Int32.TryParse with multiple group separators

Question

I'm trying to create a method that can handle and validate integers as on ok input. The issue is our requirements which states the following numbers as an ok input regardless of chosen language:

1500, 1.500, 1,500, 1 500
-1500, -1.500, -1,500, -1 500
1500000, 1.500.500, 1,500,500 1 500 500
-1500000, -1.500.500, -1,500,500 -1 500 500

and so on.

My method now looks like this:

private bool TryParseInteger(string controlValue, out int controlInt)
{
      int number;
      NumberStyles styles = NumberStyles.Integer | NumberStyles.AllowThousands;

      bool result = Int32.TryParse(controlValue, styles,
            CultureInfo.InvariantCulture, out number);
      controlInt = number;

      return result;
}

This does not work as I want it to. 1.500 and 1.500.500 is not validated as a correct input.

Is there another way to approach this?

Thanks for all the help. As it turns out 1.500,50 (and so on) should not pass validation which makes the suggested solutions not work. Any other ideas?

Answer 1

Just replace all those signs!

This code:

string[] arr = new[] { "1500", "1.500", "1,500", "1 500", "-1500", "-1.500", "-1,500", "-1 500",
                                "1500000", "1.500.500", "1,500,500","1 500 500",
                                "-1500000", "-1.500.500", "-1,500,500","-1 500 500"};

foreach (var s in arr)
{
    int i = int.Parse(s.Replace(" ", "").Replace(",", "").Replace(".", ""));

    Console.WriteLine(i);
}

Produces:

1500

1500

1500

1500

-1500

-1500

-1500

-1500

1500000

1500500

1500500

1500500

-1500000

-1500500

-1500500

-1500500