5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

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[Edit] - Needless to say - it's hamiş "either this or that". often it would make good sense to use both a list and an IEnumerable in the same class. No computer in the world could list all prime numbers, because by definition this would require an infinite amount of memory. But you could easily think of a class PrimeContainer which contains an IEnumerable primes, which for obvious reasons also contains a SortedList _primes.

So when you have to simply iterate through the in-memory collection, use IEnumerable, if you need to do any manipulation with the collection like Dataset and other veri sources, use IQueryable

Different implementations of collections sevimli be enumerable; using IEnumerable makes it clear that what you're interested in is the enumerability, and derece the structure of the underlying implementation of the collection.

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Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do 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 derece required. If your collection does derece implement IEnumerable, you must still follow the iterator pattern to support this C# IEnumerable Kullanımı syntax by providing a GetEnumerator method that returns an interface, class or struct.

IEnumerable describes behavior, while List is an implementation of that behavior. When you use IEnumerable, you give the compiler a chance to defer work C# IEnumerable Nerelerde Kullanılıyor until later, possibly optimizing along the way. If you use ToList() you force the compiler to reify the results right away.

Örneğin, bir List yahut ArrayList kadar koleksiyonların muhtevaindeki verileri sıralı bir şekilde temizlemek veya belirli bir koşula gereğince filtrelemek dâhilin IEnumerator kullanılabilir. Bu, yazılı sınavm geliştirme sürecinde verimliliği fazlalıkrır ve kodun okunabilirliğini iyileştirir.

" This is false, because the where clause is getting called on an IEnumerable and that only knows how to C# IEnumerable Nasıl Kullanılır loop through objects which are already coming from the database. If you made the return of AllSpotted() and the parameters of Feline() and Canine() into IQueryable, C# IEnumerable Nerelerde Kullanılıyor then the filter would happen in SQL and C# IEnumerable Nedir this answer would make sense.

Want to improve this question? Update the question so it focuses on one problem only by editing this post.

If the collection supports indexers, you could also iterate over it with the classic for loop method but the Iterator pattern provides some birçok extras like the ability to add synchronization for threading.

You should still avoid declaring the parameter type birli List. Using IList allows the caller to pass arrays and any other objects whose type implements IList.