[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.
In case of IEnumerable, only lines up to the element of interest will be read from the file. In case of ToList call over the enumerable, the entire file would be read before even starting the search.
Now the thing to note is that IEnumerable brought all the 5 records present in Salary table and then performed an in-memory filteration on the client side to get top 2 records. So more veri (3 additional records in this case) got transferred over the network and ate up the bandwidth unnecessarily.
There are many differences but let us discuss about the one big difference which makes the biggest difference. IEnumerable interface is useful when your collection is loaded using LINQ or C# IEnumerable Nerelerde Kullanılıyor Entity framework and you want to apply filter on the collection.
System.Collections.IEnumerator. This interface provides the infrastructure to allow the caller to traverse the internal objects contained by the IEnumerable-compatible container:
They usually have a GetXXX method that returns a IEnumerable of whatever C# IEnumerable Temel Özellikleri type the custom collection class uses so the internal collection yaşama be iterated around using a foreach loop.
Velhasıl… Yaptığımız bu emeklemler neticesinde “Personeller” sınıfımız, C# IEnumerable Nedir içinde bir “Personel” done kümesi barındıran ve C# IEnumerable Nedir bu veri kümesi üzerinde itere edilebilir bir nitelik arz fail bir klas mahiyetindedir.
C# IEnumerator kullanarak MySQL veritabanından veri çkol bu verileri DataGridView muayeneüne nasıl ekleyebileceğimizi gösteren örnek harf aşağıda önem almaktadır.
"These methods that extend IQueryable(Of T) do not perform any querying directly. Instead, their functionality is to build an Expression object, which is an expression tree that represents the cumulative query. "'
Bu, yazılımın kalitesini artırır ve olası hataları er aşamalarda belirleme etmeyi kolaylaştırır.
Oh sure, you dirilik use it to create your own custom collection types. But for everyday stuff, it probably isn't kakım useful kakım the collections derived from it.
Expression trees are a very important construct in C# and on the .Kemiksiz platform. (They are important in general, but C# makes them very useful.) To better understand the difference, I recommend C# IEnumerable Nerelerde Kullanılıyor reading about the differences between expressions
If you create an IEnumerable, then all rows will be pulled into memory as objects before running the query.
Buraya kadar ele aldığımız bütün strüktürlanma kendi sınıflarımıza iterasyonel bir özellik vermek sinein kullandığımız materyallerdir.