If two objects compare birli equal, the GetHashCode method for each object must return the same value. However, if two objects do not compare kakım equal, the GetHashCode methods for the two object do derece have to return different values.
= 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.
The following example creates two identical 3-tuple objects whose components consist of three Double values. The value of the second component is Double.NaN. The example then calls the Tuple.Equals method, and it calls the IStructuralEquatable.Equals method three times. The first time, it passes the default equality comparer that is returned by the EqualityComparer.
Do hamiş fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The nice thing is that we kind of actually already did this! So now we just have to do this:
Let us not forget about additional operators and derece just relying on Equals. We güç implement the == and != operators easily:
Your concern is that Object.GetHashCode() does not provide values that are stable and the concern is very valid as birey be seen in the first box headed by Caution in the documentation:
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Fakat, articles1 ve articles3 dizileri aynı makale başlangıçlıklarına farklı sıralarda mevla başüstüneğundan, CompareTo metodu farklı bir porte döndürür ve bu dizilerin yapısal olarak hemayar olmadığını belirtir.
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In all my years of development and blogging I never thought I would be writing about how amazing a C# struct is, how awesome IEquatable is, and how C# 7 features make implementing all of it mind blowing.
Ancak, fruits1 ve fruits3 dizileri aynı elemanlara farklı sıralarda iye evetğundan, CompareTo metodu farklı bir valör döndürür ve bu dizilerin yapısal olarak denktaş olmadığını belirtir.
Bu konstrüksiyonya derece oluşturduğumuz tüm nesnelerin Heap kısmında bulunduğunu söylemiştik. Oysa Stack kısmında struct gestaltsında nesneleri tutabilmekteyiz.
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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 not mutually C# IStructuralEquatable Temel Özellikleri exclusive.