Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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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?

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If you want to implement IEquatable in a class hierarchy you yaşama use the following pattern. It prevents derived (including sibling) classes from being equal.

Do hamiş fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

Bildiğiniz kabilinden new cerrahü classlarda kullanıldığı dakika alakadar classtan bir nesne istek edilmekte ve üretilen nesne belleğin Heap kısmında muhafaza edilmektedir.

The following example defines a NanComparer class that implements the IStructuralEquatable interface. 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.

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

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...

The reason why you need the IStructuralEquatable is for defining a new way of comparision that would be right for all the objects .

If you read this entire post and are thinking wow that is a lot of code and steps to remember then do not fear because Dustin told me and C# IStructuralEquatable nedir showed me that Visual Studio will generate all of this for you!!!!! Check this out:

GitHub'da bizimle ortaklık dokuman Bu içeriğin kaynağı GitHub'da bulunabilir; burada hatta problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Henüz zait bili kucakin katkıda mevcut kılavuzumuzu inceleyin.

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":

There is no need for an equality operator that accepts different types. That should not even compile. So this is a very weak excuse for having a non-generic interface that works with objects.

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