C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

C# IEqualityComparer nerelerde kullanılıyor Üzerinde Buzz söylenti

Blog Article

is time to be happy. I’ve read this post and if I could I desire to suggest you few interesting things

GitHub'da bizimle ortaklık dokuman Bu derunğin kaynağı GitHub'da bulunabilir; burada ayrıca problemlerı ve çekme isteklerini oluşturup gözden geçirebilirsiniz. Daha bir tomar malumat yürekin katkıda kâin kılavuzumuzu inceleyin.

Birli far kakım best practices around using this interface for your own purposes. I would say that the best practice would be to use it when you are deriving or implementing a class that saf similar functionality to the above mentioned .

CodeFuller's answer will work fine, but kakım an alternative option, you could use MoreLINQ and its DistinctBy method, which would avoid you needing to create a separate class at all:

The first is the idea of precise equality. Given two references to objects, do the two references point to the same location in memory? Programming languages are suited for this kind of comparison, and .Safi comes with many prebuilt operators to handle this case.

örnek olarak form1’de textboxa eklenen metnin butona edisyonldığında form2 deki textboxa eklenmesi bâtınin;

What US checks and balances prevent the FBI from raiding politicians unfavorable to the federal government?

There are multiple ways to tackle this and tell LINQ how the objects should be compared to each other. I will cover the use of IEqualityComparer. The interface contains two methods:

More importantly, I have stepped into the trap of thinking that objects, which I use in my code, hayat be only partially relevant to me, while in case we do OOP every object must be considered in its entirety (things like SOLID help us with that.) This way, when implementing C# IEqualityComparer Nasıl Kullanılır the IEqualityComparer interface I should have paid more attention to the presence of GetHashCode(..) method. This would solve my sorun at once, because it is this same method that LINQ uses when asked to extract distinct objects and perform other equality related operations (see Kaş operators in this article). To verify this we add a debug message to the method and observe several C# IEqualityComparer nerelerde kullanılıyor calls to it:

Is there a preferred way of testing two instances of T for equality, or are there several equally valid ways?

Örnekte, kullanıcıların hemayar olup olmadığını kontrolör ederken kullanıcı adları dikkate münfailtır.

The Equals(T, T) method C# IEqualityComparer Nasıl Kullanılır is reflexive, symmetric, and transitive. That is, it returns true if used to compare an object with itself; true for two objects x and y if C# IEqualityComparer Temel Özellikleri ve Kullanımı it is true for y and x; and true for C# IEqualityComparer Temel Özellikleri ve Kullanımı two objects x and z if it is true for x and y and also true for y and z.

What Distinct() actually does here is comparing object references. So our second George Clooney is in fact an independent object (since it was created independently) and its reference differs from the reference of the first one - therefore it appears in the output twice:

Eşya sıfır dershane ve gestaltlar, birincil mimarilandırıcı parametreleri sinein her devran bu davranışı istemeyebilir.