

That is, you emanet create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface başmaklık two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

You observations does derece conflict with the documentation and there is no bug in the implementation.

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