5 Basit Teknikleri için 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 data than is actually needed, and we waste cycles doing the filtering in the client.

Örneğin oluşturduğumuz bir List içine biz Add komutu ile ekleme yapabiliyoruz veya Count ile içerisinde kâin elemanların saykaloriı alabiliyoruz ve bunu foreach içerisinde kullanabiliyoruz. Evet List bir sınıf olmasına rağmen foreach nasıl buna cevaz veriyor?

The second method allows only List objects to be passed in; it will not accept an array or a String object. Obviously, the first method is better because it is much more flexible and can be used in a much wider range of scenarios.

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.

This will create a new list element for each element in memory, enumerating the IEnumerable and is thus less performant if you only enumerate once - but safer and sometimes the List methods are handy (for instance in random access).

So if you working with only in-memory veri collection IEnumerable is a good choice but if you want to query data collection which is connected with database `IQueryable is a better choice kakım it reduces C# IEnumerable Temel Özellikleri network traffic and uses the power of SQL language.

Şimdi bu ifadelerin henüz kategorik olması midein bir örnek üzerinden gidelim ve bir önceki makaslamakmızda custom Enumerator derslikı ile yazdığımız Alisveris Sepeti iterator örneği hatırlayalım:

The constructor is not responsible for returning data to the caller. 2-We need to call a method that returns the cars array. That is in a real-world case, a method that returns an array should be coded in Garage and it should return an array, in which case, there would be no need to use IEnumerable.

Nobody C# IEnumerable Temel Özellikleri mentioned one crucial difference, ironically answered on a question closed as a duplicated of this. IEnumerable is read-only and List is not.

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

IEnumerable ve IQueryable aradındaki üstelikı anlatmadan önce kısaca bu iki interface sınıfını teşhisyalım.

Expression trees are a very important construct in C# and on the .NET 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

C# dilinde, IEnumerator özellikle dundaki kadar koleksiyonlar üzerinde done kıraat ve işçiliklemlerinde yeğleme edilir:

şayet ki siz “var” harcamak istiyorsanız GetEnumerator metodunun art dönüş tipini zirdaki üzere generic IEnumerator olarak teşhismlamanız gerekmektedir.