Hakkında C# IStructuralEquatable nerelerde kullanılıyor

Hakkında C# IStructuralEquatable nerelerde kullanılıyor

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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.

Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great.

That is right! When we override Equals we must also override and implement GetHashCode. I am no HashCode expert, but in the same article from Sergey is a snippet of using a ValueTuple to simplify this entire call to 1 line of code just like our fancy ValueTuple Equality above.

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

Kakım 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 not provide values that are stable and the concern is very valid kakım dirilik be seen in the first box headed by Caution in the documentation:

The IStructuralEquatable interface enables you to implement customized comparisons to check for the structural equality of collection objects. This is also made clear by the fact that this interface resides in the System.Collections namespace.

Defines a generalized method that a value type or class implements to create a type-specific method for determining equality of instances.

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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 saf 8 upvotes, it is wrong. After a lot of 'reflector'ing, here is my C# IStructuralEquatable nedir take on things.

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Here the comparison is different for value type arrays and custom arrays. In .Kemiksiz 4.0 int, string will internally implement IEquatable for custom types we have to externally implement the IEquatable.

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