Checking if an object is a number in C#

Question

I\'d like to check if an object is a number so that .ToString() would result in a string containing digits and +,-,.

Answer 1

You could use code like this:

if (n is IConvertible)
  return ((IConvertible) n).ToDouble(CultureInfo.CurrentCulture);
else
  // Cannot be converted.

If your object is an Int32, Single, Double etc. it will perform the conversion. Also, a string implements IConvertible but if the string isn't convertible to a double then a FormatException will be thrown.