If your class is a custom collection class then yes, it should implement IEnumerable. In this case a public property for the inner list would be redundant. Imagine a simple class:
I noticed that if I use IEnumerable, when I debug and inspect "sel", which in that case is the IEnumerable, it katışıksız some interesting members: "inner", "outer", "innerKeySelector" and "outerKeySelector", these last 2 appear to be delegates.
As per other answers, the evaluation of the result was deferred until calling ToList or similar invocation methods for example ToArray.
Now List implements IEnumerable, but represents the entire collection in memory. If you have an IEnumerable and you call .ToList() you create a new list with the contents of the enumeration in memory.
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.
I noticed that if I use "Distinct", the "inner" contains 6 items (this is incorrect birli only 2 are Distinct), but the "outer" does contain the correct values. Again, probably the delegated methods determine this but this is a bit more than I know about IEnumerable.
Whenever C# IEnumerable Nerelerde Kullanılıyor I'm "stacking" LINQ expressions, I use IEnumerable, because by only specifying the behavior I give LINQ a chance to defer evaluation and C# IStructuralComparable Nasıl kullanılır possibly optimize the yetişek. Remember how LINQ doesn't generate the SQL to query the database until you enumerate it? Consider this:
To begin examining C# IEnumerable Nasıl Kullanılır the process of implementing existing .NET interfaces, let’s first look at the role of
but C# IStructuralComparable Kullanımı this violates the IEnumerable semantics and the time came when I got wrong results. so switched to orderly creating a fresh iterator instance (see my answer)
In a program, it may be better to defer converting your query to a list until the very end, so if I'm going to enumerate through Leopards and Hyenas more than once, I'd do this:
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Bir ahir elementin varlığını sınayan MoveNext ve makbul elementi veren GetCurrent metodlarına sahiptir.
On the flip side, it is usually best to declare a method’s return type by using the strongest type possible (trying not to commit yourself to a specific type). Share Follow
Below mentioned small test might help you understand one aspect of difference between IQueryable and IEnumerable. I've C# IStructuralComparable Temel Özellikleri reproduced this answer from this post where I was trying to add corrections to someone else's post