Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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Keep in mind that for this interface to work correctly, the types within the collection or structure must also implement IStructuralEquatable or provide their own structural equality logic.

1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .

g. MyType and Object) which will still use the identity comparison. I suspect it's not 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

Birli far kakım I see this is only exposed through the StructuralComparisons class. The only way I güç figure out to make this useful is to make a StructuralEqualityComparer helper class kakım follow:

This code technically works, but is sort of a hot mess and is hamiş really maintainable. Anyone using the library would have to write this code kakım 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 the structural equality of collection objects.

IStructuralEquatable is quite new and unknown, but I C# IStructuralEquatable Temel Özellikleri read somewhere that it güç be used to compare the contents of collections and arrays. Am I wrong, or is my .Safi wrong?

Consider that there are only ~4.2 billion different hashcodes. Yaşama you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller takım - there are bound to be duplicates.

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 not give you the correct results in this super simple example:

Task oluşturmanın medarımaişetlemci üzerinde maliyeti vardır ve çok kısaca süren davranışlemler muhtevain bir task peyda etmek genel anlamda daha yavaş çdüzenışan uygulamalara vesile evet.

Net on a certain ortam, I'm compelled to issue the standard warning not to rely on the values of hashcodes or how they are computed, since it is derece guaranteed to be the same across updates or platforms.

Do derece send hash codes across application domains or processes. In some cases, hash codes may be computed on a per-process or per-application domain basis.

GetHashCode does not return unique values for instances that are not equal. However, instances that are equal will always return the same hash code.

Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.