Question

How can I convert a range of integers to a list of strings using LINQ?

For example, for a range of integers 1-12, the expected result would be “01”, “02”, “03”, …, “12”.

The approach that I came up with incrementally builds a List<string>. Is there a more succinct way to get my desired result?

var numbers = Enumerable.Range(1, 12);
var numberList = new List<string>();

foreach (var item in numbers)
{
    string mth = (item.ToString().Length == 1)
        ? "0" + item.ToString()
        : item.ToString();

    numberList.Add(mth);
}

Answer 1

ToString can do this for you:

Enumerable.Range(1, 12).Select(n => n.ToString("00"))