Büyülenme Hakkında C# IStructuralEquatable nedir

Büyülenme Hakkında C# IStructuralEquatable nedir

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Keep in mind that for this interface to work correctly, the types within the collection or structure must also implement IStructuralEquatable or provide their own structural equality logic.

In certain scenarios (such as using the value type kakım a key in a dictionary) it can murder performance in one foul swoop.

. The best example of this is arrays, which with .NET 4 now implement the IStructuralEquatable interface. This makes it possible to distinguish whether you are comparing two arrays for reference equality, or for "structural equality" - whether they have the same number of items with the same values in each position. Here's an example:

Kakım far kakım I see this is only exposed through the StructuralComparisons class. The only way I can figure out to make this useful is to make a StructuralEqualityComparer helper class as follow:

Let us not forget about additional operators and not just relying on Equals. We gönül implement the == and != operators easily:

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Aynı ustalıklemi her bir iterasyon yürekin bir task oluşturup yapabiliyorken ne Paralel bir döngü oluşturmalıyız?

Yani anlayacağınız “int” gibi, “bool” kabil mesabe tipli bir parametre peydahlamak istiyorsanız struct yapısını yeğleme edebilirsiniz.

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

Bu örnekte, articles1 ve articles2 dizileri aynı makale esaslıklarına aynı sırada ehil olduğundan, CompareTo metodu 0 döndürerek bu dizilerin yapısal olarak denktaş olduğunu belirtir.

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

Default property. The second time, it passes the default equality comparer that is returned by the StructuralComparisons.StructuralEqualityComparer property. The third time, it passes the custom NanComparer object. Kakım the output from the example shows, the first three method calls return true, whereas the fourth call returns false.

The Equals method supports custom structural comparison of array and tuple objects. This method in turn calls the comparer object's IEqualityComparer.Equals method to compare individual array elements or tuple components, starting with the first element or component.