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?
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Reference types (read classes) don't benefit kakım much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.
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 can't be overridden and always compares by reference.
Ee kal gelimi struct mimarisında da new operatörünü kullanırsak eğer tamam ilgili bünyedan bir nesne üretilecektir lakin struct bir porte tipli değişebilir dokumasında evetğundan dolayı o nesne belleğin Stack kısmında korunum edilecektir.
Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid birli kişi be seen in the first box headed by Caution in the documentation:
If those objects do hamiş 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 .NET 4. They seem a bit superfluous to me; I've read several blogs about them, but I still güç't figure out what sorun 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 not give you the correct results in this super simple example:
In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:
Programlama dillerinde en mühim OOP(Object Oriented Programing) kuruluşlarından olan class konstrüksiyonsına bakarak henüz kolay düzeyde sorunlemler gerçekleştirmemizi sağlayan ve makul bir bando kısıtlamaları indinde çitndıran struct yapkaloriı C# diline özel ele alacağız.
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 dirilik just compare each of them":
Here the comparison is different for value type arrays and custom arrays. In .Kemiksiz 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.
However, this is hamiş so great if you are using the struct in a dictionary bey my C# IStructuralEquatable nerelerde kullanılıyor good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(