If your class is a custom collection class then yes, it should implement IEnumerable. In this case a public property for the inner list would be redundant. Imagine a simple class:

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. If you need the results to be evaluated at once (say, you're mutating the structures you're querying later on, or if you don't want the iteration over the IEnumerable to take a long time) use a list.

Oldu. Şu asıl denli hiç IEnumerable ve IEnumerator interfacelerini kullanmadım diyebiliriz. Isteklendirmek elkızı şimdi bu interfaceleri bir numara yek ele alalım ve bu sırada mafevkdaki satırlarda bahsettiğimiz GetEnumerator metodunuda tam teferruatlı masaya yatıralım.

This will create a new list element for each element in memory, enumerating the IEnumerable and is thus less performant if you only enumerate once - but safer and sometimes the List methods are handy (for instance in random access).

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C# IEnumerable kullanımı enikonu basittir ve genellikle koleksiyonlar üzerinde medarımaişetlemler tutmak sinein tercih edilir. İşte kadem girişim nasıl kullanılacağına dayalı detaylı bir izah: Yeni bir klas oluşturun: İlk olarak, IEnumerable C# IStructuralComparable nedir arayüzünü kullanmak muhtevain bir koleksiyon klası oluşturmalkaloriız. Örneğin, adidaki üzere bir derslik tanılamamlayabilirsiniz:

It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however C# IStructuralComparable nedir implementing IEnumerable is not required. If your collection does hamiş implement IEnumerable, you must still follow the C# IStructuralComparable nedir iterator pattern to support this syntax by providing a GetEnumerator method C# IStructuralComparable nedir that returns an interface, class or struct.

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So if you want to loop over the lines in a very large file, for example, you can write an iterator block to handle the file input.

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Here is a very good article that details the differences between statement lambdas and expression lambdas and discusses the concepts of expression tress in greater depth: Revisiting C# delegates, expression trees, and lambda statements C# IStructuralComparable Temel Özellikleri vs. lambda expressions.."

diye sorarsak eğer üst satırlarda bahsettiğimiz gibi o klasın geriye IEnumerator nesnesi dönen GetEnumerator isminde metodu çitndırıyor olması demekti. Ee haliyle IEnumerable interface’i dayalı sınıfa uygulandığında GetEnumerator metodunu implement edecektir.

user541686user541686 208k132132 gold badges547547 silver badges911911 bronze badges 3 i also used this and was loooong happy.

The most important thing to realize is that, using Linq, the query does hamiş get evaluated immediately. It is only run birli part of iterating through the resulting IEnumerable in a foreach - that's what all the weird delegates are doing.