What Does the `$` Prefix Mean in C# String Interpolation?

What is the Significance of the $ Prefix in C# String Interpolation?

In C#, the $ symbol preceding a string (like "$"text") is a shorthand notation for String.Format, which relates to string interpolations, a new feature introduced in C# 6.

Usage in String Interpolation

Typically, the $ prefix is used to incorporate other values into strings. Prior to C# 6, this required using String.Format as shown below:

var anInt = 1;
var aBool = true;
var aString = "3";
var formated = string.Format("{0},{1},{2}", anInt, aBool, aString);

With string interpolation, this becomes much simpler:

var anInt = 1;
var aBool = true;
var aString = "3";
var formated = $"{anInt},{aBool},{aString}";

Alternative Format Using $@

An alternative form of string interpolation that blends the capabilities of $"" and @"" is $@. This allows for the use of string interpolations within verbatim strings without requiring the use of throughout your string.

For example, the following lines:

var someDir = "a";
Console.WriteLine($@"c:\{someDir}\b\c");

will output:

c:\a\b\c

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