Combining C# String.Format format options

Question

I'd like to format my number as a percent value with an always visible sign.

To format it as a percent value I can do:

string.Format("{0:P2}", 1.45);

For visible signs I'll do:

string.Format("{0:+#.##;-#.##;0}", 1.45);

Any way to combine the two?

Please prefer string interpolation over string.Format. The readability improvements are dramatic. — Aluan Haddad, Commented May 17, 2017 at 13:40
Well, upgrade! You can downlevel many language features to older runtimes besides. Here is a helpful reference on format specifiers: msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx P.S: Google is my friend and yours too :) — Aluan Haddad, Commented May 17, 2017 at 13:42
I would argue the easiest option is something like this (1.45 < 0 ? "-" : "+") + String.Format("{0:P2}", 1.45);, provided your .NET version predicament — Alfie Goodacre, Commented May 17, 2017 at 13:43
I would upgrade if i could :))) Can you refrain from posting if you're not helping with the original question? — user1255410, Commented May 17, 2017 at 13:44

Sinatr · Accepted Answer · 2017-05-17 13:45:56Z

4

You probably just want to add % to custom format:

string.Format("{0:+#.##%;-#.##%;0}", 1.45); // output +145%

answered May 17, 2017 at 13:45

Sinatr

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No need to repeat the # twice after the . . Why you don't just use it like this string.Format("{0:+#.#%;-#.#%;0}", 1.45);
– Hossein Narimani Rad
Commented May 17, 2017 at 13:55
@HosseinNarimaniRad, tbh I was simply copy-pasting OP input. But what you suggest is not the same #.# and #.## results are different, try yourself with 1.45678.
– Sinatr
Commented May 17, 2017 at 13:58

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