.net - Format Numeric Strings -

i want format integer appears 1000's separator (,)

my attempts far have been:

string.format("{0:#,###.##}", 1234.0);            // 1,234 string.format("{0:#,###.##}", 1234.05);            // 1,234.05 string.format("{0:#,###.##}", 1234);            // 1,234 

i struggling display values output 1,234.0.. please suggest me how output string 1,234.0 ??

the way understand question:

• you want thousand separator every 3 digits on integer side
• you want 1 digit on fractional side

additionally, guess that

• you want @ least 1 digit on integer side

the problem format strings you're using you're using # specify digit positions. according documentation, character means:

replaces "#" symbol corresponding digit if 1 present; otherwise, no digit appears in result string.

(my emphasis)

on other hand, 0 character:

replaces 0 corresponding digit if 1 present; otherwise, 0 appears in result string.

(again, emphasis)

so should use 0's instead of #'s.

specifically, here format string use according 3 bulletpoints @ top of answer:

#,##0.0 

this means:

• comma means "add thousand separator"
• the #,##0 means "set aside place integer part here, add thousand separator if necessary, , add digits after first if necessary, add @ least 1 digit, don't .1 result"
• .0 means "1 fractional digit"
  • your .# mean "add decimal point , fractional digit if fractional digit other 0, if 0, don't add either", that's main problem formatting strings

here's .net fiddle try with.