IEnumerable bütün verileri aldatmaıp memory de sara, sorgulama mesleklemlerini memory üzerinden yaparken IQueryable ise şartlara bağlamlı query oluşturarak doğrudan veritabanı üzerinden sorgulama maslahatlemi yapar.
are two properties in particular—one that points to a query provider (e.g., a LINQ to SQL provider) and another one pointing to a query expression representing the IQueryable object birli a runtime-traversable abstract syntax tree that can be understood by the given query provider (for the most part, you dirilik't give a LINQ to SQL expression to a LINQ to Entities provider without an exception being thrown).
This where filter is executed on the client side where the IEnumerable code is. In other words all the veri is fetched from the database and then at the client its scans and gets the record with EmpId is 2.
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
Bu çalışmalemleri tamamladıktan sonrasında foreach içerisinde şirket sınıfını kullanmayı denersek yanlış vermeyecektir.
The "inner" member does not have "Animal" instances in it, but rather "Species" instances, which was very strange for me. The "outer" member does contain "Animal" instances. I C# IEnumerable Kullanımı presume that the two delegates determine which goes in and what goes out of it?
It is a best practice to C# IEnumerable Nasıl Kullanılır 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 to support this syntax by providing a GetEnumerator method that returns an interface, class or struct.
"These methods that extend IQueryable(Of T) do hamiş perform any querying directly. Instead, their functionality is to build an Expression object, which is an expression tree that represents the cumulative query. "'
Örneğin, bir List veya ArrayList üzere koleksiyonların muhtevaindeki verileri sıralı bir şekilde bürümek veya sınırlı bir koşula bakılırsa filtrelemek bağırsakin IEnumerator kullanılabilir. Bu, mukayyetm geliştirme sürecinde verimliliği fazlalıkrır ve kodun okunabilirliğini iyileştirir.
Bu yöntemler sayesinde, ölçün kontralaştırma mantığını değişçiliktirerek özel ustalıklemler yapabilir ve uygulamanızın performansını ve doğruluğunu pozitifrabilirsiniz.
But if your class cannot act like a collection then provide a public IEnumerable property for its elements:
Reed CopseyReed Copsey 561k7979 gold badges1.2k1.2k silver badges1.4k1.4k bronze badges 3 2 I agree strongly with your point about decoupling from the implementation, but I also think there's a point for making clear the expected C# IEnumerable Nasıl Kullanılır usage; even if I have a List, referring to it birli IEnumerable makes it clear that the functionality I'm expecting from the collection in that usage is the enumerability functionality, and derece any of the other List functionality.
When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. For example, if you are writing a method that manipulates a collection of items, it would C# IEnumerable Temel Özellikleri be best to declare the method’s parameter by using an interface such bey IEnumerable rather than using a strong veri type such birli List or even a stronger interface type such C# IEnumerable Temel Özellikleri as ICollection or IList: