Düşünceler Hakkında Bilmek C# IEqualityComparer Temel Özellikleri ve Kullanımı

Düşünceler Hakkında Bilmek C# IEqualityComparer Temel Özellikleri ve Kullanımı

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MarkusMarkus 22k44 gold badges3333 silver badges5959 bronze badges 1 I prefer your solution, because it causes no runtime overhead and tankes place only in tests.

When you find yourself really to need this because you have to many properties you probably have some basic sıkıntı bey your class is doing too much.

This said, let's return to our ActorComparer. You might suggest that to achieve the goal we need to perform some more complex modifications, but no - all we have to do is use the comparer the new way:

next, when we iterate over the query object it gets hash code for each item in the source collection and compares it with the hashes of preceding objects

Your GetHashCode implementation always returns the same value. Distinct relies on a good hash function to work efficiently because it internally builds a hash table.

Photo by Moosa Haleem Equality might seem straightforward, but it tends to get fuzzier the longer you think about it. When it comes to programming, there are two general thoughts around equality.

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Fields emanet be null — appears if there are any nullable fields or properties in your type. By default, this checkbox is selected, meaning that ReSharper will generate null checks for selected fields. You sevimli clear this checkbox if you do not need null checks.

Going with your example, say that you wanted to compare the objects ignoring C# IEqualityComparer Nasıl Kullanılır case, so that "Apple" and "apple" would be considered the same object. Then your ProductComparer may look like:

Bu şifre, her 1 saniyede bir “Timer tetiklendi.” yazkaloriı konsola yazdıracaktır. Izlenceı sonlandırmak midein rastgele bir tuşa basmanız yeterlidir.

Members Generation page of ReSharper options.

In the LINQ world, generating the IEqualityComparer interface is a tedious task, especially because we don’t have sufficient time. Our generic class comes C# IEqualityComparer Nasıl Kullanılır in handy for making things easier for us.

And yes, after this the output of the program 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 veri for pushing to veri base, so I ended up C# IEqualityComparer nedir with SQL Server telling me that I am breaking a primary C# IEqualityComparer Temel Özellikleri ve Kullanımı 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 kakım efficiently kakım possible.

Or if you need to change how the comparer sorts, that C# IEqualityComparer nerelerde kullanılıyor you have to change them all? Lets say you do that comparison in 500 places, some in 3rd party code, now you have a maintenance nightmare.