Why do we have IStructuralComparable and IStructuralEquatable when there already exist the IComparable and IEquatable interfaces? The answer I would offer is that, in general, it's desirable to differentiate between reference comparisons and structural comparisons.
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. The best example of this is arrays, which with .NET 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:
LBushkinLBushkin 131k3333 gold badges217217 silver badges265265 bronze badges 11 8 Why birey't you just specify an IEqualityComparer yourself that does this? What does the IStructuralEquatable interface add to this?
This code technically works, but is sort of a hot mess and is not really maintainable. Anyone using the library would have to write this code bey well. The next logical step would be to just use .Equals on the entire metrics.
The IStructuralEquatable interface enables you to implement customized comparisons to check C# IStructuralEquatable Temel Özellikleri for the structural equality of collection objects.
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I've noticed these two interfaces, and several associated classes, have been added in .Safi 4. They seem a bit superfluous to me; I've read several blogs about them, but I still kişi't figure out what sıkıntı they solve that was tricky before .Kupkuru 4.
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In addition to this awesome blog Frank and I also dicussed all of this awesome in detail on Merge Conflict on episode 111:
C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position birli, or follows another object in the sort order.
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 hayat just compare each of them":
Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.
Specifically, I do not know the exact type of the object. The only assumption I make is that it inherit from IStructuralEquatable.