C# IEqualityComparer Temel Özellikleri ve Kullanımı Üzerinde Buzz söylenti

C# IEqualityComparer Temel Özellikleri ve Kullanımı Üzerinde Buzz söylenti

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Here, you'll find a first simple code sample that works only on simple types (the ones composed only by primitif properties), and a second one that is complete (for a wider range of classes and complex types).

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Alternatively, you sevimli write an empty comparer class that implements IEqualityComparer, and then pick the corresponding quick-fix from the Ast+Enter menu:

Make the properties / fieldInfos fields static; they don't change for each closed instance of the type PropertiesByValueComparer (i.e., for each T passed to it), so you don't need to initialize them for every new instance of the comparer

Protected: Kontrol, yalnız türetilen sınıflar veya aynı derlemedeki sınıflar aracılığıyla erişilebilir hale hasılat. Bu durumda, denetlemeün erişimi sınırlıdır ve salt sınırlı sınıflar tarafından erişilebilir.

Scroll down to the part on KeyEqualityComparer and especially the part on the importance of GetHashCode. There is a whole discussion on why obj.GetHashCode(); (bey suggested by DMenT's post) C# IEqualityComparer Temel Özellikleri ve Kullanımı is wrong and should just return 0 instead.

The issue here is that comparing floating-point numbers for equality might not work bey expected, due to minute rounding errors. There are different methods of comparing floating-point numbers for near-equality

When you override Equals and GetHashCode you are changing the way the object will determine if it is equals to another. And a note, if you compare objects C# IEqualityComparer Kullanımı using == operator it will derece have the same behavior bey Equals unless you override the operator kakım well.

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operating on different types C# IEqualityComparer Nasıl Kullanılır of classes, even complex types including sub-objects or nested lists. And derece only on simple classes comprising only primitive type properties.

When we make the inference from allPositions to IEnumerable we say "IEnumerable is covariant in T, so C# IEqualityComparer nerelerde kullanılıyor we sevimli accept Position or any larger type

You could do this more elegantly using FluentAssertions library. It başmaklık plenty assertion methods for collections.

Finally, if you just need to filter collection for distinct values based on some key and you want to do it C# IEqualityComparer nedir quickly with birli few additional actions birli possible, there is a trick that doesn't require creating new types:

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