En iyi Tarafı C# IEnumerable Temel Özellikleri

En iyi Tarafı C# IEnumerable Temel Özellikleri

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[Edit] - Needless to say - it's derece "either this or that". often it would make good sense to use both a list and an IEnumerable in the same class. No computer in the world could list all prime numbers, because by definition this would require an infinite amount of memory. But you could easily think of a class PrimeContainer which contains an IEnumerable primes, which for obvious reasons also contains a SortedList _primes.

What this code is saying is that if userId was specified, then add a filter on the veri so that only items where the userId matches that variable will be included. That same thing is done for email and lastFourdigits.

Bey per other answers, the evaluation of the result was deferred until calling ToList or similar invocation methods for example ToArray.

For example, if you do derece need to access items by index, but constantly insert items at the beginning of your collection and then remove items from the end, a Queue would be far more appropriate to use.

Nihayetinde burada ortaya çısoy sonuç; IEnumerable interfaceinin uygulandığı sınıfa zorla GetEnumerator adlı metot implement ettirilmektedir. IEnumerator ise ilişkin sınıfa iterasyon teamülleminde kullanılacak elemanları ve özellikleri kazanmıştırrmaktan mesuliyetli olacaktır.

Basically it katışıksız a method to get the next item in the collection. It doesn't need the whole collection to be in memory and doesn't know how many items are in it, foreach just keeps getting the next item until it runs out.

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.

IEnumerable and IEnumerator are both interfaces. IEnumerable saf just one method called GetEnumerator. This method returns (as all methods C# IEnumerable Temel Özellikleri return something including void) another type which is an interface and that interface is IEnumerator. When you implement enumerator logic in any of your collection class, you implement IEnumerable (either generic or non generic).

IEnumerable describes behavior, while List is an implementation of that behavior. When you use IEnumerable, you give the compiler a chance to defer work C# IEnumerable Kullanımı until later, possibly optimizing along the way. If you use ToList() you force the compiler to reify the results right away.

By using IEnumerable in your API, you provide yourself the flexibility to change the internal implementation at any time without changing any other code

Here is a very C# IEnumerable Kullanımı good article that details the differences between statement lambdas and expression lambdas and discusses the concepts of expression tress in greater depth: Revisiting C# delegates, expression trees, and lambda statements vs. lambda expressions.."

a reset 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 C# IEnumerable Nerelerde Kullanılıyor call C# IEnumerable Kullanımı it).

My question is that should these classes instead implement the IEnumerable interface, and call GetEnumerator on the List itself.

Projeyi yayınladıgınız vakit user secrets kullanılmıyor. Bu yalnızca ihya aşamasında kullanılabilir.