使用System.Xml實作XML檔案建立增删改查

實作XML檔案的建立，子元素的添加，修改，删除。

引用

using System.Xml;

實作方法如下：

建立XML檔案方法

static void CreateXMLFile()

{

XmlDocument xdoc = new XmlDocument();

XmlElement root = xdoc.CreateElement(“MOVIES”);

xdoc.AppendChild(root);

Console.WriteLine(xdoc.InnerXml);

xdoc.Save(“movies.xml”);//可以指定存儲路徑

}

添加元素方法：

static void AddRecordToXML()

{

XmlDocument xdoc = new XmlDocument();

xdoc.Load(“movies.xml”);

XmlNode root = xdoc.SelectSingleNode(“MOVIES”);

XmlElement movie = xdoc.CreateElement(“MOVIE”);

root.AppendChild(movie);

XmlAttribute id = xdoc.CreateAttribute(“Id”);

id.Value = xdoc.SelectNodes(“MOVIES/MOVIE”).Count.ToString();  //“1”;

movie.Attributes.Append(id);

XmlElement title = xdoc.CreateElement(“Title”);

title.InnerText = “The Godfather”;

movie.AppendChild(title);

Console.WriteLine(xdoc.InnerXml);

xdoc.Save(“movies.xml”);

}

讀取元素方法：

static void ReadRecords()

{

XmlDocument xdoc = new XmlDocument();

xdoc.Load(“movies.xml”);

XmlNodeList nodes = xdoc.SelectNodes(“MOVIES/MOVIE”);

foreach (XmlNode node in nodes)

{

//Console.WriteLine(node.Attributes[0].Value);

//Console.WriteLine(node.ChildNodes[0].InnerText);

Console.WriteLine($“{node.Attributes[0].Value}  {node.ChildNodes[0].InnerText}”);

}

}

更新元素方法：

static void UpdateRecords()

{

XmlDocument xdoc = new XmlDocument();

xdoc.Load(“movies.xml”);

XmlNode tgNode = xdoc.SelectSingleNode(“MOVIES/MOVIE[@Id=1]/Title”);

tgNode.InnerText = “Goodfellas”;

Console.WriteLine(xdoc.InnerXml);

xdoc.Save(“movies.xml”);//可以指定存儲路徑

}

删除元素方法：

static void DeleteRecords()

{

XmlDocument xdoc = new XmlDocument();

xdoc.Load(“movies.xml”);

Console.WriteLine($“File Load …: {xdoc.InnerXml}”);

var root = xdoc.SelectSingleNode(“MOVIES”);

Console.WriteLine($“Root Node: {root.InnerXml}”);

var tgNode = root.SelectSingleNode(“MOVIE[Title=‘Lord of the Rings’]”); //xdoc.SelectSingleNode(“MOVIES/MOVIE”);

Console.WriteLine($“Target Node:{tgNode.InnerXml}”);

var tgNode2 = root.SelectSingleNode(“MOVIE[@Id=3]”);

Console.WriteLine($“Target Node2:{tgNode2.InnerXml}”);

root.RemoveChild(tgNode2);

Console.WriteLine(“\n======================\n”);

Console.WriteLine($“Child Node deleted: {xdoc.InnerXml}”);

xdoc.Save(“movies.xml”);

}

測試方法：

static void Main(string[] args)

{

CreateXMLFile();

AddRecordToXML();

ReadRecords();

UpdateRecords();

DeleteRecords();

Console.Read();

}