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
Bu iki arayüzün yararlanma senaryoları farklıdır ve birbirlerinin namına kullanılmamalıdır. Bu makalede, IEnumerable ve IQueryable arasındaki farkları inceleyeceğiz.
Different implementations of collections dirilik 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.
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.
Basically it başmaklık a method to get the next item in the collection. It doesn't need the whole collection to be in memory and doesn't know how many items are in it, foreach just keeps getting the next item until it runs out.
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
Koleksiyonlar Arasında Gezinmeyi Esenlar: IEnumerable, koleksiyonlar ortada kolay gezinmenizi katkısızlar. GetEnumerator metodu ile koleksiyonun her bir elemanına erişebilir ve bu elemanlar üzerinde muamelat yapabilirsiniz.
Bu alanda veya başka bir alanda, benim ve diğer yardımcı insanoğluın paylaşımlarına lütfen acizliğiniz ve ezikliğinizle yaklaşmayınız. İzin istemek, benim hükmüm şeşna girmeniz mazmunına gelmemektedir.
I do have one question though. In the first example you loop over the array using foreach but then you cannot do it in the second example. Is this because the array C# IEnumerable Nasıl Kullanılır is in a class or because it contains objects?
" This is false, because the where clause is getting called on an IEnumerable and that only knows how to loop through objects which are already coming from the database. If you made the return of AllSpotted() and the parameters of C# IEnumerable Nasıl Kullanılır Feline() and Canine() into IQueryable, then the filter would happen in SQL and this answer would make sense.
I think if your newly implemented class just behaves the sameway as a list does, there is no need to implement C# IEnumerable Temel Özellikleri it. If you need some kind of custom logic, it depends on what you want to do; you sevimli inherit list or you kişi implement IEnumerable. It just depends what C# IEnumerable Nerelerde Kullanılıyor is to be achieved.
IEnumerator kullanarak, koleksiyonun tamamını belleğe yüklemeden, yalnızca lazım elemanları aksiyonler ve bu sayede belleğin çalışan kullanılmasını sağlar.
When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. C# IEnumerable Kullanımı For example, if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using an interface such kakım IEnumerable rather than using a strong veri type such bey List or even a stronger interface type such bey ICollection or IList: