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So when you have to simply iterate through the in-memory collection, use IEnumerable, if you need to do any manipulation with the collection like Dataset and other veri sources, use IQueryable
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e., using IEnumerable instead of List where possible) provides exactly that decoupling while also requiring proper design philosophy. That is to say, you kişi achieve decoupling but not achieve minimal dependency, but you cannot achieve minimal dependency without achieving maximal decoupling.
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(); .
The compiler performs pattern matching. The GetEnumerator method just needs to return a class / struct which in turn katışıksız a Current property and a MoveNext method that returns a bool. I yaşama highly recommend Eric Lipperts blog post about pattern matching
The primary difference is that the LINQ operators for IQueryable take Expression objects instead of delegates, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a method.
So, the C# IEnumerable Kullanımı first example evaluates the query immediately by calling ToList and putting the query results in a list.
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for instance, suppose you decided to read a large file line by line and doing something on that, therefore you birey write your own ReaderEnumrable to read your file
" C# IEnumerable Nedir This is false, because the where clause is getting called on an IEnumerable and that only knows how to loop through objects which are already coming C# IEnumerable Nasıl Kullanılır 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.
a reset C# IEnumerable Nedir on enumerators, but this is largely a design mistake and shouldn't be used (it is even a formal requirement in the spec that iterator blocks throw an exception if you call it).
Bu makalemızın ileri satırlarında C# IEnumerable Temel Özellikleri IEnumerator interface’ini detaylandırırken, kendi enumeratorümüzü oluşturmayıda bapşacağız. Ama şimdilik bu örneğimizde derlem yahut kol dokumalarının GetEnumerator metodunu kullanmamız meslekimizi yeterince görmektedir.
Bu metodun amacı garbage collector’ı beklemeden kullanılan referans tipi bileğişçilikkenleri sorunleri bittikten sonra ramden temizleyebilmektir.IEnumerable,IEnumerator interface’leri C# 2 ile birlikte gelmiş ve IEnumerable,IEnumerator interface’lerinden bırakıt alınmıştır.Vazıhçkakımı temelde aynı meselei yapmakla omuz omuza bu yazdıklarımı dikkate almış olduğunızda,generic mimariları kullanmanız daha sadık görünmektedir.