@OlivierJacot-Descombes: Short of using Reflection, there's no way of knowing whether an IList which allows anything of a given type to be stored by index will allow everything of that type to be stored by index.
So when you have to simply iterate through the in-memory collection, use IEnumerable, if you need to do any manipulation with the collection like Dataset and other veri sources, use IQueryable
Birli per other answers, the evaluation of the result was deferred until calling ToList or similar invocation methods for example ToArray.
Consider that in your code example a new list created. I don't know what is m_states, but if this is a value types collection, you create a clone of the original list. In this way the returning list yaşama be manipulated form the caller Add/Remove/Update elements. without
An Enumerable is a class that yaşama give you Enumerators. It saf a method called GetEnumerator which gives you an Enumerator that looks at its items. When you write a foreach loop in C#, the code that it generates calls GetEnumerator to create the Enumerator used by the loop.
Oluşturduğunuz derslikı, koleksiyon oluştururken yahut zıtlaştırma gerektiren başka senaryolarda kullanabilirsiniz.
So the difference between IQueryable and IEnumerable is about where the filter logic is executed. One executes on the client side and the other executes on the database.
It is a best practice to C# IEnumerable Nedir implement IEnumerable and IEnumerator on your collection classes to enable the foreach (For Each in Visual Basic) syntax, however implementing IEnumerable is derece required. If your collection does derece implement IEnumerable, you must still follow the iterator pattern to support this syntax by providing a GetEnumerator C# IEnumerable Nerelerde Kullanılıyor method that returns an interface, class or struct.
Bu şekilde derme karınindeki elemanlara sırasıyla ulaşım sağlamlanabilir. Horda bu kullanmaı gösteren bir örnek bulunmaktadır:
Is it legal to initialize an array via a functor which takes the array itself bey C# IEnumerable Kullanımı a parameter by reference? more hot questions
IEnumerable ve IQueryable aradındaki üstelikı anlatmadan önce kısaca bu iki C# IEnumerable Nasıl Kullanılır interface klasını tanıyalım.
Evet hoca, onca yazdın çizdin anladıkta dü satır IEnumerable yahut IEnumerator interfacelerini kullanmadın?
IQueryable C# IEnumerable Nerelerde Kullanılıyor is faster than IEnumerable if we are dealing with huge amounts of data from database because,IQueryable gets only required data from database where birli IEnumerable gets all the data regardless of the necessity from the database
Below mentioned small test might help you understand one aspect of difference between IQueryable and IEnumerable. I've reproduced this answer from this post where I was trying to add corrections to someone else's post