Burada enum kümesinde sıfır bir elemana erişmek isteriz. Runtime da hiç bir mesele gerçekleşemez ve bizlere sayısal değeri yahut olması gereken sayısal değeri döner , sakatlık bulunduğunun üstelikına varmayız. Gene de kontrol etmekte fayda var :)
Expose via static property — makes the comparer class private and generates a static property that exposes the comparer class to consumers.
If a reference is no longer publicly available, should you include the proofs of the results you cite from it?
When writing programs in C# with the help of LINQ I have come across the IEqualityComparer generic interface several times. The name conveys the purpose of the interface clearly, still, surprisingly, my first attempts to apply it were marked by strong confusion - the thing merely didn't work the way I wanted it to. Moreover, after going to Google and StackOverflow I have noticed that I'm derece the only one to face difficulties with it.
IEqualityComparer is an interface for an object that performs the comparison on two objects of the type T.
However, like you said in the conclusion, you gönül achieve the same result with an expression like that:
Bu sorunlemden sonra bayağıdaki cam rağmenıza gelecektir. Burada Local resource seçeneğini seçerek Import butonuna matbuat.
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, birey 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 the IEqualityComparer interface I should have paid more attention to the presence of GetHashCode(..) method. This would solve my C# IEqualityComparer Temel Özellikleri ve Kullanımı problem at once, because it is this same method that LINQ uses when asked to extract distinct objects and perform other equality related operations (see Set operators in this article). To verify this we add a debug message to the method and observe several calls to it:
Is there a preferred way of testing two instances of T for equality, or are there C# IEqualityComparer nedir several equally valid ways?
Örnekte, kullanıcıların denktaş olup olmadığını muayene ederken kullanıcı adları dikkate münfailtır.
Good news is that this same Distinct() method works for collections of our C# IEqualityComparer Nasıl Kullanılır custom objects too. So if George Clooney accidentally creeps into our collection twice that's not a sıkıntı:
What Distinct() C# IEqualityComparer Kullanımı actually does here is comparing object references. So our second George Clooney is in fact an independent object C# IEqualityComparer Kullanımı (since it was created independently) and its reference differs from the reference of the first one - therefore it appears in the output twice:
Equals/GetHashCode not only internalizes comparison logic, but also globalize them. There might be cases where I would like internal comparison (not using collection) for just one time.