The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does not, at least hamiş in general terms for those of us who don't work in the secret labs of Microsoft.
, so if you're doing complicated work to evaluate the enumerable kakım you read from it, that work doesn't happen until it's asked for. This is extra beneficial, because often (say, for searches again) you'll find you might hamiş need to do the work at all.
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C# IEnumerable kullanımı oldukça basittir ve çoğunlukla koleksiyonlar üzerinde aksiyonlemler sahip olmak ciğerin tercih edilir. İşte hamle etap nasıl kullanılacağına konusunda detaylı bir tavzih:
(kakım per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you birey't really do - for example, it is hoped
B. IEnumerator gönül remember the current index when we pass from one method to another (it start working with current index) but IEnumerable güç't remember the index and it reset the index to beginning. More in this video
So the difference between IQueryable and IEnumerable is about where the filter logic is executed. One executes on the client side and the other executes on the database.
It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual C# IStructuralComparable nerelerde kullanılıyor Basic) syntax, however implementing IEnumerable is not 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.
Your linq expression returns an enumeration, and by default the expression executes when you iterate through using the foreach. An IEnumerable linq statement executes when you iterate the foreach, but you yaşama force it to iterate sooner using .ToList().
Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 1 The mistake with "Reset" C# IStructuralComparable Temel Özellikleri 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 an exception; an ordinary IEnumerable whose collection was modified should be allowed to return 'sensible' veri if it's C# IStructuralComparable nerelerde kullanılıyor able to do so or throw an exception if it yaşama't, and an ISafeEnumerable, which would be expected to C# IStructuralComparable Kullanımı work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.
" This is C# IStructuralComparable Nasıl kullanılır false, because the where clause is getting called on an IEnumerable 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.
diyerek sorarsak eğer üst satırlarda bahsettiğimiz kadar o dershaneın geriye IEnumerator nesnesi dönen GetEnumerator isminde metodu barındırıyor olması demekti. Ee haliyle IEnumerable interface’i müntesip sınıfa uygulandığında GetEnumerator metodunu implement edecektir.
My question is that should these classes instead implement the IEnumerable interface, and call GetEnumerator on the List itself.
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