Numerical formatting using String.Format

Question

Are there any codes that allow for numerical formatting of data when using string.format?

Answer 1

Yes, you can specify the formatting after a : in the {} placeholder.

specifier	type	format	output (double 1234.56)
0	zero placeholder	{0:00.000}	1234.560
#	digit placeholder	{0:#.##}	1234.56
.	decimal point placeholder	{0:0.0}	1234.6
,	thousand separator	{0:0,0}	1,235
%	percentage	{0:0%}	123456%

In addition there is the group separator ; this is useful for varying the format, depending on the value of the parameter passed. For example:

string.Format("{0:£#,##0.00;(£#,##0.00);Nothing}", value);

This will output "£1,240.00" if passed 1243.56. It will output the same format bracketed if the value is negative "(£1,240.00)", and will output the string "Nothing" if the number is zero.