Getting the count of an IEnumerable list?

Question

In my code, I am attempting to output the amount of items in my movie list from a console command, but I'm not entirely sure on how I'd be able to grab the amount of items from the list. The list is originally created as a private list, but I have a property making it an IEnumerable list, shown below.

public IEnumerable<Movie> Movies
        {
            get
            {
                return this.movies;
            }
        }

How would I be able to count how many items are within the list that is given by the property?

Possible duplicate of [Howto: Count the items from a IEnumerable without iterating?](http://stackoverflow.com/questions/168901/howto-count-the-items-from-a-ienumerablet-without-iterating) — Simon Bosley, Mar 23 '17 at 16:27
Possible duplicate of [IEnumerable doesn't have a Count method](http://stackoverflow.com/questions/2659290/ienumerable-doesnt-have-a-count-method) — Renats Stozkovs, Mar 23 '17 at 16:38

score 4 · Answer 1 · answered Mar 23 '17 at 16:25

4

What is the problem with calling the Count method:

Movies.Count();

You will need System.Linq namespace.

answered Mar 23 '17 at 16:25

Sadique

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I didn't have that namespace so I couldn't see the option. Thanks dude! – Dakota Worzella Mar 23 '17 at 16:27

score 0 · Answer 2 · answered Mar 23 '17 at 16:29

If your collection actually is a list you can cast it back instead of using the Count()-method, that IEnumerable provides. Not sure if List.Count() will internally call List.Count - but I expect it to. Anyway here´s the code for the cast:

public IEnumerable<Movie> Movies
{
    get
    {
        return this.movies;
    }
}

var theList = instance.Movies as IList<Movie>();
if (theList != null) 
    count = theList.Count;
else 
    count = instance.Movies.Count();

Getting the count of an IEnumerable list?

2 Answers2