解決問題帖子地址：點擊打開鏈接

解決代碼：

namespace ConsoleApp2 {using System.Xml;using System.Collections.Generic;class Program{static void Main(string[] args){//初始化測試數據Folder folder = new Folder() { name = "MYNAEM" };IList<Placemark> placemarks = new List<Placemark>();placemarks.Add(new Placemark() { name = "20177", Point = new Point() { coordinates = "99.9298,26.51303" } });placemarks.Add(new Placemark() { name = "20178", Point = new Point() { coordinates = "99.9312,26.51302" } });placemarks.Add(new Placemark() { name = "20179", Point = new Point() { coordinates = "99.9358,26.51305" } });folder.Placemarks = placemarks;//構建XMLXmlDocument xmlDocument = new XmlDocument();XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0", "UTF-8", null);xmlDocument.AppendChild(xmlDeclaration);XmlNode folderNode = xmlDocument.CreateNode(XmlNodeType.Element, "Folder", null);XmlNode folderNameNode = xmlDocument.CreateNode(XmlNodeType.Element, "name", null);folderNameNode.InnerText = folder.name;folderNode.AppendChild(folderNameNode);foreach (var placemark in placemarks){XmlNode placemarkNode = xmlDocument.CreateNode(XmlNodeType.Element, "Placemark", null);XmlNode placemarkNameNode = xmlDocument.CreateNode(XmlNodeType.Element, "name", null);placemarkNameNode.InnerText = placemark.name;XmlNode pointNode = xmlDocument.CreateNode(XmlNodeType.Element, "Point", null);XmlNode coordinatesNode = xmlDocument.CreateNode(XmlNodeType.Element, "coordinates", null);coordinatesNode.InnerText = placemark.Point.coordinates;pointNode.AppendChild(coordinatesNode);placemarkNode.AppendChild(placemarkNameNode);placemarkNode.AppendChild(pointNode);folderNode.AppendChild(placemarkNode);}xmlDocument.AppendChild(folderNode);xmlDocument.Save("D:\\my.xml");}}class Folder{public string name { get; set; }public IList<Placemark> Placemarks { get; set; }}class Placemark{public string name { get; set; }public Point Point { get; set; }}class Point{public string coordinates { get; set; }} }

解決結果：

<?xml version="1.0" encoding="UTF-8"?> <Folder><name>MYNAEM</name><Placemark><name>20177</name><Point><coordinates>99.9298,26.51303</coordinates></Point></Placemark><Placemark><name>20178</name><Point><coordinates>99.9312,26.51302</coordinates></Point></Placemark><Placemark><name>20179</name><Point><coordinates>99.9358,26.51305</coordinates></Point></Placemark> </Folder>

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