, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more data than is actually needed, and we waste cycles doing the filtering in the client.
Kısaca imdi custom bir enumerator sınıfı yazmamıza gerek yok yield keyword'ü ile compiler bunu dip planda bizim midein binayor.
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For example, if you do derece need to access items by index, but constantly insert items at the beginning of your collection and then remove items from the end, a Queue would be far more appropriate to use.
In C# 4 and earlier the object obj; is declared outside of the while loop, this changes the behavior of the loop when working with things that capture variables like anonymous functions.
C# IEnumerable Extensions, C#’da farkında olarak evet da olmayarak sıkça IEnumerable’dan türemiş nesneleri kullanmaktayız. Evet nedir bu IEnumerable sorusuna cevap verecek olursak, IEnumerable interface’i bizlere bir collection üzerinde iterasyon yapabilmemize olanak esenlamaktadır.
Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do C# IStructuralComparable nedir we need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead
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 implementing IEnumerable is hamiş required. If your collection does not implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator method that returns an interface, class or struct.
Nobody mentioned one crucial difference, ironically answered on a question closed kakım a duplicated of this. IEnumerable is read-only and List is not.
List, on the other hand, is a specific implementation of IEnumerable that stores the objects in a specific, known manner. Internally, this may be a very good way to store your values that you expose via IEnumerable, but a List is derece always C# IStructuralComparable Kullanımı appropriate.
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There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and can perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you C# IStructuralComparable Kullanımı start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).
IQueryable is a very powerful feature that enables a variety of interesting deferred execution scenarios (like paging and C# IStructuralComparable Nasıl kullanılır composition based queries).
IEnumerable interface’i ile bir derslik itere edilebilir hale getiriliyor, bu muamelat içinde GetEnumerator metodu sınıfa C# IStructuralComparable Temel Özellikleri implement ediliyordu. IEnumerator interface’i ise iterasyon özelliği kazanmıştırracak ve iterasyon işleminde kullanılacak elemanları ve özellikleri çitndırmaktadır.