En iyi Tarafı C# IEqualityComparer Nasıl Kullanılır
En iyi Tarafı C# IEqualityComparer Nasıl Kullanılır
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Microsoft'un teknoloji kaygılıları muhtevain sunduğu giranbaha bir platform olan Channel 9’da taraf düzlük Jump Start serisi, C# programlama dili öğrenmek isteyenler kucakin harika bir başlangıçtır.
Derive from this class to provide a custom implementation of the IEqualityComparer generic interface for use with collection classes such bey the Dictionary generic class, or with methods such as List.Sort.
1 Foo should be immutable if you intend to use it as key in hash tables. An in that case new properties needs to be seki using the ctor's paramsters, and anyone doing so would see that your sınav for the Comparer no longer compiles.
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 has internal knowledge of how to compare itself to another instance of T.
This interface allows the implementation of customized equality comparison C# IEqualityComparer nedir for collections. That is, you sevimli create your own definition of equality, and specify that this definition be used with a collection C# IEqualityComparer Temel Özellikleri ve Kullanımı type that accepts the IEqualityComparer interface.
If you change your class to implement IEquatable instead, C# IEqualityComparer Kullanımı the implementation of Distinct (which will use EqualityComparer.Default which in turn sees your type implements IEquatable and delegates to that) will work as you expect.
Basically you could check all the properties you want to check in Equals via reflection. To filter some of them out use an attribute on those properties:
Tamam her şeyi tanılamamladık çok kandırıcı mahiyet taksir geçelim pratikte bunu nasıl yapacağız? Listemizi zati teşhismlamıştık kalmış olduğumız yerden devam edelim.
Going with your example, say that you wanted to compare the objects ignoring case, so that "Apple" and "apple" would be considered the same object. Then your ProductComparer may look like:
recordが利用可能なケースではできるだけrecord型で定義するようにしましょう。
C# ile veritabanlarına ulaşım sağlayan uygulamalar vüruttirebilirsiniz. ADO.Kemiksiz gibi teknolojiler, veritabanı etkileşimini kolaylaştırır.
No property will be added at runtime. I only want C# IEqualityComparer nedir to ensure that nobody modify this class without make some sınav red. We are hundreds in the team and some guy could modify the class without notice side effects.
Doing that you changed the behavior for a single class, what if you need the same logic for other classes? If you need C# IEqualityComparer Temel Özellikleri ve Kullanımı a "generic comparison". That is why you have IEqualityComparer.