How to escape braces (curly brackets) in a format string in .NET

Question

How can brackets be escaped in using string.Format.

For example:

String val = \"1,2,3\"
String.Format(\" foo {{0}}\", val); 
         


        

Answer 1

Escaping curly brackets AND using string interpolation makes for an interesting challenge. You need to use quadruple brackets to escape the string interpolation parsing and string.format parsing.

Escaping Brackets: String Interpolation $("") and String.Format

string localVar = "dynamic";
string templateString = $@"
{0}
this is my {localVar} template using a {{{{custom tag}}}}
";
string result = string.Format(templateString, "String Interpolation");

// OUTPUT: 
String Interpolation
this is my dynamic template using a {custom tag}