Call method x times using linq

Question

I would like to call one method 3 times Using LINQ, the method returns an object, with that object I want to add it into a List, How do i do it?

List<News> lstNews = new List<News>();

lstNews.Add(CollectNews) [x 3 times] <-- Using Linq 

private static News CollectNews(){
...
}

Answer 1

var lstNews = Enumerable.Repeat(0, 3).Select(_ => CollectNews()).ToList();

Answer 2

You can System.Linq.Enumerable to repeat an Action multiple times.

                Enumerable.Repeat<Action>(() =>
            {
                lstNews.Add(CollectNews);
            }, 3);

This would run the Add method on the list 3 times. Docs on Enumerable.Repeat here.

Answer 3

As I understand you want to end up with a list of three News objects. You can do something like

Enumerable.Repeat(1, 3).Select(_ => CollectNews()).ToList();

You could use any value in place of 1 in that example.

While this approach works, it's sort of abusing the idea of LINQ. In particular, you should not assume any order of executing CollectNews() calls. While the standard Select implementation will execute in sequence this may not always be true.