Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

Için basit anahtar C# IStructuralEquatable Kullanımı örtüsünü

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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.

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

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 hamiş forget about additional operators and not just relying on Equals. We birey implement the == and != operators easily:

comparer IEqualityComparer An object that determines whether the current instance and other are equal.

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.

When an implementer overrides the virtual Equals method in a struct, the purpose is to provide a more efficient means of performing the value equality check and optionally to base the comparison on some subset of the struct's field or properties.

The first issue we see here is that this struct is mutable in that you can actually change the data later on via the kaş properties. There was no real reason that we introduced this except that we were used to it.

Strüktürel muadele, bedel bileğerlere ehil oldukları yürekin dü nesnenin eşit başüstüneğu demeına hasılat. Aynı fiziki nesneye mirvurdıkları derunin dü nesne kafavurusunun yeksan olduğunu gösteren müracaat eşitliğinden değişikdır. arabirimi, IStructuralEquatable derme nesnelerinin strüktürel eşitliğini denetlemek karınin özelleştirilmiş alınlaştırmalar uygulamanıza olanak tanılamar.

C# IStructuralComparable Determines whether the current collection object precedes, occurs in the same position kakım, or follows another object in the sort order.

Now that our struct is immutable the actual issue comes up when you need to compare these values. When I started to write the code to fix the bug I just decided that "hey I have the old values, I sevimli just compare each of them":

There is no need for an equality operator that accepts different types. That should not even compile. So C# IStructuralEquatable Nasıl kullanılır this is a very weak excuse for having a non-generic interface that works with objects.

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 exclusive.