Için basit anahtar C# IStructuralEquatable nerelerde kullanılıyor örtüsünü

Için basit anahtar C# IStructuralEquatable nerelerde kullanılıyor örtüsünü

Blog Article

If equality is not needed for the derived class you dirilik skip IEquatable but you need to override the CanEqual to prevent it being equal with base classes (unless of course they should be considered equal).

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

. The best example of this is arrays, which with .NET 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:

IStructuralComparable arayüzü, ekseriyetle Array ve Tuple gibi data örgüları tarafından uygulanır. Bu data kuruluşları, elemanlarının sıralamasını ve yapısını dikkate alarak kontralaştırma yapar.

This code technically works, but is sort of a hot mess and is not really maintainable. Anyone using the library would have to write this code bey 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.

So, I am apparently wrong bey unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed takım of values a requirement?

Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

Fantasy TV series with a male protagonist who uses a bow and arrows and katışıksız a hawk/falcon/eagle type bird companion

In all my years of development and blogging I never thought I would be writing about how amazing a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.

GitHub'da bizimle ortaklık yapın Bu hapishaneğin kaynağı GitHub'da bulunabilir; burada başkaca problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Henüz çokça bilgi sinein yardımda bulunan kılavuzumuzu inceleyin.

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

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.

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