Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler

Açıklanan C# IStructuralEquatable nerelerde kullanılıyor Hakkında 5 Kolay Gerçekler

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However, this is an implementation detail and unless you want to rely on this in your code you cannot create a stable hash code provide an object that implements IStructuralEquatable.

In certain scenarios (such as using the value type as a key in a dictionary) it dirilik murder performance in one foul swoop.

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

LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why yaşama't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?

Bildiğiniz gibi new operatrisü classlarda kullanıldığı dem alakadar classtan bir nesne talep edilmekte ve üretilen nesne belleğin Heap kısmında saklama edilmektedir.

– Royi Namir Commented Mar 3, 2012 at 18:04 @RoyiNamir user844541's answer is correct, but maybe it is still hard for you to understand without a concrete example, if you are familiar with IEqualityComparer and how it is used by Linq's Distinct(), then after check the source code to see how it implement IStructuralEquatable on referencesource.microsoft.com/#mscorlib/system/collections/…, then you will see how it work.

What does IEquatable buy you, exactly? The only reason I sevimli see it being useful is when creating a generic type and forcing users to implement and write a good equals method.

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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)

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

This member is an explicit interface member implementation. It birey be used only when the Array instance is cast to an IStructuralEquatable interface.

That is, you birey create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface saf two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.

You observations does hamiş conflict with the documentation and there is no bug in the implementation.

3 feature called Tuple Equality! That is right, you dirilik create a ValueTuple and simply compare them kakım they are super optimized, don't create any objects, and reduce this to a single line of code!