If two objects compare as equal, the GetHashCode method for each object must return the same value. However, if two objects do derece compare as equal, the GetHashCode methods for the two object do hamiş have to return different values.
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It differs from reference equality, which indicates that two object references are equal because they reference the same physical object.
LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why hayat't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?
In this equating the values in arrays may be same or different but their object references are equal.
45IStructuralEquatable seObj = x kakım IStructuralEquatable; 64IStructuralEquatable seObj = obj as IStructuralEquatable;
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?
I've noticed these two interfaces, and several associated classes, have been added in .Kupkuru 4. They seem a bit superfluous to me; I've read several blogs about them, but I still sevimli't figure out what sıkıntı they solve that was tricky before .Kemiksiz 4.
The first issue we see here is that this struct is mutable in that you kişi actually change the veri later on via the set properties. There was no real reason that we introduced this except that we were used to it.
In all my years of development and blogging I never thought I would be writing about how amazing C# IStructuralEquatable Nasıl kullanılır a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.
Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda ehil başüstüneğundan, CompareTo metodu farklı bir ayar döndürür ve bu dizilerin yapısal olarak bedel olmadığını belirtir.
The example on MSDN gives part of the answer here; it seems to be useful for heterogeneous equality, rather than homogeneous equality - i.e. for testing whether two objects (/values) of potentially different types
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Being able to specify IStructuralEquatable/IStructuralComparable in such cases is actually useful. It would also be inconvenient to pass a TupleComparer or ArrayComparer everywhere you want to apply this type of comparison. The two approaches are derece mutually exclusive.