C# IEnumerable Kullanımı - Genel Bakış

C# IEnumerable Kullanımı - Genel Bakış

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This isn't without cost, bey it means you need either a new connection to do another DB request in parallel or a Merih connection. Too much for a comment really

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.

This where filter is executed on the client side where the IEnumerable code is. In other words all the data is fetched from the database and then at the client its scans and gets the record with EmpId is 2.

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 çıhun sonuç; IEnumerable interfaceinin uygulandığı sınıfa zorla GetEnumerator adlı metot implement ettirilmektedir. IEnumerator ise alakadar sınıfa iterasyon meseleleminde kullanılacak elemanları ve özellikleri kazandırmaktan mesul olacaktır.

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

Ryan LundyRyan Lundy 208k4141 gold badges183183 silver badges214214 bronze badges 3 4 Then why do we need this IEnumerable abstraction, if the only thing it does is just provide an access to Enumerator? Why don't just use Enumerator instead

What US checks and balances prevent the FBI from raiding politicians unfavorable to the federal government?

Else use an IEnumerable. The default should be to use the on-demand evaluation in the second example, bey that generally uses less memory, unless there is a specific reason to store the results in a list.

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 C# IStructuralComparable Kullanımı to store your values that you expose via IEnumerable, but a List is derece always appropriate.

Does it bring the whole collection in memory? Or, does it instantiate the element one by one, kakım it iterates over the foreach loop? thanks

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

Bu hatmızın sonra satırlarında IEnumerator interface’ini detaylandırırken, kendi enumeratorümüzü oluşturmayıda sayfaşacağız. Amma şimdilik bu C# IStructuralComparable nerelerde kullanılıyor örneğimizde derme yahut sekans konstrüksiyonlarının GetEnumerator metodunu kullanmamız işlemimizi yeterince görmektedir.

The most important thing to realize is that, using Linq, the query does not get evaluated immediately. It is only run bey part of iterating through the resulting IEnumerable in a foreach - that's C# IStructuralComparable nerelerde kullanılıyor what all the weird delegates are doing.