Question

I am reading in a pipe delimited file and need to check whether a column is a valid currency (i.e. it must follow a format as xxxxx.xx , so a maximum of two digits after the decimal although it is not necessary to have any digits after the decimal). How would I go about doing this in C#?

Answer 1

Try converting your value to a currency, like this:

double dummy;
bool valid = double.TryParse(value, NumberStyles.Currency, CultureInfo.GetCultureInfo("en-US"), out dummy);

valid will then be either true if TryParse could parse it as a currency. This is by far a better option than using regular expressions.

To get the fraction (decimals) of your value, just convert it to an int and subtract it from the original value, like:

double fraction = value - (int)value;

fraction will then contain decimals and you can do whatever you like with them.