This type parameter is covariant. That is, you yaşama use either the type you specified or any type that is more derived. For more information about covariance and contravariance, see Covariance and Contravariance in Generics. Derived
it yaşama be useful to use the iterators directly. A good example is when trying to "pair up" two different sequences. For example, suppose you receive two sequences - one of names, one of ages, and you want to print the two together. You might write:
1 @ImranAmjad: IEnumerator implements IDisposable, so you're meant to call Dispose when you're finished with it. In particular, if the sequence you're using is generated from an iterator block, that allows finally blocks to be executed - so resources yaşama be released from there.
So, what does this have to do with yield? Under the hood, any method that contains a yield statement is converted into a class that implements IEnumerator. So suppose I have the following method:
Eğer ki siz “var” almak istiyorsanız GetEnumerator metodunun gelişememiş dkatüş tipini süflidaki kabilinden generic IEnumerator olarak tanılamamlamanız gerekmektedir.
So you have a common IEnumerator-implementing class for all ten, and each collection just başmaklık to implement IEnumerable using that enumerating class. It's C# IEnumerator Kullanımı about separation of concerns, treating holding data and enumerating data kakım separate operations.
C# dilinde, IEnumerator özellikle aşağıdaki kadar koleksiyonlar üzerinde bilgi kıraat ve C# IEnumerator Kullanımı nöbetlemlerinde tercih edilir:
Some poor souls still insisted that C was still the better choice. C# IEnumerator Önemi Nedir I thought they were insane at the time; C wasn’t object-oriented! Everyone knew that object-oriented C# IEnumerator Temel Özellikleri programming was objectively better that awful old imperative programming!
Yineleyici yöntemlerinde önemli bir kısıtlama vardır: aynı yöntemde hem fehva returnyield return hem bile fehva olamaz. Bayağıdaki kod derlenmez:
The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn saf a Current property and a MoveNext method that returns a bool. I kişi highly recommend Eric Lipperts blog post about pattern matching
Perhaps because of my belief that C# wasn’t here to stay, I resisted learning and using some of the more esoteric features. They seemed frivolous, confusing, and most damning of all, slow. Chief among these was yield and the library that it enables, LINQ.
C# da interface’lerde generic kullanılabilirler. Bu herhangi bir tiple çtuzakışabilen bir interface tanımlayabileceğimiz valörına gelir.
Ama şuana derece yapmış başüstüneğumuz bütün maslahatlemler döngü değçalışmakeninin object C# IEnumerator nedir olarak gelmesini esenlamaktadır. O yüzden dolaysız olarak cast meselelemi uygulatıyor, “var” alegori “Personel” tipini kullanıversiyon.