C# IEnumerable Temel Özellikleri Üzerinde Bu Rapor inceleyin

C# IEnumerable Temel Özellikleri Üzerinde Bu Rapor inceleyin

Blog Article

Eğer milyonlarca eşya üzerinde sorgulama mesleklemi örgüyorsak elbette IQueryable IEnumerable göre henüz hızlı sorgulama medarımaişetlemi yapar.

Umarım bu konu hakkında kafanızda bir fikir oluşturabilmişimdir.Bu yazı bâtınin oluşturduğum projenin kodlarını GitHub hesabımdaki “MyArticlesCodes” repository’sinde bulabilirsiniz.

So unless you want to perform operations that are more efficient on the list, this really does mean lower performance.

Analogy: Imagine you are a detective on an aeroplane . You need to work your way through all the passengers to find your suspect.

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.

The syntax (which you rarely see because there are prettier ways to do it) for moving through a collection that implements IEnumerable is:

The primary difference is that the LINQ operators for IQueryable take Expression objects instead of delegates, meaning the custom query logic it receives, e.g., a predicate or value selector, is in the form of an expression tree instead of a delegate to a method.

It is a best practice to implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however implementing IEnumerable is hamiş required. If your collection C# IEnumerable Nerelerde Kullanılıyor does hamiş implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator method that returns an interface, class or struct.

Now what makes IEnumerable really stand out is iterator blocks (the yield keyword in C#). Iterator blocks implement the IEnumerable interface like a List or an Array, but they're very special because unlike a List or Array, they often only hold the state for a single item at a time. So if you want to loop over the lines in a very large file, for example, you can write an iterator block to handle the file input.

There are many cases (such kakım an infinite list or a very large list) where IEnumerable cannot be transformed to a List. The most obvious examples are all the prime numbers, all the users of feysbuk with their details, or all the items on ebay. The difference is that "List" objects are stored "right here and right now", C# IEnumerable Kullanımı whereas "IEnumerable" objects work "just one at a time".

Here is a very good article that details the differences between statement lambdas and expression lambdas and discusses the concepts of expression tress in greater depth: Revisiting C# delegates, expression trees, and lambda statements vs. lambda expressions.."

Ya sarıklı, onca yazdın çizdin anladıkta iki satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?

IEnumerable is an interface that defines one method GetEnumerator which returns an IEnumerator interface, C# IEnumerable Nasıl Kullanılır this in turn allows readonly access to a collection. A collection that implements IEnumerable can be used with a foreach statement.

When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. For example, C# IEnumerable Nerelerde Kullanılıyor if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using an interface such bey IEnumerable rather than C# IEnumerable Nedir using a strong veri type such bey List or even a stronger interface type such bey ICollection or IList: