TechieClues TechieClues
Updated date Nov 14, 2021
String Interpolation In C#
  • 1.8k
  • 0
  • 0

String Interpolation is one of the C# 6 feature, the special character identifies a string literal as an interpolated string. 

We normally use String.Format method to construct strings, this method is useful but its usage is a bit difficult, you have to mention the number placeholder in the format string which should be lineup with separate specified arguments.

String.Format Usage:

string.Format("I have {0} cars, {1} motorbike and {2} bicycle.", 2, 3, 1);
// Output
// I have 2 cars, 3 motorbike and 1 bicycle.

Using string interpolation, we can easily construct, format the string easily and quickly. Syntax of string interpolation should start with a ‘$’ symbol and expressions should be defined within a bracket {}.

string firstName = "John";  
string lastName = "Mathews";
string strMessage = $"Hi {firstName} {lastName}, Welcome!!!";  
Console.WriteLine(strMessage); 

// Output
// Hi John Mathews, Welcome!!!

The below example shows how to creates a string by concatenating the values of multiple types of variables. 

string firstName = "John";  
string lastName = "Mathews";
int years = 35;
string strMessage = $"{firstName} {lastName} is {years} years old.";  
Console.WriteLine(strMessage); 

// Output
// John Mathews is 35 years old.

The below example explains how to create a string with 15 spacing before the text (i.e, years)

string firstName = "John";
string lastName = "Mathews";
int years = 35;
string strMessage = $"{firstName} {lastName} {years, 15}";
Console.WriteLine(strMessage);
// Output
// John Mathews                35

Expression:

The below example uses an expression in a string interpolation operation and the conditional expression should be parenthesized.

string firstName = "John";
string lastName = "Mathews";
int age = 35;  // 35 or 1
string strMessage = $"{firstName} {lastName} is {age} year{(age == 1 ? "" : "s")} old!!!";
Console.WriteLine(strMessage);

// Input 1 : age = 35 
// Output - 1
// John Mathews is 35 years old!!!

// Input 2 : age = 1
// Output - 2
// John Mathews is 1 year old!!!

ABOUT THE AUTHOR

TechieClues
TechieClues

I specialize in creating and sharing insightful content encompassing various programming languages and technologies. My expertise extends to Python, PHP, Java, ... For more detailed information, please check out the user profile

https://www.techieclues.com/profile/techieclues

Comments (0)

There are no comments. Be the first to comment!!!