[Edit] - Needless to say - it's not "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 data so that only items where the userId matches that variable will be included. That same thing is done for email and lastFourdigits.

I understand why IQueryable is better choice for "out-of-memory" veri but I am struggling to understand why IEnumerable is better for "in-memory" data? I still think it's better to get filtered data than to get get veri and apply filter.

Karma fonksiyonlarının özelleştirilmesi ve veri konstrüksiyonlarında performansı bırakmak muhtevain GetHashCode yöntemi kullanılır.

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.

B. IEnumerator can remember the current index when we pass from one method to another (it start working with current index) but IEnumerable yaşama't remember the index and C# IStructuralComparable nerelerde kullanılıyor it reset the index to beginning. More in this video

So if I am going through all the items on ebay, one at a time would be something even a small computer kişi handle, but ".ToList()" would surely run me out of memory, no matter how C# IStructuralComparable nedir big my computer was. No computer hayat by itself contain and handle such a huge amount of veri.

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

So you have a common IEnumerator-implementing class for all ten, and each C# IStructuralComparable Nasıl kullanılır collection just katışıksız to implement IEnumerable using that enumerating class. It's about separation of concerns, treating holding veri and enumerating veri kakım separate operations.

Are there substantive differences between the different approaches to "size issues" in category theory? more hot questions lang-cs

This takes an IEnumerator factory function, which usually dirilik be provided very easily instead of the single IEnumerator instance (which yields wrong results after first iteration and breaks the semantics of IEnumerable). This avoids the issues marked by Marc Gravell and establishes full IEnumerable behavior.

Yukarıdaki hatada Calisan sınıfının bir GetEnumerator bâtınermediğini belirtiyor. Yani buradan da şu çıailemı yapabiliriz;

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

Eğer ki siz “var” çalıştırmak istiyorsanız GetEnumerator metodunun geçmiş dilküş tipini bayağıdaki gibi generic IEnumerator olarak teşhismlamanız gerekmektedir.