本文实例讲述了C#针对xml的基本操作及保存配置文件应用,分享给大家供大家参考。具体方法如下:
引言:这里首先介绍了xml的基本操作,后面写了一个经常用到的xml保存配置文件的实例。
xml常用方法:
定义xml文档:XmlDocument xmlDoc = new XmlDocument();
初始化xml文档:xmlDoc.Load("D:\\book.xml");//找到xml文件
创建根元素:XmlElement xmlElement = xmlDoc.CreateElement("", "Employees", "");
创建节点:XmlElement xeSub1 = xmlDoc.CreateElement("title");
查找Employees节点:XmlNode root = xmlDoc.SelectSingleNode("Employees");
添加节点:xe1.AppendChild(xeSub1);
更改节点的属性:xe.SetAttribute("Name", "李明明");
移除xe的ID属性:xe.RemoveAttribute("ID");
删除节点title:xe.RemoveChild(xe2);
1 创建xml文档
因为比较简单,直接写方法及结果。
public void CreateXMLDocument() { XmlDocument xmlDoc = new XmlDocument();//加入XML的声明段落,<?xml version="1.0" encoding="gb2312"?> XmlDeclaration xmlDeclar; xmlDeclar = xmlDoc.CreateXmlDeclaration("1.0", "gb2312", null); xmlDoc.AppendChild(xmlDeclar);
//加入Employees根元素 XmlElement xmlElement = xmlDoc.CreateElement("", "Employees", ""); xmlDoc.AppendChild(xmlElement);
//添加节点 XmlNode root = xmlDoc.SelectSingleNode("Employees"); XmlElement xe1 = xmlDoc.CreateElement("Node"); xe1.SetAttribute("Name", "李明"); xe1.SetAttribute("ISB", "2-3631-4");
//添加子节点 XmlElement xeSub1 = xmlDoc.CreateElement("title"); xeSub1.InnerText = "学习VS"; xe1.AppendChild(xeSub1);
XmlElement xeSub2 = xmlDoc.CreateElement("price"); xe1.AppendChild(xeSub2); XmlElement xeSub3 = xmlDoc.CreateElement("weight"); xeSub3.InnerText = "20"; xeSub2.AppendChild(xeSub3);
root.AppendChild(xe1); xmlDoc.Save("D:\\book.xml");//保存的路径 }
结果:
<?xml version="1.0" encoding="GB2312"?> -<Employees>-<Node ISB="2-3631-4" Name="李明">
<title>学习VS</title>-
<price>
<weight>20</weight>
</price>
</Node>
</Employees>
2 增加节点
XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load("D:\\book.xml");//找到xml文件 XmlNode root = xmlDoc.SelectSingleNode("Employees");//查找Employees节点 XmlElement xe1 = xmlDoc.CreateElement("Node2");//添加Node2节点 xe1.SetAttribute("Name", "张三"); XmlElement xeSub1 = xmlDoc.CreateElement("title");//定义子节点 xeSub1.InnerText = "心情好"; xe1.AppendChild(xeSub1);//添加节点到Node2 root.AppendChild(xe1);//添加节点到Employees xmlDoc.Save("D:\\book.xml");
结果:
<?xml version="1.0" encoding="GB2312"?> -<Employees>-<Node ISB="2-3631-4" Name="李明">
<title>学习VS</title>-
<price>
<weight>20</weight>
</price>
</Node>-
<Node2 Name="张三">
<title>心情好</title>
</Node2>-
<Node2 Name="张三">
<title>心情好</title>
</Node2>
</Employees>
3 修改节点:
public void ModifyNode() { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load("D:\\book.xml");XmlNodeList nodeList = xmlDocument.SelectSingleNode("Employees").ChildNodes;//获取Employees节点的所有子节点
foreach (XmlNode xn in nodeList)//遍历 { XmlElement xe = (XmlElement)xn; if (xe.GetAttribute("Name") == "李明") { xe.SetAttribute("Name", "李明明");//更改节点的属性
XmlNodeList xnl = xe.ChildNodes;//获取xe的所有子节点 foreach (XmlNode xn1 in xnl) { XmlElement xe2 = (XmlElement)xn1;//将节点xn1的属性转换为XmlElement if (xe2.Name == "title")//找到节点名字为title的节点 { xe2.InnerText = "今天天气不好"; }
if (xe2.Name == "price") { XmlNodeList xnl2 = xe2.ChildNodes; foreach (XmlNode xn2 in xnl2) { if (xn2.Name == "weight") { xn2.InnerText = "88"; } } } } } }
xmlDocument.Save("D:\\book2.xml"); }
运行结果:
<?xml version="1.0" encoding="GB2312"?> -<Employees> -<Node ISB="2-3631-4" Name="李明明"> <title>今天天气不好</title>-<price> <weight>88</weight> </price> </Node> -<Node2 Name="张三"> <title>心情好</title> </Node2></Employees>
4 删除节点:
public void DeleteNode() { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load("D:\\book1.xml");XmlNodeList xnl = xmlDocument.SelectSingleNode("Employees").ChildNodes;
