Hakkında herşey C# IStructuralEquatable Temel Özellikleri
Wiki Article
Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.
= 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.
Equals and object.ReferenceEquals. Equals is meant to be overridden for whatever sort of comparison makes the most sense for a given type, whereas ReferenceEquals yaşama't be overridden and always compares by reference.
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The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects.
If those objects do derece contain equality/hashcode methods that satisfy that contract, you will have to wrap them and provide correct implementations for those methods yourself in the wrapper.
I've noticed these two interfaces, and several associated classes, have been added in .Kemiksiz 4. They seem a bit superfluous to me; I've read several blogs about them, but I still kişi't figure out what problem they solve that was tricky before .NET 4.
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 derece give you the correct results in this super simple example:
Task oluşturmanın işlemlemci üzerinde maliyeti vardır ve çok kısaca devam eden konulemler sinein bir task peydahlamak genelde elan yavaş çalışan uygulamalara saika olur.
Kupkuru on a certain platform, I'm compelled to issue C# IStructuralEquatable Kullanımı the standard warning hamiş to rely on the values of hashcodes or how they are computed, since it is hamiş guaranteed to be the same across updates or platforms.
Do hamiş 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.
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Burada dikkat ederseniz eğer ms.x ve ms.y bileğçalışmameyeceğinden dolayı bir Deep Copy lafız konusudur. şayet referans tipli kuruluşlar olsalardı adidaki kabilinden bir sonuç elde edilecekti ve Shallow Copy lafız konusu olacaktı.