IEnumerable bütün verileri alıp memory bile tutarak, sorgulama maslahatlemlerini memory üzerinden yaparken IQueryable ise şartlara ilgilı query oluşturarak aracısız veritabanı üzerinden sorgulama ustalıklemi yapar.
Down Below I took part of a code I was looking at. I don't understand the IEnumerable part of the Code. Yaşama someone just walk me through the meaning of each line. Thanks
Different implementations of collections emanet be enumerable; using IEnumerable makes it clear that what you're interested in is the enumerability, and hamiş 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.
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.
IEnumerable ve IEnumerator interfaceler’i ile sizlerde oluşturduğunuz sınıflara itere özellikleri kazandırabilir, ayrıca IEnumerator interface’i ile oluşturduğunuz enumerator’de isteğinize gereğince iterasyonun periyodunu ayarlayabilir ve foreach döngüsünde kullanabilirsiniz.
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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 hamiş 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.
So you have a common IEnumerator-implementing class for all ten, and each collection just özgü to implement IEnumerable using that enumerating class. It's about separation of concerns, treating holding veri and enumerating data bey separate operations.
Bu soruya yalnızca kayıtlı kullanıcılar karşılık yazabilirler. Yanıt kaydetmek dâhilin lütfen giriş dokumanız.
" This is false, because the where clause is getting called on an IEnumerable C# IEnumerable Kullanımı and that only knows how to loop through objects which are already coming from the database. If you made the return of AllSpotted() and the parameters of Feline() and Canine() into IQueryable, then the filter would happen in SQL and this answer would make sense.
Expression trees are a very important construct in C# and on the .Kemiksiz ortam. (They are important in general, but C# makes them very useful.) To better C# IEnumerable Kullanımı understand the difference, I recommend reading about the differences between expressions
Joel CoehoornJoel Coehoorn 410k114114 gold badges576576 silver badges808808 bronze badges 3 3 The key of IEnumarable is that the backing collection is hamiş enumerated until specifically expanded, be it a foreach or accessor via an indexer. Unfortunately IEnumarable seems to be blindly used as the lowest interface which now causes problems with asynchronous data manipulation (e.
When declaring a method’s parameter C# IEnumerable Nasıl Kullanılır types, you should specify the weakest type possible, preferring interfaces over base C# IEnumerable Nedir 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 birli IEnumerable rather than using a strong veri type such bey List C# IEnumerable Nasıl Kullanılır or even a stronger interface type such kakım ICollection or IList: