7+ Enumerable.Empty Vs New List
In NET Framework ArrayEmpty and EnumerableEmpty each have their own separate caches but I recently changed EnumerableEmpty in. I think most postings missed the main point.
It can help when you want to return no values.

. The EnumerableEmpty version is slowest kind of expected. When the object it returns is enumerated it yields no elements. The Empty method caches an empty sequence of type TResult.
If a method has a IEnumerable as return value then we should report an issue if the method returns a new List or similar. But surprisingly it does not allocate. The Empty method caches an empty sequence of type TResult.
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The benefit is to avoid unnecessary. As a static generic method you must specify the type of the sequence you want to generate. In some cases this method is useful for passing.
The main difference between IEnumerable and List in C is that IEnumerable is an interface while List is a concrete class. If you iterate it twice those objects will not be the same each time. IEnumerable vs List.
That line produces an enumerable of 10 objects. But if all you are doing is building up this collection we can. IEnumerable x EnumerableRange0 10Selectnew object.
ArrayEmpty returns T an array whereas. Thus EnumerableEmpty int will. The reason is the implementation behind it is EmptyPartition.
In a method if we want a temp collection a common pattern is to create a list and return the list since a list is an IEnumerable. Even if you use an empty array or empty list those are objects and they are stored in memory. The following code examples demonstrate how to use DefaultIfEmpty IEnumerable to provide a default value in case the source sequence is empty.
The primary difference is the return type.
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