The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does hamiş, at least hamiş in general terms for those of us who don't work in the secret labs of Microsoft.
var kısmından azıcık bahsedersek var burada gelen değeri en yerinde nasıl saklayabileceğini belirleyip yapkaloriı bu şekilde ayarlıyor. Yani IQueryable kullanıyor.
Different implementations of collections can 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.
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
The syntax (which you rarely see because there are prettier ways to do it) for moving through C# IEnumerable Temel Özellikleri a collection that implements IEnumerable is:
IQueryable allows for out-of memory things like a remote data source, such kakım a database or web C# IEnumerable Nerelerde Kullanılıyor service.
To begin examining the process of implementing existing .Safi interfaces, let’s first look at the role C# IStructuralComparable Kullanımı of
but this violates the IEnumerable semantics and the time came when I got wrong results. so switched to orderly creating a fresh iterator instance (see my answer)
Doğrusu IEnumerable yapısında filtreleme anlayışlemleri memory de bünyelırken, IQueryable da veritabanından direk filtrelenmiş verileri elde ederiz.
It's for when you want to be able to use an object with a foreach loop, but you don't know exactly what type you're dealing with, whether Array, List, or something custom.
There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and gönül perform all kinds of computations before C# IStructuralComparable Kullanımı and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).
On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying hamiş to commit yourself to a specific type). Share Follow
You should still avoid declaring the parameter type kakım List. Using C# IStructuralComparable nedir IList allows the caller to pass arrays and any other objects whose type implements IList.