C# 6 how to format double using interpolated string?

Question

I have used interpolated strings for messages containing string variables like $"{EmployeeName}, {Department}". Now I want to use an interpolated string for showing a formatted double.

Example

var aNumberAsString = aDoubleValue.ToString("0.####");

How can I write it as an interpolated string? Something like $"{aDoubleValue} ...."

Note: string interpolation uses current culture. For insensitive interpolation, you can use Invariant from System.FormattableString: Invariant($"at {num}"). See stackoverflow.com/questions/33203261/… — ANeves
– ANeves, Commented Nov 21, 2018 at 19:52

lc. · Accepted Answer · 2016-05-09 10:41:03Z

190

You can specify a format string after an expression with a colon (:):

var aNumberAsString = $"{aDoubleValue:0.####}";

answered May 9, 2016 at 10:41

lc.

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2 Comments

kmote Over a year ago

The list of possible formatting specifications can be found here (for custom formats) and here (for standard formats)

Alexander Farber Over a year ago

Does not work on my German Windows PC with VS 2022: the double values use comma as decimal separator (instead of a dot).

Ash Burlaczenko · Accepted Answer · 2016-05-09 10:41:50Z

28

A colon after the variable specifies a format,

Console.Write($"{aDoubleValue:0.####}");

answered May 9, 2016 at 10:41

Ash Burlaczenko

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Comments

Rafael · Accepted Answer · 2022-08-27 21:15:05Z

9

Or like this:

Console.Write($"{aDoubleValue:f4}");

answered Aug 27, 2022 at 21:15

Rafael

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