String Interpolation: A New Feature of C# 6.0

var message = string.Format("Book Name : {0} Price : {1}", name, price);

String Interpolation will help developers to use the actual variables as placeholders. Developers can directly use the actual variables as placeholders using String Interpolation, which can be looked at as an improvement. Therefore, the preceding code snippet can be re-written as.

var message = $"Book Name: \{name} Price: \{price}";

Example 2

public static void Main(string[] args)
{
    int a = 5, b = 10;
    Console.WriteLine(" The value A is \{a} while B is \{b}");
    Console.ReadKey();
}

Example 3

public static void Main(string[] args)
{
    string value1 = "Abhishek";
    string value2 = "Arora";
    string stringValue1 = string.Format("{0} {1}", value1, value2);    // With string.Format
    Console.WriteLine(stringValue1);
    string stringValue2 = $"{value1} {value2}";      // With String Interpolation
    Console.WriteLine(stringValue2);
}

Demo Application using Visual Studio 2013.

using System;
using System.Text;
namespace CSharpFeatures
{
    class StringInterpolation
    {
        public string Name { get; set; }
        public string Location { get; set; }
        public string Age { get; set; }
        public string Email { get; set; }
        static void Main(string[] args)
        {
            StringInterpolation s = new StringInterpolation();
            s.Name = "Abhishek Arora";
            s.Location = "Ghaziabad";
            s.Age = "23";
            s.Email = "[email protected]";
            Console.WriteLine("\n -- Old way of string concatenation using '+' Operator --");
            Console.WriteLine(" My Name is " + s.Name + ". I am from " + s.Location + ". I am " + s.Age + " years old. You can\n contact me at " + s.Email);
            Console.WriteLine("\n\n -- Old way of string concatenation using String.Format Method --");
            Console.WriteLine(string.Format(" My Name is {0}. I am from {1}. I am {2} years old. You can\n contact me at {3} ", s.Name, s.Location, s.Age, s.Email));
            Console.ReadKey();
        }
    }
}

Demo Application using Visual Studio 2015 Preview.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CSharpFeatures
{
    class StringInterpolation
    {
        public string Name { get; set; }
        public string Location { get; set; }
        public string Age { get; set; }
        public string Email { get; set; }

        static void Main(string[] args)
        {
            StringInterpolation s = new StringInterpolation();
            s.Name = "Abhishek Arora";
            s.Location = "Ghaziabad";
            s.Age = "23";
            s.Email = "[email protected]";
            Console.WriteLine("\n -- using String Interpolation Method with VS 2015 preview --");
            Console.WriteLine("\n My name is \{s.Name}. I am from \{s.Location}. I am \{s.Age} years old. You can\n contact me at \{s.Email}");
            Console.WriteLine("\n\n -- Condition Checking -- ");
            int totalamount = 2500;
            Console.WriteLine("\n Congrats \{s.Name} \{totalamount == 2500 ? "you are eligible for 10% discount!" : " No Discount"}");
            Console.ReadKey();
        }
    }
}

Summary

In this article, we learned how to use String Interpolation without the use of string. Format. I hope you liked this new feature of C# 6.0 introduced by Microsoft. Don't forget to read my other articles on the series "A new feature of C# 6.0". Share your opinion about this feature and how will you use it in your project. Your comments are most welcome.