显示带有千位分隔符的整数

Question

i want to display a integer value with a thousand seperator. i found following ways:

int i = 0101010101;
Console.WriteLine(i.ToString("N0")); // 101.010.101
Console.WriteLine(i.ToString("#,#"));// 101.010.101

what's the difference / advantage of each?

Answer 1

There is at least one difference. If you test it with i = 0 , then the "N0" format string outputs 0 , and the "#,#" format string outputs nothing at all. As the documentation states:

Note that this specifier never displays a zero that is not a significant digit, even if zero is the only digit in the string. It will display zero only if it is a significant digit in the number that is being displayed.