Question

I have a string “246246.246” that I’d like to pass to the IConvertable interface, ToInt16, ToInt32, ToIn64. What is the best way to parse a string with decimal places to an integer?

This is a solution, but is there a better solution?

string value = "34690.42724";
Convert.ToInt64(Convert.ToDouble(value));

Answer 1

To do this discounting rounding you could do:

Convert.ToInt64(Math.Floor(Convert.ToDouble(value)));

If you need to round you could replace Math.Floor with Math.Round.

Edit: Since you mentioned in a comment that you’ll be rounding:

Convert.ToInt64(Math.Round(Convert.ToDouble(value)));

If you have to worry about localization/globalization then as @xls said you should apply a CultureInfo in the conversions.

Edit 2: Alternative method using a string function (not terribly elegant IMO – maybe it could be elegantized with a predicate function):

Convert.ToInt64(value.Substring(0, value.IndexOf('.') > 0 ? value.IndexOf('.') : value.Length));