How to make ffmpeg slideshow?

Question

fmpeg

Hello. ffmpeg has a command ffmpeg -framerate 24 -i img%03d.png output.mp4
Here we take all files from a folder named img001.png, img002.png, img003.png etc.
And how to glue files from the list? For example, I received a List of files, but how to transfer them to this command? I do it in C#