Detaylar, Kurgu ve C# IEnumerable Nerelerde Kullanılıyor

Detaylar, Kurgu ve C# IEnumerable Nerelerde Kullanılıyor

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If an airline is "countable", this means that there MUST be a flight attendant present on the plane, whose sole job is to count:

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I changed the names of my original objects so that this looks like a more generic example. The query itself is not that important. What I want to ask is this:

Analogy: Imagine you are a detective on an aeroplane . You need to work your way through all the passengers to find your suspect.

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.

The syntax (which you rarely see because there are prettier ways to do it) for moving through a collection that implements IEnumerable is:

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 yetişek. Remember how LINQ doesn't generate the SQL to query the database until you enumerate it? Consider this:

ServyServy C# IStructuralComparable Kullanımı 203k2727 gold badges342342 silver badges458458 bronze badges 1 @Jay thanks, just noticed that when re-reading.

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 dirilik force it C# IStructuralComparable Nasıl kullanılır to iterate sooner using .ToList().

for instance, suppose you decided to read a large file line by line and doing something on that, therefore you kişi write your own ReaderEnumrable to read your C# IEnumerable Nasıl Kullanılır file

Coming soon: Throughout 2024 we will be phasing out GitHub Issues kakım the feedback mechanism for content and replacing it with a new C# IStructuralComparable Temel Özellikleri feedback C# IStructuralComparable nedir system. For more information see: .

There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and yaşama perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).

On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying not to commit yourself to a specific type). Share Follow

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