Hakkında C# IEqualityComparer Kullanımı

Hakkında C# IEqualityComparer Kullanımı

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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).

If you want a generic solution that creates an IEqualityComparer for your class based on a property (which acts kakım a key) of that class have a look at this:

When i am using dictionaries sometimes I have to change the default Equals meaning in order to compare Keys. I see that if I override the Equals and GetHashCode on the key's class or i create a new class which implements IEqualityComparer I have the same result. So what's the difference between using IEqualityComparer and Equals/GethashCode Override?

If there is only one way of testing two instances of T for equality, or if one of several methods is preferred, then IEquatable would be the right choice: This interface is supposed to be implemented only by T itself, so that one instance of T saf internal knowledge of how to compare itself to another instance C# IEqualityComparer nerelerde kullanılıyor of T.

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This is because LINQ methods accept IEnumerable C# IEqualityComparer Nasıl Kullanılır birli a parameter. Consequently, they have no concept of the implementation of the original list.

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Tamam her şeyi tanılamamladık çok anlı şanlı cins kısma C# IEqualityComparer Temel Özellikleri ve Kullanımı geçelim pratikte bunu nasıl yapacağız? Listemizi zati tanımlamıştık kaldığımız yerden devam edelim.

public int x get; takım; public string y get; grup; public string z get; grup; public string w get; takım;

Most of the time a comparison could be implemented with some amount of linq. If it's one-off, the choice is probably just down to personal preference.

Örnekte, kullanıcıların eşit olup olmadığını arama ederken kullanıcı adları dikkate alınmıştır.

So I'm hamiş C# IEqualityComparer Kullanımı 100% clear why you need the extra comparer. Just the single comparer should be sufficient.

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I'm glad the post was of some value to you. If you are looking to avoid common problems arising with LINQ, you may also like my post diving into what deferred nature of some LINQ methods means to C# IEqualityComparer Temel Özellikleri ve Kullanımı a programmer: [^]