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If you tasavvur to build a public API, it's better to use IEnumerable than List, because you better use the most minimalistic interface/class. List lets you access objects by index if that's required.
The second example returns an IEnumerable that contains all the information needed to run the query later on.
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Said in a very simple way, that any object implementing this interface will provide a way to get an enumerator. An enumerator is used with the foreach birli one example.
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It has a good performance when you are iterating through big objects or collections because it does hamiş load the entire object to memory in order to make iteration.
IEnumerable describes behavior, while List is an implementation of that behavior. When you use IEnumerable, you give the compiler a chance to defer work until later, possibly optimizing along the way. If you use ToList() you force the compiler to reify the results right away.
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. 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 'sensible' veri if it's able to do so or throw an exception if it birey't, and an C# IEnumerable Nedir 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.
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
Generally, don't worry about what's actually C# IEnumerable Nedir in the IEnumerables, kakım it will be completely different from your actual code. Only worry about the actual output when you iterate over it :)
On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying hamiş C# IEnumerable Nerelerde Kullanılıyor to commit yourself to a specific type). Share Follow
When declaring a method’s parameter types, you should specify the weakest type possible, preferring interfaces over base classes. C# IEnumerable Kullanımı For example, if you are writing a method that manipulates a collection of items, it would be best to declare the method’s parameter by using an interface such C# IEnumerable Nasıl Kullanılır bey IEnumerable rather than using a strong data type such birli List or even a stronger interface type such bey ICollection or IList: