C# String Interpolation

C# string interpolation allows us to insert variables into the string. It uses simple syntax and looks like a template. An interpolated string returns a string as a result.

A typical structure of interpolated string is given below.

Syntax

$"<text> {<interpolated-expression> [,<field-width>] [<:format-string>] } <text> ..."  

Curly braces ({}) are used to enclose and separate variable into the interpolated string.

C# String Interpolation Example

using System;
namespace CSharpFeatures
{
    class StringInterpolation
    {
        public static void Main()
        {
            var name = "Peter";
            var age  = 30;
            // Composit format string
            Console.WriteLine("Name = {0}, age = {1}", name, age);
            // String Interpolation
            var s1   = $"{name} is {age} years old.";
            Console.WriteLine(s1);
        }
    }
}

Output

Name = Peter, age = 30
Peter is 30 years old.

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