The "No" in part 2 of the answer is actually incorrect. Note: Tried editing the answer, but apparently some think that the highest rated answer being incorrect is not reason enough to approve a correction edit.
= to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading.
Other types which implement structural equality/comparability include tuples and anonymous types - which both clearly benefit from the ability to perform comparison based on their structure and content. A question you didn't ask is:
Does anyone know what happens if you do hamiş implement iequtalable when using generic collections? 2
Birli an example, it might make sense for two different instances of an Employee class to be considered equal if they both represent the same entity in your system.
Your concern is that Object.GetHashCode() does hamiş provide values that are stable and the concern is very valid bey emanet be seen in the first box headed by Caution in the documentation:
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 hamiş really sure if I really got it.
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.
Ayrıksı bir ifadeyle, kendi konstrüktif muadele tanılamamınızı oluşturabilir ve bu teşhismın arabirimi onaylama IStructuralEquatable fail bir C# IStructuralEquatable Nasıl kullanılır derme türüyle kullanılacağını belirtebilirsiniz. Arabirimin iki üyesi vardır: Equals, belirtilen IEqualityComparer bir uygulamayı kullanarak eşitliği test değer ve GetHashCodeeşit olan nesneler için aynı karma kodları döndürür.
Bir önceki işlemin aynısını AsOrdered extensionı ile gestaltldığında iş yeniden koşut olarak gestaltlır, ancak skorlar sıralı evet.
Your browser isn’t supported anymore. Update it to get the best YouTube experience and our latest features. Learn more
Do derece send hash codes across application domains or processes. In some cases, hash codes may be computed on a per-process or per-application domain basis.
GetHashCode does not return unique values for instances that are hamiş equal. However, instances that are equal will always return the same hash code.
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.