En C# IStructuralEquatable Nasıl kullanılır Sırları
En C# IStructuralEquatable Nasıl kullanılır Sırları
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However, this is an implementation detail and unless you want to rely on this in your code you cannot create a stable hash code provide an object that implements IStructuralEquatable.
In this case you don't want to change your class implementation so you don't wantoverride the Equals method. this will define a general way to compare objects in your application.
This is really amazing code and works great for .NET Standard libraries. If you are in a .Safi Core 2.1 application there is an even cooler way of doing this:
As far kakım I see this is only exposed through the StructuralComparisons class. The only way I can figure out to make this useful is to make a StructuralEqualityComparer helper class as follow:
Bildiğiniz kabil new işletmenü classlarda kullanıldığı devran müteallik classtan bir nesne talep edilmekte ve üretilen nesne belleğin Heap kısmında korunum edilmektedir.
Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid birli güç be seen in the first box headed by Caution in the documentation:
After some more testing I found that any two arrays with C# IStructuralEquatable Kullanımı the same first element have the same hash. I still think this is strange behavior.
Consider that there are only ~4.2 billion different hashcodes. Gönül 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.
comparer IEqualityComparer İki nesnenin eşit olup olmadığını kullanmak için kullanılacak yöntemi teşhismlayan nesne.
Bu örnekte, articles1 ve articles2 dizileri aynı makale kellelıklarına aynı sırada mevla evetğundan, CompareTo metodu 0 döndürerek bu dizilerin konstrüktif olarak müsavi bulunduğunu belirtir.
To achieve this, employee objects with matching SSN properties would be treated birli logically equal, even if they were not structurally equal. Share Improve this answer Follow
That is, you hayat create your own definition of structural equality and specify that this definition be used with a collection type that accepts the IStructuralEquatable interface. The interface has two members: Equals, which tests for equality by using a specified IEqualityComparer implementation, and GetHashCode, which returns identical hash codes for objects that are equal.
The IStructuralEquatable interface supports only custom comparisons for structural equality. The IStructuralComparable interface supports custom structural comparisons for sorting and ordering.
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 hamiş mutually exclusive.