foreach (XmlNode xn in xnl) { if (xn.Name == "Node") { XmlElement xe = (XmlElement)xn;//将xn的属性转换为XmlElement xe.RemoveAttribute("ID");//移除xe的ID属性 XmlNodeList xnl2 = xe.ChildNodes; for (int i = 0; i < xnl2.Count; i++) { XmlElement xe2 = (XmlElement)xnl2.Item(i); if (xe2.Name == "title") { xe.RemoveChild(xe2);//删除节点title } } } }
xmlDocument.Save("D:\\book3.xml"); }
结果:
<?xml version="1.0" encoding="GB2312"?> -<Employees> -<Node ISB="2-3631-4" Name="李明">-<price> <weight>20</weight> </price> </Node>- <Node2 Name="张三"> <title>心情好</title> </Node2>- <Node2 Name="张三"> <title>心情好</title> </Node2> </Employees>
前面介绍了xml的创建、节点的添加、节点的修改和删除,下面以写的一个保存项目配置文件的小例子。
举例说明:
首先在项目文件中创建一个xml文档:
<?xml version="1.0" encoding="utf-8" ?> <configurationN> <ServerAddress>1143</ServerAddress> <ID>192.168</ID> </configurationN>
在保存配置文件时,最主要使用了两个方法:Load和Save。
Load:初始化xml文档,以便项目文件获取具体的xml节点的值。
public void Load(string path) { try { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load(path);XmlNodeList xnl = xmlDocument.SelectSingleNode(managerNode).ChildNodes; foreach (XmlNode xn in xnl) { if (xn.Name == configuration_ServerAddress) { ServerAddress = xn.InnerText; } } } catch(Exception ex) { } }
Save:在项目系统中进行修改配置文件值后,需要对xml进行重新保存
public void Save(string path) { try { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load(path);XmlNodeList xnl = xmlDocument.SelectSingleNode(managerNode).ChildNodes; foreach (XmlNode xn in xnl) { if (xn.Name == configuration_ServerAddress) { xn.InnerText = ServerAddress; } }
xmlDocument.Save(path); } catch (Exception ex) { } }
此处将所有代码都贴出来,方便下次实现。因为项目是WPF文件,而且都是简单控件,所以只贴出后台代码。
class ConfigurationManager:INotifyPropertyChanged { public const string managerNode = "configurationN";//根节点 public const string configuration_ServerAddress = "ServerAddress";//子节点private string _ServerAddress; public string ServerAddress { get { return _ServerAddress; } set { _ServerAddress = value; NotifyPropertyChanged("ServerAddress"); } }
public void Load(string path) { try { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load(path);
XmlNodeList xnl = xmlDocument.SelectSingleNode(managerNode).ChildNodes; foreach (XmlNode xn in xnl) { if (xn.Name == configuration_ServerAddress) { ServerAddress = xn.InnerText; } } } catch(Exception ex) { } }
public void Save(string path) { try { XmlDocument xmlDocument = new XmlDocument(); xmlDocument.Load(path);
XmlNodeList xnl = xmlDocument.SelectSingleNode(managerNode).ChildNodes; foreach (XmlNode xn in xnl) { if (xn.Name == configuration_ServerAddress) { xn.InnerText = ServerAddress; } }
xmlDocument.Save(path); } catch (Exception ex) { } }
public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } }
public static ConfigurationManager Instance = new ConfigurationManager(); }
public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Start(); this.tb1.Text = ConfigurationManager.Instance.ServerAddress.ToString();
} private string path = "CONFIG\\System.xml";
private void button1_Click(object sender, RoutedEventArgs e) { ConfigurationManager.Instance.ServerAddress = this.tb1.Text; ConfigurationManager.Instance.Save(path); }
private void button2_Click(object sender, RoutedEventArgs e) { Application.Current.Shutdown(); }
private void Start() { ConfigurationManager.Instance.Load(path); } }
PS:这里再为大家提供几款关于xml操作的在线工具供大家参考使用:
在线XML/JSON互相转换工具:
http://tools.jb51.net/code/xmljson
在线格式化XML/在线压缩XML:
http://tools.jb51.net/code/xmlformat
XML在线压缩/格式化工具:
http://tools.jb51.net/code/xml_format_compress
希望本文所述对大家的C#程序设计有所帮助。