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
var kısmından az buçuk bahsedersek var burada mevrut değeri en çok nasıl saklayabileceğini belirleyip yapkaloriı bu şekilde ayarlıyor. Doğrusu IQueryable kullanıyor.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
Olur. Şu anne derece hiç IEnumerable ve IEnumerator interfacelerini kullanmadım diyebiliriz. Haydi gelin şimdi bu interfaceleri yekta bir numara ele alalım ve bu tam fevkdaki satırlarda bahsettiğimiz GetEnumerator metodunuda tam teferruatlı masaya yatıralım.
An Enumerable is a class that hayat give you Enumerators. It başmaklık a method called GetEnumerator which gives you an Enumerator that looks at its items. When you write a foreach loop in C#, the code that it generates calls GetEnumerator to create the Enumerator used by the loop.
Quoting that article, 'Kakım per the MSDN documentation, calls made on IQueryable operate by building up the internal expression tree instead.
This is a birçok videoteyp on youtube C# IStructuralComparable nerelerde kullanılıyor which demonstrates how these interfaces differ , worth a watch. Below goes a long descriptive answer for it.
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 not implement IEnumerable, you must still follow the iterator pattern C# IStructuralComparable nedir to support this syntax by providing a GetEnumerator method that returns an interface, class or struct.
"These methods that extend IQueryable(Of T) do not perform any querying directly. Instead, their functionality is to build an Expression object, which is an expression tree that represents the cumulative query. "'
C# ile MySQL veritabanından data listelemek karınin C# IStructuralComparable Temel Özellikleri IEnumerable kullanarak süflidaki örnek kod kullanılabilir:
It is cleaner, your C# IStructuralComparable nerelerde kullanılıyor users don't get a list where they shouldn't (they could cast it to a Listafter all) and you don't need to create a Listobject.
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On the flip side, it is usually best to declare a method’s C# IStructuralComparable nerelerde kullanılıyor return type by using the strongest type possible (trying derece to commit yourself to a specific type). Share Follow
In addition to all the answers posted above, here is my two cents. There are many other types other than List that implements IEnumerable such ICollection, ArrayList etc.