If two objects compare birli equal, the GetHashCode method for each object must return the same value. However, if two objects do not compare bey equal, the GetHashCode methods for the two object do hamiş have to return different values.
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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.
Kakım far kakım I see this is only exposed through the StructuralComparisons class. The only way I gönül 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.
The generic tuple classes (Tuple, Tuple, Tuple, and so on) and the Array class provide explicit implementations of the IStructuralEquatable interface. By casting (in C#) or converting (in Visual Basic) the current instance of an array or tuple to an IStructuralEquatable interface value and providing your IEqualityComparer implementation as an argument to the Equals method, you hayat define a custom equality comparison for the array or collection.
The IEquatable implementation will require one less cast for these classes and bey a result will be slightly faster than the standard object.Equals method that would be used otherwise. As an example see the different implementation of the two methods:
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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)
If you read this entire post and are thinking wow that is a lot of code and steps to remember then do derece fear because Dustin told me and showed me that Visual Studio will generate all of this for you!!!!! Check this out:
GitHub'da bizimle ortaklaşa iş mimarin Bu derunğin kaynağı GitHub'da bulunabilir; burada hatta sorunları ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Daha bir tomar bilim için ulamada bulunan kılavuzumuzu inceleyin.
Bu yapıya denli oluşturduğumuz tüm nesnelerin Heap kısmında olduğunu söylemiştik. Halbuki Stack kısmında struct strüktürsında nesneleri tutabilmekteyiz.
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Being able to specify IStructuralEquatable/IStructuralComparable in such cases C# IStructuralEquatable Temel Özellikleri 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 derece mutually exclusive.