C# IStructuralEquatable nedir Ile ilgili detaylı notlar

C# IStructuralEquatable nedir Ile ilgili detaylı notlar

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This is really amazing code and works great for .Safi Standard libraries. If you are in a .Safi Core 2.1 application there is an even cooler way of doing this:

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

It is used by the third example bey an argument to the Equals(Object, IEqualityComparer) method of the IStructuralEquatable interface that tuples implement. It compares two Double or two Single values by using the equality operator. It passes values of any other type to the default equality comparer.

– 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.

1 My understanding is that it's used for collection like types, and encapsulates the structural part of the comparison, but leaved the comparison of the elements to a comparer passed in by the user. But I'm not really sure if I really got it.

In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

comparer IEqualityComparer İki nesnenin müsavi olup olmadığını görmek midein kullanılacak yöntemi tanılamamlayan nesne.

I had the same question. When I ran LBushkin's example I was surprised to see that I got a different answer! Even though that answer özgü 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my take on things.

Net on a certain platform, I'm compelled to issue the standard warning not to rely C# IStructuralEquatable nerelerde kullanılıyor on the values of hashcodes or how they are computed, since it is derece guaranteed to be the same across updates or platforms.

Tamam, makalede eksiklikler olabilir. Bunu tenkit olarak kabul ediyorum. Işlevsel programlamada struct kullanılmasının nedenini de bilmiyor, başarım ve öteki konular karşı da herhangi bir kuruntu barındırmıtefsir. Siz biliyorsanız lütfen aydınlatır mısınız?

Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. Birli the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

However, this is hamiş so great if you are using the struct in a dictionary kakım my good friend Dustin mentioned to me because a Dictionary will always use the object version of Equals, which falls back to boxing :(