How to Add Text to a Slide Programmatically using C# Open-Source API | FileFormat.Slides

add-text-to-a-slide-programmatically-using-c-sharp.cs

// Create an instance of new presentation
Presentation presentation = Presentation.Create($"{documentDirectory}/{filename}");
// Create an instance of TextShape
TextShape shape = new TextShape();
// Set text of the TextShape
shape.Text = "FileFormat.Slides Text Shape Example";             
// Create Slide
Slide slide = new Slide();
// Add text shapes.
slide.AddTextShapes(shape);               
// Add slide to the presentation
presentation.AppendSlide(slide);
// Save presentation
presentation.Save();