Is this extension method to force a string into an integer or default to 0 redundant?

Question

I needed a one-liner to convert a string to an integer, and if the string is anything invalid, then just set it to zero. So I made the following extension method, but I can imagine there is a system method to do this in one line.

Is there another way to do this in one line without creating an extension method?

using System;

namespace TestForceInteger
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("testing".ForceInteger() + 1);
            Console.WriteLine("199".ForceInteger() + 1);
            int test = StringHelpers.ForceInteger(null);
            Console.WriteLine(test + 1);
            Console.ReadLine();
            //output:
            //1
            //200
            //1
        }
    }

    public static class StringHelpers
    {
        public static int ForceInteger(this string potentialInteger)
        {
            int result;
            if (int.TryParse(potentialInteger, out result))
                return result;
            else
                return 0;
        }
    }
}

Answer 1

Not as a one-liner, afaik, but if you want to avoid the extension method you can initialize the result to 0 and ignore the outcome of TryParse:

int result = 0;
int.TryParse(potentialInteger, out result)

Answer 2

Not a conventional way with the framework libraries, no.

Your extension method would be better if it returned a nullable int, so that you could distinguish between "invalid" and 0.