.net - Call F# `printfn` from C#

Question

How can I call F# printfn directly from C# code? I see there's a

T PrintfModule.PrintFormat<T>(PrintfFormat<T, TextWriter, Unit,Unit> format)

For example, I have F# assembly that defines x:

type R = { r: R }
let rec x = { r = x }

In another C# assembly, how can I print x by calling code that is equivalent to printfn "%A" x with PrintfModule.PrintFormatLine?

Answer 1

A shorter version of AlexAtNet's anwser is:

PrintfModule
    .PrintFormatLine(
        new PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit, Program.R>("%A"))
    .Invoke(Program.x);

Although I don't understand why there's a need of casting (PrintfFormat<FSharpFunc<Program.R, Unit>, TextWriter, Unit, Unit>). If someone knows the reason please teach me.