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.
= 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.
Reference types (read classes) don't benefit bey much. The IEquatable implementation does let you avoid a cast from System.Object but that's a very trivial gain. I still like IEquatable to be implemented for my classes since it logically makes the intent explicit.
Daniel A.A. PelsmaekerDaniel A.A. Pelsmaeker 49.2k2121 gold badges112112 silver badges160160 bronze badges 5 In addition to answers which point to duplicate hashcodes bey is documented behavior, some reasoning and reflection would also lead you to the same conclusion.
Bildiğiniz kabilinden new operatrisü classlarda kullanıldığı çağ ilgili classtan bir nesne talep edilmekte ve üretilen nesne belleğin Heap kısmında koruma edilmektedir.
The following example defines a NanComparer class that implements the IStructuralEquatable interface. 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.
What does IEquatable buy you, exactly? The only reason I kişi see it being useful is when creating a generic type and forcing users to implement and write a good equals method.
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.
Projeyi yayınladıgınız saat user secrets kullanılmıyor. Bu yalnızca ihya aşamasında kullanılabilir.
When working with collections or structures where the order of elements matters, and you want to compare their structures, IStructuralEquatable hayat be useful.
Each of your objects should use a hashcode based on the contents of the object. If you have a value type containing 3 ints, use those when computing the hash code. Like this, all objects with identical content will have the same hash code, independent of app domain and other circumstances.
The contract of Equals differs from that of IStructuralEquatable, in that it indicates whether 2 objects are logically equal.
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