En iyi Tarafı C# IEnumerable Kullanımı

En iyi Tarafı C# IEnumerable Kullanımı

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The difference between IQueryable and IEnumerable is centered around this point. IQueryable builds expression trees whereas IEnumerable does hamiş, at least hamiş in general terms for those of us who don't work in the secret labs of Microsoft.

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

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.

The expression yaşama simply be a constant expression of the object itself or a more complex tree of a composed seki of query operators and operands. The query provider's IQueryProvider.Execute() or IQueryProvider.CreateQuery() methods are called with an Expression

They usually have a GetXXX method that returns a IEnumerable of whatever type the custom collection class uses so the internal collection birey be iterated around using a foreach loop.

Şimdi bu ifadelerin daha kemiksiz olması derunin bir örnek üzerinden gidelim ve bir önceki makaslamakmızda custom Enumerator derslikı ile yazdığımız Alisveris Sepeti iterator örneği kanalırlayalım:

You don't have to open a book and learn how to traverse the tree - but simply use the foreach statement on that object and you're done.)

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

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.

It's for C# IStructuralComparable Temel Özellikleri when you want to be able to use an object with a foreach loop, but you don't C# IStructuralComparable Nasıl kullanılır know exactly what type you're dealing with, whether Array, List, or something custom.

diye sorarsak eğer üst satırlarda bahsettiğimiz kabilinden C# IStructuralComparable nedir o klasın geriye IEnumerator nesnesi dönen GetEnumerator isimli metodu barındırıyor olması demekti. Ee haliyle IEnumerable interface’i müntesip sınıfa uygulandığında GetEnumerator metodunu implement edecektir.

Bu yazgımızın sonra satırlarında IEnumerator interface’ini C# IStructuralComparable Kullanımı detaylandırırken, kendi enumeratorümüzü oluşturmayıda süjeşacağız. Fakat şimdilik bu örneğimizde koleksiyon yahut dizi binalarının GetEnumerator metodunu kullanmamız fiilimizi yeterince görmektedir.

If you are writing a class, and your class implements the IEnumerable interface (generic (T) or not) you're allowing any consumer of your class to iterate over its collection without knowing how it's structured.