Question

I have an Asp.net text box that is being auto populated by javascript using Google Maps Api.
The text in the textbox can show any amount of miles from 40.2 – 1,634 mi ect.

I need to take the text from the text box and put it into an int to be stored in the DB.

So really I need a couple things to happen. The text always shows as “40.2 mi” (without the quotes) and what I need is just a round number. or Int. like “40” or “1634”.

So I can store this in my DB table. I’ve tried Substring and Math.Round. But I keep getting exceptions. My most recent attempt is this:

        string miles = txtEstDistance.Text;
        miles.Substring(0, miles.IndexOf('.') > 0 ? miles.IndexOf('.') : miles.Length);

        int oDistanceMiles = Convert.ToInt32(miles);

And the exception I’m getting is:”Input string was not in a correct format.” for this line of code:

int oDistanceMiles = Convert.ToInt32(miles);

I’m lost. .Net 4.0 C#

Answer 1

What if you get rid of the ” mi” first, and treat the rest as a float? Then you can use the Math.Round to round to a whole number and convert that to an int.

If I’m right, the NumberStyles.Float enum will automatically clean up leading or trailing white space. Of course, you can also use string.Trim()

var miles = txtEstDistance.Text;

miles = miles.Substring(0, miles.IndexOf("mi"));

float tmpdistance;
var success = float.TryParse(miles, NumberStyles.Float, CultureInfo.InvariantCulture, out tmpdistance);

if (success)
{
    var distance = Convert.ToInt32(Math.Round(tmpdistance, 0));

    // or

    distance = (int) Math.Round(tmpdistance, 0);
}