How is C# string interpolation compiled?

How is C# string interpolation compiled?

C# string interpolation is compiled into a series of string concatenation operations. When the C# compiler encounters a string interpolation expression, it converts the expression into a sequence of calls to the String.Concat method, which concatenates strings together to form the final result.

Here's an example of how a simple string interpolation expression would be compiled:

string name = "Alice";
int age = 30;

string message = $"My name is {name} and I'm {age} years old.";

This would be compiled into the following code:

string name = "Alice";
int age = 30;

string message = string.Concat("My name is ", name, " and I'm ", age, " years old.");

As you can see, the String.Concat method is used to concatenate together the string literals and the variable values. The compiler takes care of converting the interpolated expression into the appropriate sequence of arguments for the String.Concat method.

In some cases, the C# compiler may optimize the code by using the StringBuilder class instead of String.Concat for better performance. However, the final result is still the same: a string that has been constructed by concatenating together multiple strings and variable values.

Examples

  1. Compilation of Basic String Interpolation

    • Description: Shows the compilation of a basic string interpolation statement.
    • Code:
      string name = "John";
string message = $"Hello, {name}!";

  2. Escaping Characters in Interpolated Strings

    • Description: Explores how special characters are handled during compilation in interpolated strings.
    • Code:
      string path = @"C:\folder";
string filePath = $"{path}\\file.txt";

  3. String Interpolation with Expressions and Methods

    • Description: Examines how expressions and method calls within string interpolation are compiled.
    • Code:
      int x = 10;
int y = 20;
string result = $"Sum: {x + y}";

  4. Conditional Compilation in String Interpolation

    • Description: Demonstrates how conditional logic within string interpolation is compiled.
    • Code:
      bool condition = true;
string result = $"The value is {(condition ? "True" : "False")}";

  5. Compilation of Format Specifiers in Interpolated Strings

    • Description: Explores how format specifiers (e.g., alignment and format strings) are compiled.
    • Code:
      double value = 123.456;
string result = $"Formatted: {value:N2}";

  6. Handling Null Values in Interpolated Strings

    • Description: Shows how null values are handled during compilation in interpolated strings.
    • Code:
      string name = null;
string result = $"Hello, {name ?? "Guest"}!";

  7. Compilation of Interpolation within Verbatim Strings

    • Description: Examines how string interpolation is compiled within verbatim strings.
    • Code:
      string path = @"C:\folder";
string result = $@"The path is: {path}";

  8. IL Code for Multiple Interpolations in a Single String

    • Description: Illustrates the IL code generation when multiple interpolations are used in a single string.
    • Code:
      string name = "John";
int age = 30;
string result = $"Name: {name}, Age: {age}";

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