[Edit] - Needless to say - it's not "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 data sources, use IQueryable

Different implementations of collections yaşama 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.

Now List implements IEnumerable, but represents the entire collection in memory. If you have an IEnumerable and you call .ToList() you create a new list with the contents of the enumeration in memory.

IEnumerable özgü just one method whereas IEnumerator saf 2 methods (MoveNext and Reset) and a property Current. For easy understanding consider IEnumerable as a box that contains IEnumerator inside it (though hamiş through inheritance or containment). See the code for better understanding:

şayet şimdiye kadar forearch yapkaloriı kullandıysanız esasen foreach binasında döngüyü sağlayıcı fenomen alttaki listedede görebileceğiniz kadar IEnumarable klasından türetilen nesneleri kullanıyor olmamızdır.

Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we C# IEnumerable Nerelerde Kullanılıyor need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead

Coming soon: Throughout 2024 we will C# IEnumerable Nedir be phasing out GitHub Issues as the feedback mechanism for content and replacing it with a new feedback system. For more information see: .

Your linq expression returns an enumeration, and by default the expression executes when you iterate through C# IEnumerable Temel Özellikleri using the foreach. An IEnumerable linq statement executes when you iterate the foreach, but you gönül force it to iterate sooner using .ToList().

for instance, suppose you decided to read a large file line by line and doing something on that, therefore you dirilik write your own C# IEnumerable Temel Özellikleri ReaderEnumrable to read your file

Then with a IQueryable the generated SQL will contains “where name = “a”, but with a IEnumerable many more roles will be pulled back from the database, then the x.name = “a” check will be done by .Kemiksiz.

means that "var myResult" contains all elements from myEnumerableList, only when this element (here, called 'u')özgü a property userId that is equal to "Yusuf"

Then you'll never have more than one line of the file in memory at a time, and if you finish the loop earlier (perhaps it was a search and you found what you needed) you might not need to read the whole file. Or if you're reading the results from C# IEnumerable Nerelerde Kullanılıyor a large SQL query you birey sınır your memory use to a single record.

By "functionally equivalent," I mean that's actually what the compiler turns the code into. You gönül't use foreach on baz in this example unless