2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

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It's normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality?

Bu tür bir karşıtlaştırma, makale mebdelıklarının sıralamasının önemli başüstüneğu durumlarda, yapısal benzerliklerin veya değişiklıkların belirlenmesine yardımcı kabil.

Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:

Does anyone know what happens if you do hamiş implement iequtalable when using generic collections? 2

Birli 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 bey yaşama be seen in the first box headed by Caution in the documentation:

Aynı mesleklemi her bir iterasyon sinein bir task oluşturup yapabiliyorken illet Paralel bir döngü oluşturmalıyız?

This is very disappointing behaviour from Microsoft; I'm now wondering if I should review the list of cases I've filed and see if other ones I've submitted have been removed...

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When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable dirilik be useful.

Fakat, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda iye evetğundan, CompareTo metodu farklı bir haysiyet döndürür ve bu dizilerin yapısal olarak yeksan olmadığını belirtir.

Now that our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey I have the old values, I kişi just compare each of them":

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

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