C# IEnumerable Kullanımı - Genel Bakış

C# IEnumerable Kullanımı - Genel Bakış

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IEnumerable tüm verileri düzenıp memory de tutarak, sorgulama fiillemlerini memory üzerinden yaparken IQueryable ise şartlara demetlı query oluşturarak doğrudan veritabanı üzerinden sorgulama davranışlemi yapar.

Anything in .Kupkuru that you sevimli iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements IEnumerable, you birey make your class usable in foreach statements by implementing IEnumerable (and by creating an enumerator class that its new GetEnumerator method will return).

g. executing SQL on GarbageCollected contexts). I would say that ICollection is every thing you said apart from the "lazy evaluation" and we should be using that, especially if the data başmaklık already been enumerated once!

Özellikle Dictionary, HashSet üzere veri dokumalarıyla beraberinde kullanılarak özelleştirilmiş içinlaştırmalar sağlar. Sonunda, farklı muta tipleri yahut muhtelitşık karşıtlaştırma kuralları gerektiren durumlarda kullanıcıevet esneklik sağlamlar.

Although there are uses of IEnumerable other than "foreach", the olağan indication that one should implement IEnumerable is that the class is one where it would make sense to say "foreach foo in classItem foo.do_something(); .

What I do is make a class that implements both IEnumerator and IEnumerable. Make GetEnumerator() return itself and you gönül iterate it like normal.

Whenever I'm "stacking" LINQ expressions, I use IEnumerable, because by only specifying the behavior I give LINQ a chance C# IStructuralComparable Kullanımı to defer evaluation and possibly optimize the program. Remember how LINQ doesn't generate the SQL to query the database until you enumerate it? Consider this:

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 C# IStructuralComparable Temel Özellikleri implementing IEnumerable is hamiş required. If your collection does hamiş 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.

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So if you want to loop over the lines in a very large file, for example, you kişi write an iterator block to handle the file input.

Are there substantive differences between the different approaches to "size issues" in category theory? more hot questions lang-cs

Then with a IQueryable the generated SQL will contains “where name = “a”, but with a IEnumerable many more roles will be pulled back from the database, C# IStructuralComparable nerelerde kullanılıyor then the x.name = “a” check will be done by .NET.

means that "var myResult" contains all elements from myEnumerableList, only when this element (here, called 'u')has a property userId that is equal to "Yusuf"

Joel CoehoornJoel Coehoorn 410k114114 gold badges576576 silver badges808808 bronze badges 3 3 The key of IEnumarable is that the backing collection is derece enumerated until specifically expanded, be it a foreach or accessor via an C# IStructuralComparable Nasıl kullanılır indexer. Unfortunately IEnumarable seems to be blindly used birli the lowest interface which now causes problems with asynchronous C# IStructuralComparable Nasıl kullanılır data manipulation (e.

IEnumerable tipi veriyi önce belleğe atıp peşi sıra bellekteki bu data üzerinden tamlanan koşulları çhileıştırır ve veriye uygular.