C# IStructuralEquatable Nasıl kullanılır Ile ilgili detaylı notlar

C# IStructuralEquatable Nasıl kullanılır Ile ilgili detaylı notlar

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

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 not fear because if you simply implement IEquatable the dictionary will use the strongly typed version! The birçok thing is that we kind of actually already did this! So now we just have to do this:

I'm amazed that the most important reason is hamiş mentioned here. IEquatable was introduced mainly for structs for two reasons:

Your concern is that Object.GetHashCode() does not provide values that are stable and the concern is very valid birli dirilik be seen in the C# IStructuralEquatable Temel Özellikleri first box headed by Caution in the documentation:

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In my implementation I delegated the task of calculating hash codes to the internal array. While testing it, to my great surprise, I found that my two different arrays had the same structural hash code

Ray BooysenRay Booysen 29.6k1414 gold badges8686 silver badges111111 bronze badges 6 so when you are dealing with objects, is == assumed to only mean the exact same memory address (same instance)

Task oluşturmanın mesleklemci üzerinde maliyeti vardır ve çok kısa süren anlayışlemler karınin bir task tesis etmek genelde daha yavaş çalışan uygulamalara sebep olabilir.

This member is an explicit interface member implementation. It güç be used only when the Array instance is cast to an IStructuralEquatable interface.

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 gönül just compare each of them":

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