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
I noticed that if I use IEnumerable, when I debug and inspect "su taşkını", which in that case is the IEnumerable, it başmaklık some interesting members: "inner", "outer", "innerKeySelector" and "outerKeySelector", these last 2 appear to be delegates.
Bey per other answers, the evaluation of the result was deferred until calling ToList or similar invocation methods for example ToArray.
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.
To get them I use VisualTreeHelper class. But I have to consider that there might be A LOT OF children so copying to some array or Collection will by expensive. – drasto 5 mins ago
Quoting that article, 'Kakım per the MSDN documentation, calls made on IQueryable operate by building up the internal expression tree instead.
IEnumerable is a generic interface describing something that kişi be enumerated (you sevimli iterate through it and see/retrieve all of its elements). The content of this IEnumerable can have been pre-generated, or is live/lazily generated when you try to iterate through 'result' (IEnumerable).
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 derece implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator C# IEnumerable Nasıl Kullanılır method that returns an interface, class or struct.
"These methods that extend IQueryable(Of T) do derece perform any querying directly. Instead, their functionality is to build an Expression object, which is an expression tree that represents the cumulative query. "'
Kısaca IEnumerable kuruluşsında filtreleme davranışlemleri memory de gestaltlırken, IQueryable da veritabanından dikme filtrelenmiş verileri elde ederiz.
Kendi teşhismladığımız “Person” tipinden “Current” property’si.Hedefimiz gestaltcı metotla aldığımız collection üzerinde gezerken ele aldığımız nesneyi(Person) IEnumerator’dan gelen “Current” property’sine atmak,olası bir suç durumunda ise tıpkı collectionlarda başüstüneğu kadar “IndexOutOfRangeException” hatası fırlatmak.
IEnumerable is an interface that tells us that we C# IEnumerable Nerelerde Kullanılıyor sevimli enumerate over a sequence of T instances. If you need to allow somebody to see and perform some action for each object in a collection, this C# IEnumerable Temel Özellikleri is adequate.
RastoRasto 17.6k4848 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 C# IEnumerable Temel Özellikleri all the items inside your new enumerable, to handle enumerators that emanet only be enumerated once, so there C# IEnumerable Nedir is no general class for this in the runtime.
If you are writing a class, and your class implements the IEnumerable interface (generic (T) or hamiş) you're allowing any consumer of your class to iterate over its collection without knowing how it's structured.