String interpolation allows the developer to combine variables and text to form a string.

Basic Example

Two int variables are created: foo and bar.

int foo = 34;
int bar = 42;

string resultString = $"The foo is {foo}, and the bar is {bar}.";

Console.WriteLine(resultString);

Output:

The foo is 34, and the bar is 42.

View Demo

Braces within strings can still be used, like this:

var foo = 34;
var bar = 42;

// String interpolation notation (new style)
Console.WriteLine($"The foo is {{foo}}, and the bar is {{bar}}.");

This produces the following output:

The foo is {foo}, and the bar is {bar}.

Using interpolation with verbatim string literals

Using @ before the string will cause the string to be interpreted verbatim. So, e.g. Unicode characters or line breaks will stay exactly as they’ve been typed. However, this will not effect the expressions in an interpolated string as shown in the following example:Console.WriteLine($@“In case it wasn’t clear: \u00B9 The foo is {foo}, and the bar is {bar}.”); Output:

In case it wasn’t clear:

\u00B9

The foo

is 34,

and the bar

is 42.