How to interpolate strings in C#?

How to interpolate strings in C#?

In C#, you can interpolate strings using the string interpolation feature, which allows you to embed expressions directly within a string. String interpolation simplifies the process of building dynamic strings by automatically converting the expressions to their string representations.

To interpolate a string, you need to prefix the string with the $ symbol, and then use curly braces { } to enclose the expressions you want to include. Here's an example:

string name = "Alice"; int age = 30; string message = $"Hello, {name}! You are {age} years old."; Console.WriteLine(message);

In the above code, the variables name and age are interpolated within the string message using the { } syntax. When the message string is printed using Console.WriteLine, the expressions {name} and {age} are replaced with their respective values.

The output will be:

Hello, Alice! You are 30 years old.

String interpolation supports not only variables but also any valid C# expression within the curly braces. For example, you can perform calculations or call methods:

double radius = 3.5; double area = Math.PI * radius * radius; string result = $"The area of a circle with radius {radius} is {area}"; Console.WriteLine(result);

The output will be:

The area of a circle with radius 3.5 is 38.48451000647496

String interpolation offers a concise and readable way to construct dynamic strings by directly embedding expressions within them.

Examples

  1. "String interpolation in C#"

    • Description: Learn the basic syntax of string interpolation in C# for concise and readable string formatting.
    • Code:
      string name = "John"; int age = 30; string message = $"Hello, my name is {name} and I am {age} years old.";

  2. "Format strings using interpolated strings in C#"

    • Description: Explore how to use interpolated strings to format complex expressions and variables in C#.
    • Code:
      decimal price = 29.99m; int quantity = 2; string invoice = $"Total cost: {price * quantity:C}";

  3. "Embed expressions within strings in C#"

    • Description: Understand how to embed expressions directly within strings using C# interpolated strings.
    • Code:
      int x = 5; int y = 10; string result = $"The sum of {x} and {y} is {x + y}.";

  4. "Conditional interpolation in C#"

    • Description: Use conditional statements within interpolated strings for dynamic content based on conditions.
    • Code:
      bool isAdmin = true; string greeting = $"Welcome{(isAdmin ? ", Admin" : "")}!";

  5. "Interpolate DateTime objects in C#"

    • Description: Interpolate DateTime objects into strings with custom formatting using C#.
    • Code:
      DateTime currentDate = DateTime.Now; string formattedDate = $"Current date and time: {currentDate:yyyy-MM-dd HH:mm:ss}";

  6. "Interpolate collection elements in C#"

    • Description: Use interpolated strings to concatenate elements from collections within a formatted string.
    • Code:
      List<string> fruits = new List<string> { "Apple", "Banana", "Orange" }; string message = $"My favorite fruits are: {string.Join(", ", fruits)}";

  7. "Numeric formatting with interpolated strings in C#"

    • Description: Format numeric values with precision using interpolated strings in C#.
    • Code:
      double pi = Math.PI; string formattedPi = $"The value of pi is approximately {pi:F3}";

  8. "Escape characters in interpolated strings in C#"

    • Description: Learn how to escape characters and include special characters within interpolated strings.
    • Code:
      string escapedString = $"This is an escaped string: {{ brackets }}";

  9. "Multiline strings with interpolation in C#"

    • Description: Create multiline strings with interpolated expressions for better code readability.
    • Code:
      string multilineMessage = $@" Hello, This is a multiline message. Current date: {DateTime.Now:yyyy-MM-dd}";

  10. "Localization and culture-specific formatting in C#"

    • Description: Use interpolated strings for localization and culture-specific formatting in C#.
    • Code:
      int number = 12345; string localizedNumber = $"{number:N0}"; // Format with thousands separator based on culture

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