1 Writing code without knowing what it actually does is called cargo cult programming. It’s a surprisingly widespread practice. It fundamentally doesn’t work.
If you want a generic solution that creates an IEqualityComparer for your class based on a property (which acts bey a key) of that class have a look at this:
The same return value system applies as IComparer. The difference between this and IComparer is IComparable will be implemented on the class that contains your field values, while IComparable derived classes are used for custom sorting. So for example:
IEqualityComparer is an interface which is used to find whether an object is equal or hamiş. We will see this in a sample where we have to find the distinct objects in a collection. This interface will implement the method Equals(T obj1,T obj2).
Bu muamele ahir ilave etmek istediğinizi bilgisayarınızdaki konumundan seçerek Aç butonuna tıklayın.
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I am trying to generate a listbox of items that is a concatenation of two strings. I have created a class that implements IEqualityComparer C# IEqualityComparer nerelerde kullanılıyor and I want to make this list distinct.
RESTful web servisleri yahut SOAP tabanlı servisler oluşturarak öbür uygulamalarla etkileşimde bulunabilirsin.
So what happens when it comes time to actually deduce the type argument? We have two candidates: Position and BaseClass. Both satisfy the stated bounds. Position satisfies the first bound because it is identical to the first bound, and satisfies the second bound because it is smaller than the second bound.
Eric's answer explains the root cause of the whole issue (in terms of covariance and C# IEqualityComparer Nasıl Kullanılır contravariance).
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。
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Biz Box Listemizi istediğimiz şeylere gereğince kategorize etmek istediğimiz sinein kendimize bir kıstas belirlememiz gerekiyor bunu bizim bağırsakin IEqualityComparer Interface’i bünyeyor. Dictionary’imizi C# IEqualityComparer nedir oluştururken IEqualityComparer yardımıyla oluşturduğumuz Class’ın instance’sını ekliyoruz. Sonrasında Dictionary teker teker mevrut verilere bizim verdiğimiz algoritmaya bakılırsa bakıyor. Öncelik olarak oluşturduğumuz Class’da ki GetHashCode()’ a gidiyor oradan HashCode’u allıkıyor şayet önceki eklediği Key’lerde bu HashCode yoksa direkt olarak eklemesini binayor.
If things don't seem to be working C# IEqualityComparer Temel Özellikleri ve Kullanımı (such kakım duplicate key errors when C# IEqualityComparer nerelerde kullanılıyor doing ToDictionary) put a breakpoint inside Equals to make sure it's being hit and make sure you have GetHashCode defined (with override keyword).