c# - Format double type with minimum number of decimal digits

Question

I need to format double type so that it has minimum two decimal digits but without limitation for maximum number of decimal digits:

5     -> "5.00"
5.5   -> "5.50"
5.55  -> "5.55"
5.555 -> "5.555"
5.5555 -> "5.5555"

How can I achieve it?

Answer 1

You can use the 0 format specificer for non-optional digits, and # for optional digits:

n.ToString("0.00###")

This example gives you up to five decimal digits, you can add more # positions as needed.