Satın Almadan Önce C# IEqualityComparer nerelerde kullanılıyor Things To Know

Satın Almadan Önce C# IEqualityComparer nerelerde kullanılıyor Things To Know

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If you do decide you need a comparer, you can certainly use a generalized comparer (see DMenT's answer), but if you need to reuse that logic you should encapsulate it in a dedicated class. You could even declare it by inheriting from the generic base:

The comparer doesn't handle Dictionary, since you're only looking for IList; if you started looking for IEnumerable (and added a special case for KeyValuePair) it would handle dictionaries as well

1 Foo should be immutable if you intend to use it bey key in hash tables. An in that case new properties needs to be takım using the ctor's paramsters, and anyone doing so would see that your test for the Comparer no longer compiles.

Make the properties / fieldInfos fields static; they don't change for each closed instance of the type PropertiesByValueComparer (i.e., for each T passed to it), so you don't need to initialize them for every new instance of the comparer

This was a point of some debate and there are arguments on three sides: choose the more specific of the types, choose the more general of the types, or have type inference yapan. I will hamiş rehash the whole argument but suffice to say that the "choose the more general" side won the day.

This cannot detect that a new property was added, and that this property differs in the two objects.

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Comparing types is optional and depends on your inheritance structure, but in this case, if the two players aren’t the same type, then they are not equal.

When dealing with comparison, it is essential to understand the difference between precise comparison and logical comparison. Luckily for us, .Kupkuru saf the C# IEqualityComparer nerelerde kullanılıyor IEqualityComparer that is used by LINQ.

The Func is a class standing for something that might be called with MovieActor argument and must yield a result of type object. Although generally I don't like dealing with pure object's in my code, this is a valid way to define a key selector hamiş bounding it to some specific key type.

We will make the previous example, but C# IEqualityComparer Temel Özellikleri ve Kullanımı we’ll use GenericEqualityComparer class. Remember this class isn’t only suitable for any customer field or any customer field’s combination, but also for any field class or any field’s combination of any class.

2 It affects other places in a positive way, you generally want to implement it for a data class like this

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The result is the same kakım when using the first version of ActorComparer, although the new one C# IEqualityComparer Temel Özellikleri ve Kullanımı is much more flexible in the sense that it may be used differently in different contexts and no further modifications are required to its code.