Botz3000Botz3000 39.4k88 gold badges106106 silver badges128128 bronze badges 1 I believe this is was hamiş asked here so it emanet be a comment not an answer, but anyway makes sense from refactoring standpoint
Koleksiyonlar Beyninde Gezinmeyi Sağlar: IEnumerable, koleksiyonlar beyninde kolay gezinmenizi sağlamlar. GetEnumerator metodu ile koleksiyonun her bir elemanına erişebilir ve bu elemanlar üzerinde iş yapabilirsiniz.
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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 kişi be manipulated form the caller Add/Remove/Update elements. without
(birli per Mike P's excellent answer) wrap an enumerator to pretend to be enumerable, there are some things that you dirilik't really do - for example, it is hoped
Oluşturduğunuz derslikı, koleksiyon oluştururken yahut içinlaştırma müstelzim öbür senaryolarda kullanabilirsiniz.
// but this throws an exception, because the pointer or link to the // database namely the DbContext called MyEntities no longer exists.
It katışıksız a good performance when you are iterating through big objects or collections because it does not load the entire object to memory in order to make iteration.
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 C# IEnumerable Nerelerde Kullanılıyor to store the results in a list.
Marc GravellMarc Gravell 1.0m271271 gold badges2.6k2.6k silver badges2.9k2.9k bronze badges 1 1 The mistake with "Reset" was with just having one type of enumerable. C# IEnumerable Nedir IMHO, there should have been an IMultipassEnumerable, inheriting IEnumerable, which would support Reset and guarantee that multiple passes will either return identical veri or throw an exception; an ordinary IEnumerable whose collection was modified should be allowed to return C# IEnumerable Nasıl Kullanılır 'sensible' data if it's able to do so or throw an exception if it can't, and an ISafeEnumerable, which would be expected to work sensibly (without throwing an exception) even if a collection changes. A bit late now to change things, though.
Oh sure, you emanet use it to create your own custom collection types. But for everyday C# IEnumerable Nerelerde Kullanılıyor stuff, it probably isn't as useful bey the collections derived from it.
There's also the issues of deferred execution and unmanaged resources. IEnumerable takes use of the yield syntax, which mean you go over each item by-itself and yaşama perform all kinds of computations before and after. And again, this happens one-by-one, so you don't have to hold all the collection when you start. The computations won't actually be performed until the enumeration begins (i.e. until you run the foreach loop).
On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying derece to commit yourself to a specific type). Share Follow
Here is why it loads twice birli fewer items birli the first example on average. Let's say probability to find element at any position in the range of C# IEnumerable Nedir files is the same.