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.
In certain scenarios (such kakım using the value type birli a key in a dictionary) it yaşama murder performance in one foul swoop.
If you want to implement IEquatable in a class hierarchy you sevimli use the following pattern. It prevents derived (including sibling) classes from being equal.
LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why emanet't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?
Bildiğiniz üzere new işletmenü classlarda kullanıldığı hengâm dayalı classtan bir nesne dilek edilmekte ve üretilen nesne belleğin Heap kısmında saklama edilmektedir.
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 as an argument to the Equals method, you kişi define a custom equality comparison for the array or collection.
What does IEquatable buy you, exactly? The only reason I gönül see it being useful is when creating a C# IStructuralEquatable nedir generic type and forcing users to implement and write a good equals method.
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.
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When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable can be useful.
Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda sahip olduğundan, CompareTo metodu farklı bir ölçü döndürür ve bu dizilerin strüktürel olarak eşit olmadığını belirtir.
Bu strüktürya kadar oluşturduğumuz bütün 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.
The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.