Web19 jul. 2011 · Return values should, unless you have a specific use case in mind already, be returning an IEnumerable which is not mutable. If the underlying type is still a List … Web29 okt. 2024 · IEnumerable interface is a generic interface which allows looping over generic or non-generic lists. IEnumerable interface also works with linq query …

Entendendo as diferenças entre IEnumerable e List em C#

WebEDIT: Here is a function that will do as you ask, using yield return, but it has the downside of requiring one GC allocation per iteration: public static IEnumerable> Enumerate (IEnumerable list) { int id = 0; foreach (var elem in list) { yield return new Tuple (id, elem); id++; } } Tags: .Net Ienumerable WebClearly you understand why List can at least be returned as IEnumerable: simply because it implements that interface.. Also clearly, the 3rd example is doing something "extra" that the forth one isn't. As others have said, the 4th fails because of the lack of co-variance (or contra-, I can never remember which way they go!), because you are … how are blister packs made

Difference between IEnumerable and IList and List, IQueryable?

WebBut if the IEnumerable is null, when you try to convert it to a List, you'll get ArgumentNullException saying Value cannot be null. IEnumerable values2 = null; List valueList2 = values2.ToList(); Therefore as mentioned in the other answer, remember to do a null check before converting it to a List. You can do this very simply … WebIEnumerable is simply an interface, List is a class implementing this interface (and a couple more). As for using them: When you accept a list of objects (might be IEnumerable or … Web10 aug. 2010 · IEnumerable basically only supports iterating over the results contained in the collection. IList is more specific, and allows you to: Find out how many items are in … how are blizzards caused