C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

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Microsoft'un uygulayım bilimi müptelaları yürekin sunduğu giranbaha bir ortam olan Channel 9’da yan saha Jump Start serisi, C# programlama dili öğrenmek isteyenler karınin harika bir mebdetır.

Derive from this class to provide a custom implementation of the IEqualityComparer generic interface for use with collection classes such birli the Dictionary generic class, or with methods such birli List.Sort.

C# diline giriş akdetmek veya mevcut bilgilerini genişletmek isteyenler dâhilin rast kaynaklara esasvurmak heybetli öneme sahiptir. İster temel seviye vukuf arayışında olun, ister gelecek düzem mevzularda uzmanlaşmak isteyin, C# dili öğrenmek saksıvurabileceğin 10 temel asıl şunlardır:

next, when we iterate over the query object it gets hash code for each item in the source collection and compares it with the hashes of preceding objects

Notice that I didn't have to override Equals, GetHashCode in neither of the classes. I emanet use this comparer in any object that implements ICustom without having to rewrite the comparison logic.

Please also note the use of the BindingFlags parameter so you birey restrict the properties to only the public ones and the ones on instance-level.

I have a number of classes that derive from a class BaseClass where BaseClass just özgü an `Id property.

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

EDIT2: Kakım mentioned in the comments doing reflection within Equals or even GetHashCode is a bad idea birli it´s usually quite slow and sevimli often be avoided. If you know the properties to be checked for eqality at compile-time you should definitly include them within those two methods kakım doing so gives you C# IEqualityComparer Nasıl Kullanılır much more safety.

Eric's answer explains the root cause of the whole issue (in terms of covariance and contravariance).

1 @Boiethios Then you might introduce some dirty-flag that determinaes if your object was modified istead of constantly checking all properties if they are still same kakım what you have in the database.

C# ile veritabanlarına muvasala sağlayan icraat geliştirebilirsiniz. ADO.Kemiksiz gibi teknolojiler, veritabanı etkileşimini C# IEqualityComparer Nasıl Kullanılır kolaylaştırır.

I strongly disagree: the lecture was needed, and it was taken to heart. The code, kakım written, was bad, and based on bad work practice. Not pointing this out would C# IEqualityComparer Temel Özellikleri ve Kullanımı be a disservice, and hamiş at all helpful, since then the OP couldn’t improve how they work.

If things don't seem to be working C# IEqualityComparer Temel Özellikleri ve Kullanımı (such as duplicate key errors when doing ToDictionary) put a breakpoint inside Equals to make C# IEqualityComparer nerelerde kullanılıyor sure it's being hit and make sure you have GetHashCode defined (with override keyword).