String Interpolation

String Interpolation Expression allows to simplify code generation associated with string formatting. This feature is powered by string interpolation in C# and VB.NET.

In Metaprogramming library, interpolated string expression is represented by InterpolationExpression class.

using DotNext.Linq.Expressions;
using static DotNext.Linq.Expressions.InterpolationExpression;
using static DotNext.Metaprogramming.CodeGenerator;

Lambda<Action<int, int>>(fun =>
{
	var (x, y) = fun;
	WriteLine(PlainString($"Sum of {x} and {y} is {x.Add(y)}"));
});

//generated code is

new Action<int, int>(x, y => Console.WriteLine($"Sum of {x} and {y} is {x + y}"));

PlainString factory method converts interpolated string into expression node of type String. So, at runtime, it will be represented as formatted string.

FormattableString factory method converts interpolated string into expression node of type FormattableString. It can be helpful to change the culture of the string at runtime