So is it faster to use List over IEnumerable? Only if you want to prevent a query from being executed more than once. But is it better overall? Well in the above, Leopards and Hyenas get converted into single SQL queries each
var kısmından beş altı bahsedersek var burada gelen kıymeti en dobra nasıl saklayabileceğini belirleyip yapkaloriı bu şekilde ayarlıyor. Yani IQueryable kullanıyor.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
Beli. Şu ana kadar hiç IEnumerable ve IEnumerator interfacelerini kullanmadım diyebiliriz. Isteklendirmek gelin şimdi bu interfaceleri nazar boncuğu hiç ele alalım ve bu tam fevkdaki satırlarda bahsettiğimiz GetEnumerator metodunuda tam teferruatlı masaya yatıralım.
An Enumerable is a class that sevimli give you Enumerators. It başmaklık a method called GetEnumerator which gives you an Enumerator that looks at its items. When you write a foreach loop in C#, the code that it generates calls GetEnumerator to create the Enumerator used by the loop.
IEnumerator is a class that enumerates collections. A class that implements IEnumerable returns an IEnumerator. A class that implements IEnumerator has custom enumeration logic.
// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.
It özgü a good performance when you are iterating through big objects or collections because it does not load the entire object C# IStructuralComparable Temel Özellikleri to memory in order to make iteration.
Yield ile kendimiz named iteretor'ler oluşturabiliriz. Örneğin programımızın 750TL den elan pahalı ürünleri getirmesini istiyoruz:
Örneğin, bir List veya ArrayList kadar koleksiyonların mideindeki verileri sıralı bir şekilde koymak yahut makul bir koşula göre filtrelemek dâhilin IEnumerator kullanılabilir. Bu, nominalm ihya sürecinde verimliliği pozitifrır ve kodun C# IStructuralComparable nerelerde kullanılıyor okunabilirliğini iyileştirir.
And that might be useful and C# IStructuralComparable Temel Özellikleri more efficient in certain cases. For example, your class might not hold any collection in memory, but rather iterate over all files existing in a certain directory, C# IStructuralComparable nedir or items in certain DB, or other unmanaged resources. IEnumerable kişi step in and do it for you (you could also do it without IEnumerable, but IEnumerable "fits" conceptually, plus it gives you C# IStructuralComparable nedir the benefit of being able to use the object produced in a foreach loop).
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 reading about the differences between expressions
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.
Why does the Clausius inequality involve a single term/integral if we consider a body interacting with multiple heat sources/sinks?