2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

2 Dakika Kural için C# IStructuralEquatable Nasıl kullanılır

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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.

. The best example of this is arrays, which with .Kemiksiz 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:

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

As 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.

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What does IEquatable buy you, exactly? The only reason I kişi see it being useful is when C# IStructuralEquatable Kullanımı creating a generic type and forcing users to implement and write a good equals method.

Ancak, articles1 ve articles3 dizileri aynı makale kafalıklarına farklı sıralarda malik olduğundan, CompareTo metodu farklı bir değer döndürür ve bu dizilerin konstrüktif 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.

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Bu bünyeya kadar oluşturduğumuz tüm nesnelerin Heap kısmında olduğunu söylemiştik. Oysa Stack kısmında struct kuruluşsında nesneleri tutabilmekteyiz.

Just look at the default ValueType.Equals(object) code that gets called otherwise. It's an absolute performance killer that introduces boxing, type evaluation and finally falls back on reflection if any of the fields are reference types.

While writing my own immutable ByteArray class that uses a byte array internally, I implemented the IStructuralEquatable interface.