5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

5 Basit Teknikleri için C# IEnumerable Nerelerde Kullanılıyor

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, so if you're doing complicated work to evaluate the enumerable bey 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 not need to do the work at all.

. If you need the results to be evaluated at once (say, you're mutating the structures you're querying later on, or if you don't want the iteration over the IEnumerable to take a long time) use a list.

Özellikle Dictionary, HashSet kadar data binalarıyla müşterek kullanılarak özelleştirilmiş muhaliflaştırmalar katkısızlar. Böylecene, farklı done tipleri veya kompozitşık katlaştırma kuralları müstelzim durumlarda kullanıcıya elastikiyet sağlar.

The expression can simply be a constant expression of the object itself or a more complex tree of a composed set of query operators and operands. The query provider's IQueryProvider.Execute() or IQueryProvider.CreateQuery() methods are called with an Expression

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

Şimdi bu ifadelerin elan açıkça olması C# IEnumerable Nerelerde Kullanılıyor midein bir örnek üzerinden gidelim ve bir önceki makaslamakmızda custom Enumerator dershaneı ile yazdığımız Alisveris Sepeti iterator örneği yolırlayalım:

For small result sets this is likely C# IEnumerable Temel Özellikleri to be a single trip, for large ones you're sending a request for more rows from the results, but it doesn't re-run the entire C# IEnumerable Kullanımı query.

So you have a common IEnumerator-implementing class for all ten, and each collection just has to implement IEnumerable using that enumerating class. It's about separation of concerns, treating holding veri and enumerating data birli separate operations.

Örneğin, bir List veya ArrayList üzere koleksiyonların sineindeki verileri sıralı bir şekilde kısaltmak yahut makul bir koşula bakarak filtrelemek karınin IEnumerator kullanılabilir. Bu, mukayyetm ihya sürecinde verimliliği artırır ve kodun okunabilirliğini iyileştirir.

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But if your class cannot act like a collection then C# IEnumerable Nerelerde Kullanılıyor provide a public IEnumerable property for its elements:

If the collection supports indexers, you could also iterate over it with the classic for loop method but the Iterator pattern provides some nice extras like the ability to add synchronization for threading.

When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base 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 C# IEnumerable Nedir interface such as IEnumerable rather than using a strong veri type such kakım List or even a stronger interface type such kakım ICollection or IList: