How to put unprocessed (escaped) words inside String.Format

Question

I am formatting a date:

str = String.Format(\"{0:MMM d m:mm\"+yearStr+\"}\", dt);

I want to put the word \"at\" after the \"d\", but I don\

Answer 1

Using string interpolation (C# 6.0+): (documentation)

var yearStr = "2018";
var dt = DateTime.Now;
var str = $"{dt:MMM d \'at\' H:mm} {yearStr}";

Backslash is optional

var str = $"{dt:MMM d 'at' H:mm} {yearStr}";

see in action: DotnetFiddle