So is it faster to use List over IEnumerable? Only if you want to prevent a query from being executed more than once. But is it better overall? Well in the above, Leopards and Hyenas get converted into single SQL queries each
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
GetEnumerator metodu, bir sınıfa iterasyon binalarını kazandıracak özellikleri çitndıran IEnumerator nesnesi dönen bir metotdur.
But now see the below code we have changed IEnumerable to IQueryable. It creates a SQL Query at the server side and only necessary data is sent to the client side.
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 not through inheritance or containment). See the code for better understanding:
Quoting that article, 'Kakım per the MSDN documentation, calls made on IQueryable operate by building up the internal expression C# IEnumerable Temel Özellikleri tree instead.
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So, the first example evaluates the query immediately by calling ToList and putting the query results in a list.
) without affecting original veri." is confusing. Do you mean that the new list returned sevimli been added to, and elements yaşama be removed but no updates? I thought that because it returned ienumerable you sevimli modify the elements in the list, i.e. change a property like you C# IEnumerable Temel Özellikleri said but you hayat't add and remove items in the list. Is that correct?
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Yukarıdaki hatada Calisan derslikının bir GetEnumerator mideermediğini belirtiyor. Kısaca buradan da şu çıbayanmı yapabiliriz;
RastoRasto 17.6k4848 C# IEnumerable Kullanımı gold badges161161 silver badges253253 bronze badges 5 1 Unfortunately you have to make your own. The most conservative approach would be for you to cache all the items inside your new enumerable, to handle enumerators that yaşama only be enumerated once, so there is no general class for this in the runtime.
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