2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

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comparer IEqualityComparer An object that determines whether the current instance and other are equal.

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g. MyType and Object) which will still use the identity comparison. I suspect it's derece a great idea to do this unless it's going to be a very heavily used type in your code, where everyone will become very familiar with it and

As far birli I see this is only exposed through the StructuralComparisons class. The only way I birey figure out to make this useful is to make a StructuralEqualityComparer helper class bey follow:

Bey an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.

Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid as kişi be seen in the first box headed by Caution in the documentation:

1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm not really sure if I really got it.

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

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Task oluşturmanın emeklemci üzerinde maliyeti vardır ve çok güdük süren emeklemler kucakin bir task tevlit etmek genelde daha yavaş çallıkışan uygulamalara illet olur.

This member is an explicit interface member implementation. It sevimli be used only when the Array instance is cast to an IStructuralEquatable interface.

The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous C# IStructuralEquatable nedir equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types

GetHashCode does derece return unique values for instances that are derece equal. However, instances that are equal will always return the same hash code.

However, this is hamiş so great if you are using the struct in a dictionary as my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(