That is, you sevimli create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface.
In certain scenarios (such kakım using the value type as a key in a dictionary) it güç murder performance in one foul swoop.
Reference types (read classes) don't benefit birli 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.
Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes as is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
I'm amazed that the most important reason is not mentioned here. IEquatable was introduced mainly for structs for two reasons:
Your concern is that Object.GetHashCode() does not provide values that are stable and the concern is very valid bey dirilik be seen in the first box headed by Caution in the documentation:
IStructuralEquatable is quite new and unknown, but I read somewhere that it dirilik be used to compare the contents of collections and arrays. Am I wrong, or is my .Kupkuru wrong?
I've noticed these two interfaces, and several associated C# IStructuralEquatable nedir classes, have been added in .Kemiksiz 4. They seem a bit superfluous to me; I've read several blogs about them, but I still gönül't figure out what sorun they solve that was tricky before .Safi 4.
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)
In Xamarin.Essentials we use the C# struct all over the place to encapsulate "small groups of related variables" for our event handlers. They are groups of data that don't need to be created by the developers consuming the data and are only really used for reading the data.
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Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.
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Specifically, I do derece know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.