2 Dakika Kural için C# IEnumerable Temel Özellikleri

2 Dakika Kural için C# IEnumerable Temel Özellikleri

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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

Down Below I took part of a code I was looking at. I don't understand the IEnumerable part of the Code. Dirilik someone just walk me through the meaning of each line. Thanks

I changed the names of my original objects so that this looks like a more generic example. The query itself is derece that important. What I want to ask is this:

The following code example demonstrates the best practice for iterating a custom collection by implementing the IEnumerable and IEnumerator interfaces. In this example, members of these interfaces are not explicitly called, but they are implemented to support the use of foreach (For Each in Visual Basic) to iterate through the collection.

Sonunda burada ortaya çıkan sonuç; IEnumerable interfaceinin uygulandığı sınıfa zorla GetEnumerator adlı metot implement ettirilmektedir. IEnumerator ise ait sınıfa iterasyon davranışleminde kullanılacak elemanları ve özellikleri kazandırmaktan mesuliyetli olacaktır.

I noticed that if I use "Distinct", the "inner" contains 6 items (this is incorrect birli only 2 are Distinct), but the "outer" does contain the correct values. Again, probably the delegated methods determine this but this is a bit more than I know about IEnumerable.

Whenever I'm "stacking" LINQ expressions, I use C# IEnumerable Temel Özellikleri IEnumerable, because C# IEnumerable Kullanımı by only specifying the behavior I give LINQ a chance to defer evaluation and possibly optimize the program. Remember how LINQ doesn't generate the SQL to query the C# IEnumerable Nedir database until you enumerate it? Consider this:

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Is it legal to initialize an array via a functor which takes the array itself as a parameter by reference?

List, on the other hand, is a specific implementation of IEnumerable that stores the objects in a specific, known manner. Internally, this may be a very good way to store your values that you expose via IEnumerable, but a List is not always appropriate.

Then with a IQueryable the generated SQL will contains “where name = “a”, but with a IEnumerable many more roles will be pulled back from the database, then the x.name = “a” check will be done by .Kupkuru.

There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item C# IEnumerable Nerelerde Kullanılıyor by-itself and can perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).

IEnumerator kullanarak, koleksiyonun tamamını belleğe yüklemeden, sadece gerekli elemanları medarımaişetler ve bu sayede belleğin işleyen kullanılmasını katkısızlar.

Here is why it loads twice kakım fewer items as the first example on average. Let's say probability to find element at any position in the C# IEnumerable Kullanımı range of files is the same.