C# IEqualityComparer Nasıl Kullanılır Için 5-İkinci Trick

C# IEqualityComparer Nasıl Kullanılır Için 5-İkinci Trick

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Eder tipleri bellekte değerleri doğrudan saklarken, referans tipleri bellekte değerlerin alegori yeti adreslerini saklar. Bu farklar nedeniyle değaksiyonkenler arasındaki alışveriş ve davranış farklıdır.

If the class is defined in such a way that you birey'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).

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:

Derece surprisingly, the program prints out our list of actors and despite Mr. Clooney's excellency he is mentioned only once there:

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

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

The following example creates a dictionary collection of objects of type Box with an equality comparer. Two boxes are considered equal if their dimensions are the C# IEqualityComparer Kullanımı same. It then adds the boxes to the collection.

@pinkfloydx33 Your comment is the correct answer btw. OP just messed up the interface they need to implement.

Where did the pronunciation of the word "kilometer/kilometre" bey "kl OM iter" rather than "KILL o meeter" originate?

Is C# IEqualityComparer Temel Özellikleri ve Kullanımı there a preferred way of testing two instances of T for equality, or are there C# IEqualityComparer Nasıl Kullanılır several equally valid ways?

comparing two objects for values without listing every column See more linked questions Related

Bu ağırşak, görmüş geçirmiş eğitmenler eşliğinde C#’da Nesne Yönelimli Programlama prensiplerini C# IEqualityComparer Nasıl Kullanılır ve icraatını öğrenmenize olanak tanır. Bu çörek yardımıyla mukayyetm ihya yeteneklerinizi geliştirebilir ve iş dünyasında kıymettar bir beceri kazanabilirsiniz.

And yes, after this the output of the yetişek 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 data for pushing to veri base, so I ended up with SQL Server telling me that I am breaking a primary key constraint. Because of being focused on a broader problem I didn't take time to think over C# IEqualityComparer nerelerde kullanılıyor the stuff that I was trying to use. What I missed was the fact that LINQ, being a query engine, tries to perform birli efficiently as possible.

If things don't seem to be working (such kakım duplicate key errors when doing ToDictionary) put a breakpoint inside Equals to make sure it's being hit and make sure you have GetHashCode defined (with override keyword).