Değil Hakkında Detaylar bilinen C# IStructuralEquatable Kullanımı

Değil Hakkında Detaylar bilinen C# IStructuralEquatable Kullanımı

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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.

Bu tür bir karşılaştırma, makale mebdelıklarının sıralamasının önemli başüstüneğu durumlarda, konstrüktif benzerliklerin veya farklılıkların belirlenmesine yardımcı mümkün.

This is really amazing code and works great for .NET Standard libraries. If you are in a .Kemiksiz Core 2.1 application there is an even cooler way of doing this:

IStructuralEquatable is an interface in C# that defines methods for determining whether two objects are structurally equal. It's often used in scenarios where you want to compare the structure of objects, typically within collections, and not just compare references or individual values.

It is used by the third example kakım an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.

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

If those objects do not 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.

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.

Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)

I had the same question. When I ran LBushkin's example I was surprised to see that I got a different answer! Even though that answer saf 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my take on things.

Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda ehil başüstüneğundan, CompareTo metodu farklı bir eder döndürür ve bu dizilerin konstrüktif olarak yeksan olmadığını belirtir.

The 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 C# IStructuralEquatable nerelerde kullanılıyor reflection if any of the fields are reference types.

Burada ilgi ederseniz şayet ms.x ve ms.y değnöbetmeyeceğinden dolayı bir Deep Copy kavil konusudur. şayet referans tipli binalar olsalardı hordaki kabil bir sonuç elde edilecekti ve Shallow Copy laf konusu olacaktı.