find if an integer exists in a list of integers

Question

i have this code:

  List apps = getApps();

        List ids;

        List dropdown = apps.ConvertAll(c => new          


        

Answer 1

As long as your list is initialized with values and that value actually exists in the list, then Contains should return true.

I tried the following:

var list = new List<int> {1,2,3,4,5};
var intVar = 4;
var exists = list.Contains(intVar);

And exists is indeed set to true.

Answer 2

If you just need a true/false result

bool isInList = intList.IndexOf(intVariable) != -1;

if the intVariable does not exist in the List it will return -1