Is there any way I can specify a standard or custom numeric format string to always output the sign, be it +ve or -ve (although what it should do for zero, I'm not sure!)
6 Answers
Yes, you can. There is conditional formatting. See Conditional formatting in MSDN
eg:
string MyString = number.ToString("+0;-#");
Where each section separated by a semicolon represents positive and negative numbers
or:
string MyString = number.ToString("+#;-#;0");
if you don't want the zero to have a plus sign.
Beware, when using conditional formatting the negative value doesn't automatically get a sign. You need to do
string MyString = number.ToString("+#;-#;0");
For a numeric expression of any type:
+###,###,###,###,###,###,###,###,###,##0.###,###,###,###,###,###,###,###,###,###;-###,###,###,###,###,###,###,###,###,##0.###,###,###,###,###,###,###,###,###,###;0
Use three parts for three cases: positive;negative;zero
Other aspects of the example:
Zero is not signed. You could have it show as anything, such as "zero".
Absolute values less than one have a leading 0 before the decimal point. Adjust to taste.
Number of digits is for the largest and smallest absolute decimal values. Adjust to taste.
Decimal point character is culture-specific. .NET substitutes.
Grouping separators are optional. The character is culture-specific. .NET substitutes. (The positions are also culture-specific but that's only controlled by your format string.) You also use any other character except the special characters for Format (which include , . # 0).
I cannot comment so i Do an answer here (nuts reputation system ....)
You can Use number.ToString("+0;-#") very well to Produce the UTC String TimeFormat
Here showed in PowerShell code
"$([System.DateTime]::Now.ToString('HH:mm:ss.fff'))$($([System.TimeZoneInfo]::Local.GetUtcOffset([System.DateTime]::Now).TotalMinutes.ToString('+0;-#')))"
Thank you @gcores https://stackoverflow.com/users/40256/gcores
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