C# IStructuralEquatable Temel Özellikleri - Genel Bakış

C# IStructuralEquatable Temel Özellikleri - Genel Bakış

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The individual calls to IEqualityComparer.Equals end and the IStructuralEquatable.Equals method returns a value either when a method call returns false or after all array elements or tuple components have been compared.

= 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.

The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.

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.

Let us hamiş forget about additional operators and not just relying on Equals. We can implement the == and != operators easily:

The following example defines a NanComparer class that implements the IStructuralEquatable interface. 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.

After some more testing C# IStructuralEquatable Nasıl kullanılır I found that any two arrays 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...

Projeyi yayınladıgınız hengâm user secrets kullanılmıyor. Bu sadece ihya aşamasında kullanılabilir.

Bir önceki konulemin aynısını AsOrdered extensionı ile gestaltldığında işlem tekrar paralel olarak bünyelır, fakat özlar sıralı olur.

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Bu kuruluşya kadar oluşturduğumuz tüm nesnelerin Heap kısmında bulunduğunu söylemiştik. Halbuki Stack kısmında struct kuruluşsında nesneleri tutabilmekteyiz.

Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.

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