En iyi Tarafı C# IStructuralEquatable nerelerde kullanılıyor

En iyi Tarafı 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.

In certain scenarios (such bey using the value type bey a key in a dictionary) it güç murder performance in one foul swoop.

Reference types (read classes) don't benefit bey 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.

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. Bey the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

This code technically works, but is sort of a hot mess and is derece really maintainable. Anyone using the library would have to write this code birli well. The next logical step would be to just use .Equals on the entire metrics.

Structural equality means that two objects are equal because they have equal values. It differs from reference equality, which indicates that two object references are equal because they reference the same physical object. The IStructuralEquatable interface enables you to implement customized comparisons to check for C# IStructuralEquatable Nasıl kullanılır the structural equality of collection objects.

If those objects do hamiş contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.

Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

(doesn't violate documentation), but it is clearly not birli good kakım it would be if 0 were replaced with i. Also there's no reason to loop if the code were just going to use a single value from the array.

Yapısal müsavat, müsavi değerlere malik oldukları muhtevain iki nesnenin yeksan başüstüneğu demeına hasılat. Aynı fiziksel nesneye servurdıkları muhtevain iki nesne servurusunun hemayar bulunduğunu gösteren başvuru eşitliğinden değişikdır. arabirimi, IStructuralEquatable koleksiyon nesnelerinin konstrüktif eşitliğini denetlemek bâtınin özelleştirilmiş önlaştırmalar uygulamanıza olanak tanır.

To achieve this, employee objects with matching SSN properties would be treated as logically equal, even if they were hamiş 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.

Here the comparison is different for value type arrays and custom arrays. In .Net 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.

Burada dikkat ederseniz şayet ms.x ve ms.y değsorunmeyeceğinden dolayı bir Deep Copy alay konusudur. Eğer referans tipli binalar olsalardı zirdaki kadar bir sonuç elde edilecekti ve Shallow Copy güfte konusu olacaktı.