I'm using xUnit and it doesn't have a way to determine if 2 IEnumerable are equal if T is custom type.
If you want a generic solution that creates an IEqualityComparer for your class based on a property (which acts birli a key) of that class have a look at this:
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IEqualityComparer is an interface which is used to find whether an object is equal or not. We will see this in a sample where we have to find the distinct objects in a collection. This interface will implement the method Equals(T obj1,T obj2).
IEqualityComparer is an interface for an object that performs the comparison on two objects of the type T.
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in case a particular hash value was hamiş encountered before, the corresponding object makes its way into the result
More importantly, I have stepped into the trap of thinking that objects, which I use in my code, güç be only partially relevant to me, while in case we do OOP every object C# IEqualityComparer Temel Özellikleri ve Kullanımı must be considered in its entirety (things like SOLID help us with that.) This way, when implementing the IEqualityComparer interface I should have paid more attention to the presence of GetHashCode(..) method. This would solve my mesele at once, because it is this same method that LINQ uses when asked to extract distinct objects and perform other equality related operations (see Grup operators in this article). To verify this we add a debug message to the method and observe several C# IEqualityComparer Nasıl Kullanılır calls to it:
Most of the time a comparison could be implemented with some amount of linq. If it's one-off, C# IEqualityComparer nedir the choice is probably just down to personal preference.
Selamlar, bu makalemda C#’ da Enum’ı müessir nasıl kullanabilirizi ve kullanma metodoloji üzerinde duracağım. Peşi sıra enumeration class’ı ile henüz tesirli enum yararlanmaını göstereciğim.
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And yes, after this the output of the program C# IEqualityComparer Temel Özellikleri ve Kullanımı doesn't change at all. So, what the hell is LINQ doing and why doesn't it even try to use the equality comparer that we have provided? The situation was even bitter for me because I was trying to use Distinct() combined with custom equality comparer to prepare data for pushing to veri base, so I ended up with SQL Server telling me that I am breaking a primary key constraint. Because of being focused on a broader sorun I didn't take time to think over the stuff that I was trying to use. What I missed was the fact that LINQ, being a query engine, tries to perform as efficiently kakım possible.
Her iki öğretici de kullanıcıların C# dilinin temellerini kavramalarını kurmak üzere detaylı ve etap aşama örneklerle zenginleştirilmiştir.