C# IEqualityComparer Kullanımı No Further Mystery

C# IEqualityComparer Kullanımı No Further Mystery

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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.

If the class is defined in such a way that you güç't define it kakım IEquatable. This would include classes defined by others and classes generated by the compiler (specifically anonymous types, which use a property-wise comparison by default).

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Özellikle Dictionary, HashSet kadar bilgi dokumalarıyla alay malay kullanılarak özelleştirilmiş katlaştırmalar katkısızlar. Böylece, farklı muta tipleri veya kompozitşık karşıtlaştırma kuralları mucip durumlarda kullanıcıevet elastikiyet katkısızlar.

This interface allows the implementation of customized equality comparison for collections. That is, you güç create your own definition of equality, and specify that this definition be used with a collection type that accepts the IEqualityComparer interface.

Since IEqualityComparer is contravariant in the type T, you birey use the base class comparer with distinct if you specify the generic parameter to Distinct:

However you should have some good pre-checks within GetHashCode to avoid unneccessary calls to this slow method.

We’ll write a classic implementation of IEqualityComparer class. In our example, C# IEqualityComparer Temel Özellikleri ve Kullanımı we need to compare customers. Two customers are distinct if your first char Name is different.

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

This C# IEqualityComparer Kullanımı interface, also added in 2.0, allows you to pass custom object equality checking to a Hashtable, Dictionary and NameValueCollection. You pass in your custom comparison implementation much like you C# IEqualityComparer Nasıl Kullanılır do with IComparer and the Hashtable will use this for equality checks.

Evet o yardımcı Description attribute bizim mukabilmıza çıkar. Bu attribute ile C# IEqualityComparer nerelerde kullanılıyor ne enum elamanının niye var bulunduğunu , ne yürekin bu bileğere mevla olduğunu cılızçe tanımlayabiliriz ve bu description’a erişebiliriz.

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I have to say, that there are other methods to create an equality comparer with similar functionality. For example, see this article on CodeProject - it demonstrates how to use reflection to obtain and compare property values.

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