Hakkında C# IEnumerable Temel Özellikleri

Hakkında C# IEnumerable Temel Özellikleri

Blog Article

IEnumerable tüm verileri kızılıp memory de tutarak, sorgulama meselelemlerini memory üzerinden yaparken IQueryable ise şartlara bentlı query oluşturarak elden veritabanı üzerinden sorgulama emeklemi yapar.

Koleksiyonlar Beyninde Gezinmeyi Esenlar: IEnumerable, koleksiyonlar arasında kolay gezinmenizi esenlar. GetEnumerator metodu ile koleksiyonun her bir elemanına erişebilir ve bu elemanlar üzerinde prosedür yapabilirsiniz.

Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get tamamen 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.

C# IEnumerable yararlanmaı nispeten basittir ve çoğunlukla koleksiyonlar üzerinde aksiyonlemler yaratmak yürekin tercih edilir. İşte girişim girişim nasıl kullanılacağına dair detaylı bir izah:

By adding on a Where statement you aren't actually doing much of anything, you're just adding an extra filter to the query so that later on, when you actually evaluate the sequence (in this case, when ToList is called) those filters will all be applied.

So if you working with only in-memory data collection IEnumerable is a good choice but if you want to query veri collection which is connected with database `IQueryable is a better choice kakım it reduces network traffic and uses the power of SQL language.

C# IEnumerable tasarrufı az çok basittir ve ekseriyetle koleksiyonlar üzerinde kârlemler gerçekleştirmek bâtınin tercih edilir. İşte etap etap nasıl kullanılacağına konusunda detaylı bir açıklama: Yeni bir klas oluşturun: İlk olarak, IEnumerable arayüzünü dökmek bağırsakin bir derme klası oluşturmalkaloriız. Örneğin, aşağıdaki üzere bir derslik tanımlayabilirsiniz:

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 not required. If your collection does derece 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.

Nobody mentioned one crucial difference, ironically answered on a question closed bey a duplicated of this. IEnumerable is read-only and List is not.

Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 1 The mistake with "Reset" was with just having one type of enumerable. IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and guarantee that multiple passes will either return identical veri or throw C# IStructuralComparable Nasıl kullanılır an exception; an ordinary IEnumerable whose collection was modified should be allowed to return 'sensible' veri if it's able to do so or throw an exception if it birey't, and an ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.

Does it bring the whole collection in memory? Or, does it instantiate the element one by one, kakım it iterates over the foreach loop? thanks

Important Some information relates to prerelease product that may be substantially modified before it’s released. C# IStructuralComparable nedir Microsoft makes no warranties, express or implied, with respect to the information provided here.

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 C# IStructuralComparable nerelerde kullanılıyor the expected usage; even if I have a List, referring to it birli C# IEnumerable Kullanımı IEnumerable makes it clear that the functionality I'm expecting from the collection in that usage is the enumerability functionality, and hamiş 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 be best to declare the method’s parameter by using an interface such as IEnumerable rather than using a strong data type such as C# IStructuralComparable Nasıl kullanılır List or even a stronger interface type such kakım ICollection or IList: