How can I fix error "Index was out of range must be nonnegative and less than the size of the collection"? in C#

Question

How to fix error "Index was out of range must be nonnegative and less than the size of the collection"?

    // Create new List called _identifiers
    private List<string> _identifiers = new List<string>();

    // Add identifiers to the Identifiable object
    public IdentifiableObject (string[] idents)
    {
        for(int i=0; i<idents.Length; i++)
        {
            idents [i] = _identifiers [i];
        }
    }

`_identifiers` is empty, so attemtping to access `_identifiers[0]` will pop the error — Khalil Khalaf, Aug 11 '16 at 13:03
I recommend scrolling down the page a bit and following some of the links under the "Related" heading in the sidebar. — adv12, Aug 11 '16 at 13:03
We need some context. At first glance, your list `_identifiers` is empty, so even `_identifieres[0]` throws this exception because _there is no 0th element in your list_ — René Vogt, Aug 11 '16 at 13:03
http://stackoverflow.com/questions/24812679/what-is-an-index-out-of-range-exception-and-how-do-i-fix-it — Dah Sra, Aug 11 '16 at 13:03
I have the feeling that you want instead __identifiers.Add/(idents[i]);_ — Steve, Aug 11 '16 at 13:05

score 0 · Answer 1 · answered Aug 11 '16 at 13:04

Looks like the length of your _identifiers-array is less than the length of your idents-array. Thus, while you're looping through all identifiers until the max length of idents, you try to access an inexistent inxed of _identifiers.

In your case, _identifiers is empty, so it's clearly less long than your idents

How can I fix error "Index was out of range must be nonnegative and less than the size of the collection"? in C#

1 Answers1