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} ...."

Answer 1

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

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

Answer 2

A colon after the variable specifies a format,

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