Creating a custom string interpolation handler in C#

Create a class with the following:

Attribute InterpolatedStringHandler applied to the class
Constructor with parameters int literalLength and int formatCount
Public methods AppendLiteral and AppendFormatted:
- public void AppendLiteral(string s)
- public void AppendFormatted<T>(T t)

Notes:

AppendFormatted may have additional parameters int alignment and string format:
- e.g. when using $"{value,-15:red}"
The methods may return bool to stop interpolation at any point.

Know more:

Passing parameters to a string interpolation handler constructor in C#

References:

Explore string interpolation handlers - C# | Microsoft Learn