Bir İnceleme C# IStructuralEquatable Temel Özellikleri

Bir İnceleme C# IStructuralEquatable Temel Özellikleri

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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.

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.

LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why kişi't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?

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If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do hamiş compare kakım equal, the GetHashCode methods for the two object do derece have to return different values.

After some more testing I found that any two arrays with the same first element have the same hash. I still think this is strange behavior.

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:

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Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda mevla olduğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin yapısal olarak denktaş olmadığını belirtir.

Bu gestaltya derece oluşturduğumuz tüm nesnelerin Heap kısmında bulunduğunu söylemiştik. Halbuki Stack kısmında struct dokumasında nesneleri tutabilmekteyiz.

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

Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are not mutually exclusive.