層級字典構造：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace test1
{
    public class ToDic
    {
        public ToDic(Annotation annotation)
        {
            _annotation = annotation;
        }
        
 
public Annotation _annotation;
        public class Annotation
        {
            public string _folder;
            public string _filename;
            public string _path;
            public Source _source;
            public Size _size;
            public string _segmented;
            public
 
 _Object _object1;
            public _Object _object2;

            public Annotation(string folder,
                string filename,
                string path,
                Source source,
                Size size,
                string segmented,
                _Object object1 = null,
                _Object object2 
 
= null)//構造器
            {
                _folder = folder;
                _filename = filename;
                _path = path;
                _source = source;
                _size = size;
                _segmented = segmented;
                _object1 = object1;
                _object2 = object2;
            }
            
            public class Source
            {
                public string _database;

                public Source(string database)//構造器
                {
                    _database = database;
                }
            }

            public class Size
            {
                public string _width;
                public string _height;
                public string _depth;

                public Size(string width,
                    string height,
                    string depth)//構造器
                {
                    _width = width;
                    _height = height;
                    _depth = depth;
                }
            }

            public class _Object
            {
                public string _name;
                public string _pose;
                public string _truncated;
                public string _difficult;
                public Bndbox _bndbox;

                public _Object(string name, 
                    string pose,
                    string truncated,
                    string difficult,
                    Bndbox bndbox)//構造器
                {
                    _name = name;
                    _pose = pose;
                    _truncated = truncated;
                    _difficult = difficult;
                    _bndbox = bndbox;
                }


                public class Bndbox
                {
                    public string _xmin;
                    public string _ymin;
                    public string _xmax;
                    public string _ymax;

                    public Bndbox(string xmin,
                        string ymin,
                        string xmax,
                        string ymax)//構造器
                    {
                        _xmin = xmin;
                        _ymin = ymin;
                        _xmax = xmax;
                        _ymax = ymax;
                    }
                }
            }
        }

        

        public static Dictionary<string, object> ToDictionary(object o)
        {
            if (o == null)
            {
                return null;
            }
            var fileds = o.GetType().GetFields();
            Dictionary<string,object> dic = new Dictionary<string, object>();
            
            foreach (var field in fileds)
            {
                if (field != null)
                {
                    if (field.FieldType == typeof(string))
                    {
                        dic.Add(field.Name, field.GetValue(o));
//                        foreach (var kvp in dic)
//                        {
//                            Console.WriteLine($"{kvp.Key}:{kvp.Value}");
//                        }
                    }
                    else
                    {
                        dic.Add(field.Name, ToDictionary(field.GetValue(o)));
                    }
                }
            }
            return dic;
        }
        
    }
}

/// <summary>
        /// 遞迴列印字典
        /// </summary>
        /// <param name="o"></param>
        /// <param name="emp"></param>
        public static void LoopPrint(object o, string emp = "")
        {
            Dictionary<string, object> dic = o as Dictionary<string, object>;
            
            if (dic==null)
            {
                return;
            }
            foreach (var kvp in dic)
            {
                if (kvp.Value == null)
                {
                    return;
                }
                if (kvp.Value.GetType() == typeof(string))
                {
                    Console.WriteLine(emp + $"{kvp.Key}:{kvp.Value}");
                }
                else
                {
                    Console.WriteLine(emp + $"{kvp.Key}:");
                    LoopPrint(kvp.Value, emp + "    ");
                    Console.WriteLine(emp + $"{kvp.Key}");
                }
            }
        }