c# - Format a string like you would a numeric value -


i have string format same way numeric value. ex:

int num = 2; string option = num.tostring("000"); console.writeline(option); //output //002

but way can think format parse int, apply tostring("000") method it. 

string option = "2"; option = int.parse(option).tostring("000");

is there better, more direct way this?

no, there no built-in mechanism "format" string if number. options:

  • use string functions (pad, length, substring) determine characters should added
  • parse numeric type , use tostring numeric formatting strings
  • use reqular expression extract digits , generate new string

there's not 1 "right" answer. each has risks , benefits in terms of safety (what if string not represent valid integer?), readability, performance, etc.


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