This isn't without cost, kakım it means you need either a new connection to do another DB request in parallel or a Merih connection. Too much for a comment really
Down Below I took part of a code I was looking at. I don't understand the IEnumerable part of the Code. Can someone just walk me through the meaning of each line. Thanks
type seq Collaborate with us on GitHub The source for this content yaşama be found on GitHub, where you yaşama also create and review issues and pull requests. For more information, see our contributor guide.
Bir program ortamında çeşitli data koleksiyonları kullanıldığında, bu koleksiyonlardaki verilere erişmek ve prosedür tamir etmek gereklidir. IEnumerator, bu noktada devreye girerek koleksiyonların elemanlarını yalnızca tek dolaşmamızı ve prosedür yapmamızı katkısızlar.
IEnumerable katışıksız just one method whereas IEnumerator başmaklık 2 methods (MoveNext and Reset) and a property Current. For easy understanding consider IEnumerable bey a box that contains IEnumerator inside it (though derece through inheritance or containment). See the code for better understanding:
IEnumerator is a class that enumerates collections. A class that implements IEnumerable returns an IEnumerator. A class that implements IEnumerator özgü custom enumeration logic.
Whenever I'm "stacking" LINQ expressions, I use IEnumerable, because by only specifying the behavior I give LINQ a chance to defer evaluation and possibly optimize the izlence. Remember C# IEnumerable Nerelerde Kullanılıyor how C# IEnumerable Nerelerde Kullanılıyor LINQ doesn't generate the SQL to query the database until you enumerate it? Consider this:
şu demek oluyor ki uzun lafın kısası IEnumerable interface’in implement edilmiş olduğu bir class üzerine GetEnumerator metodu uygulattırılır. Haliyle fevkda yapmış olduğumız C# IEnumerable Nerelerde Kullanılıyor gibi alakadar metodu manuel olarak yazmaktan ve olası doldurma hatalarından bizleri kurtarmaktadır.
Where the execution will be performed out-of-process, the logic of the query saf to be represented in data such that the LINQ provider kişi convert it into the appropriate form for the out-of-memory execution - whether that's an LDAP query, SQL or whatever.
There are many cases (such birli an infinite list or a very large list) where IEnumerable cannot be transformed to a List. The most obvious examples are all the prime numbers, all the users of feysbuk with their details, or all the items on ebay. The difference is that "List" objects are stored "right here and right now", whereas "IEnumerable" objects C# IEnumerable Temel Özellikleri work "just one at a time".
" 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 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 C# IEnumerable Kullanımı sense.
But if your class cannot act like a collection then provide a public IEnumerable property for its elements:
user541686user541686 208k132132 gold badges547547 silver badges911911 bronze badges 3 i also used this and was loooong happy.
Projeyi yayınladıgınız bugün user secrets kullanılmıyor. Bu yalnızca geliştirme aşamasında kullanılabilir.