public static void Main()
        {
            AnnotationHead an = new AnnotationHead();
            an.folder = "sandbox";
            an.filename = "2022-10-29 15-19-25";
            an.path = "F:/sandbox/2022-10-29 15-19-25.png";
            Source source = new Source();
            source.database = "Unknown";
            an.source = source;
            Size size = new Size();
            size.width = "18443";
            size.height = "935";
            size.depth = "3";
            an.size = size;
            an.segmented = "0";
            robndClass il = new robndClass();
            il.cx = (float)1484.1;
            il.cy = (float)521.7274;
            il.w = (float)40.1731;
            il.h = (float)194.3416;
            il.angle = (float)0.18;
            @object o = new @object();
            o.type = "robndbox";
            o.name = "ship";
            o.pose = "Unspecified";
            o.truncated = "0";
            o.difficult = "0";
            o.robndbox = il;
            List<@object> objectList = new List<@object>();
            objectList.Add(o);
            objectList.Add(o);
            objectList.Add(o);
            objectList.Add(o);
            objectList.Add(o);
            AnnotationClass ac = new AnnotationClass(an,objectList,"r2.xml");
            ac.action();
        }
    }
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.IO;
using System.Xml.Serialization;
namespace ConsoleApp1
{
    [XmlRoot("annotation")]
    public class AnnotationHead
    {
        public string folder;
        public string filename;
        public string path;
        public Source source;
        public Size size;
        public string segmented;
    }
    public class Size
    {
        public string width;
        public string height;
        public string depth;
    }
    public class Source
    {
        public string database;
    }
    [XmlRoot("object")]
    public class @object
    {
        public string type;
        public string name;
        public string pose;
        public string truncated;
        public string difficult;
        public robndClass robndbox;
    }
    public class robndClass
    {
        public float cx;
        public float cy;
        public float w;
        public float h;
        public float angle;
    }
    class AnnotationClass
    {
        private string strOutName;//輸出檔名稱
        private AnnotationHead an;
        private List<@object> objectList;
        //建構函式
        public AnnotationClass(AnnotationHead annotatonHead, List<@object> olist, string strName = "result.xml")
        {
            an = annotatonHead;
            strOutName = strName;
            objectList = olist;
        }
        public void action()
        {
            //輸出規則
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            settings.IndentChars = "    ";
            settings.NewLineChars = "\r\n";
            settings.Encoding = Encoding.UTF8;
            settings.OmitXmlDeclaration = true;  // 不生成宣告頭
            XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
            namespaces.Add(string.Empty, string.Empty);
            //輸出物件
            FileStream stream = new FileStream("part1.xml", FileMode.Create);
            /////////////////////////Part1///////////////////////////////////
            //實施輸出
            XmlWriter xmlWriter = XmlWriter.Create(stream, settings);
            XmlSerializer serializer = new XmlSerializer(typeof(AnnotationHead));
            serializer.Serialize(xmlWriter, an, namespaces);
            //目標銷燬
            xmlWriter.Close();
            stream.Close();
            /////////////////////////Part2///////////////////////////////////
            stream = new FileStream("part2.xml", FileMode.Create);
            //定義方法
            serializer = new XmlSerializer(typeof(List<@object>));
            XmlWriter xmlWriter2 = XmlWriter.Create(stream, settings);
            serializer.Serialize(xmlWriter2, objectList, namespaces);
            xmlWriter2.Close();
            stream.Close();
            ///////////////////////////merge//////////////////////////////////////////
            StreamReader sr = new StreamReader("part1.xml");
            string strPart1 = sr.ReadToEnd();
            strPart1 = strPart1.Substring(0, strPart1.Length - 13);
            sr.Close();
            sr = new StreamReader("part2.xml");
            string strPart2 = sr.ReadToEnd();
            strPart2 = strPart2.Substring(15, strPart2.Length - 31);
            sr.Close();
            string strOut = strPart1 + strPart2 + "</annotation>";
            ////////////////////////////輸出///////////////////////////////////////
            using (StreamWriter sw = new StreamWriter(strOutName))
            {
                sw.Write(strOut);
            }
        }
    }
}