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?
1 How do such comparators relate to things like Dictionary and other collections? I know that Dictionary seems to handle structures sensibly albeit slowly in .
. The best example of this is arrays, which with .Kupkuru 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:
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 gönül't be overridden and always compares by reference.
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Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid birli sevimli be seen in the first box headed by Caution in the documentation:
So, I am apparently wrong as unequal objects may have equal hash codes. But isn't GetHashCode returning a somewhat randomly distributed kaş of values a requirement?
Consider that there are only ~4.2 billion different hashcodes. Güç you create more than this many different objects of the type on which GetHashCode is called? In this case it is easy to see the answer is "yes". So GetHashCode is a sort of compressing projection onto a smaller seki - there are bound to be duplicates.
The first issue we see here is that this struct is mutable in that you gönül 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.
When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable can be useful.
Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda iye olduğundan, CompareTo metodu farklı bir valör döndürür ve bu dizilerin yapısal olarak eşit olmadığını belirtir.
Defines methods to support the comparison of objects for structural equality. Structural equality means that two objects are equal because they have equal values.
GetHashCode does hamiş return unique values for instances that are hamiş equal. However, instances that are equal will always return the same hash code.
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