En iyi Tarafı C# IEnumerable Nerelerde Kullanılıyor

En iyi Tarafı C# IEnumerable Nerelerde Kullanılıyor

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, and the database only returns the rows that are relevant. But if we had returned a List from AllSpotted(), then it may run slower because the database could return far more veri than is actually needed, and we waste cycles doing the filtering in the client.

Anything in .NET that you sevimli iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements IEnumerable, you kişi make your class usable in foreach statements by implementing IEnumerable (and by creating an enumerator class that its new GetEnumerator method will return).

Genel sıfır bir koleksiyon üzerinde macerasız bir yinelemeyi destekleyen bir numaralandırıcıyı kullanıma sunar.

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

(birli per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you hayat't really do - for example, it is hoped

Bu işlemleri tamamladıktan sonra foreach içerisinde şirket sınıfını kullanmayı denersek sakatlık vermeyecektir.

So if I am going through all the items on ebay, one at a time would be something even a small computer dirilik handle, but ".ToList()" would surely run me out of memory, no matter how big my computer was. No computer sevimli by itself contain and handle such a huge C# IEnumerable Temel Özellikleri amount of data.

the IEnumerable interface, so anything you güç do with a "plain" IEnumerable, you sevimli also do with an IQueryable. IEnumerable just özgü a GetEnumerator() method that returns an Enumerator for which you hayat call its MoveNext() method to iterate through a sequence of T

Now what makes IEnumerable really stand out is iterator C# IEnumerable Nerelerde Kullanılıyor 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 C# IEnumerable Temel Özellikleri a single item at a time. So if you want to loop over the lines in a very large C# IEnumerable Nedir file, for example, you hayat write an iterator block to handle the file input.

In a program, it may be better to defer converting your query to a list until the very end, so if I'm going C# IEnumerable Kullanımı to enumerate through Leopards and Hyenas more than once, I'd do this:

IEnumerable is refering to a collection but IQueryable is just a query and it will be generated inside a Expression Tree.we will run this query to get data from database. Share Follow

But if your class cannot act like a collection then provide a public IEnumerable property for its elements:

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

Eğer ki siz “var” işletmek istiyorsanız GetEnumerator metodunun mazi dilküş tipini hordaki gibi generic IEnumerator olarak teşhismlamanız gerekmektedir.