using System;

using System.Text.Json;

​

      public class SketchGeom

      {

          public string Type { get; set; }

          public double[] Start { get; set; }

          public double[] End { get; set; }

      }

     public class SectionLine

    {

        public string Label { get; set; }

        public string Type { get; set; }

       public SketchGeom[] SketchGeoms { get; set; }      

    }

    public class DrawingView

    {

        public string Type {get; set;}      

        public string Name {get; set;}

        public double[] Position { get; set; }

        public double ScaleNumerator {get;set;}

        public double ScaleDenominator {get;set;}

        public double[] Viewdirection { get; set; }

        public string ParentView { get; set;}

        public SectionLine SectionLine { get; set; }

    }

     public class Sheet

    {

         public string Name {get; set;}

         public double ScaleNumerator {get;set;}

         public double ScaleDenominator {get;set;}

         public DrawingView[] Views { get; set; }    

    }

     public class Drawing

    {

        public Sheet[] Sheets { get; set; }      

    }

    class Program

    {

        public static void Main()

        {

            DrawingView view= new DrawingView() {Name="View1", Viewdirection = [1.0, 0, 0], Position= [1.0, 2.0, 3.0], Type = "ORTHOGONAL", ScaleNumerator = 1.0, ScaleDenominator= 1.0, };

            SketchGeom[] skG = new SketchGeom[1];

            SketchGeom sk = new SketchGeom() { Type="LINE", Start=[.025, 0.35, 0], End=[.055, 0.35, 0]};

            skG[0] = sk;

            SectionLine SecLine = new SectionLine() {Label="A", Type="Normal", SketchGeoms = skG};

            DrawingView section= new DrawingView() { Position= [2.0, 3.0, 4.0], Type = "SECTION", ParentView= "View1", SectionLine = SecLine, ScaleNumerator = 1.0, ScaleDenominator= 1.0,  };

            DrawingView view2= new DrawingView() { Viewdirection = [0.0, 0.0, 1.0], Position= [3.0, 4.0, 5.0], Type = "ORTHOGONAL", ScaleNumerator = 1.0, ScaleDenominator= 1.0,  };

            DrawingView[] Views= new DrawingView[3];

            Views[0] = view;

            Views[1] = view2;

            Views[2] = section;

            Sheet[] Sheets= new Sheet[1];

            Sheets[0] = new Sheet {ScaleNumerator = 1.0, ScaleDenominator= 1.0, Views = Views};

            Drawing drw = new Drawing { Sheets = Sheets};

            var opt = new JsonSerializerOptions(){ WriteIndented=true };

            string strJson = JsonSerializer.Serialize<Drawing>(drw, opt);

            Console.WriteLine(strJson);

        }

    }

​