C#操作xml文件

上次操作这东西还是第一个项目里面，为了读取xml文件里面的大量的数据操作这东西。

现在突然要写这东西虽然很简单，还是有点生疏，写个demo以备查阅。后面再linq to xml就简单很多。

使用的xml文件demo.xml：

<?xml version="1.0" encoding="utf-8"?>
<connectionstrings>
  <connectionstring id="connstr1">
    <serverAddress>127.0.0.1</serverAddress>
    <dataBase>test</dataBase>
    <userId>sa</userId>
    <password>111222</password>
  </connectionstring>
  <connectionstring id="connstr2">
    <serverAddress>127.0.0.1</serverAddress>
    <dataBase>test</dataBase>
    <userId>sa</userId>
    <password>111222</password>
  </connectionstring>
</connectionstrings>

然后是操作xml的类XmlOperatorDemo.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;

namespace TestDemo
{
    public class XmlOperateDemo
    {
        readonly XmlDocument xmlDoc=new XmlDocument();
        private readonly string xmlPath = "";
        public XmlOperateDemo(string xmlpath)
        {
            xmlDoc.Load(xmlpath);
            xmlPath = xmlpath;
        }

        public void GetNodeValue()
        {
            var list = xmlDoc.GetElementsByTagName("connectionstring");//获取节点列表
            foreach (XmlElement xe in list)
            {
                Console.WriteLine(xe.GetAttribute("id")+":");//获取属性
                Console.WriteLine(xe.InnerXml);//节点内容
                XmlElement address = (XmlElement)xe.SelectSingleNode("serverAddress");//获取节点
                Console.WriteLine("serverAddress:" + address.InnerText);
            }

        }

        public void SetNodeValue()
        {
            var nodecount = xmlDoc.GetElementsByTagName("connectionstring").Count+1;
            var connstr3 = xmlDoc.CreateElement("connectionstring");
            connstr3.SetAttribute("id", "connstr" + nodecount);//设置属性
            XmlElement serverAddress = xmlDoc.CreateElement("serverAddress");
            serverAddress.InnerText = "127.0.0.1";//设置文本内容
            XmlElement dataBase = xmlDoc.CreateElement("dataBase");
            dataBase.InnerText = "test";
            XmlElement userId = xmlDoc.CreateElement("userId");
            userId.InnerText = "sa";
            XmlElement password = xmlDoc.CreateElement("password");
            password.InnerText = "111222";
            connstr3.AppendChild(serverAddress);
            connstr3.AppendChild(dataBase);
            connstr3.AppendChild(userId);
            connstr3.AppendChild(password);
           
            Console.WriteLine("---new connstr---:");
            Console.WriteLine(connstr3.InnerXml);
            var root= xmlDoc.SelectSingleNode("connectionstrings");//根节点
            root.AppendChild(connstr3);// 添加节点
            xmlDoc.Save(xmlPath);//保存
            Console.WriteLine("after nodeadding:");
            GetNodeValue();


        }

        public void DeleteNode()
        {
            Console.WriteLine("before delete-----------------------:");
            GetNodeValue();
            var root = xmlDoc.SelectSingleNode("connectionstrings");
            var node=root.SelectSingleNode("connectionstring");
　　　　　　　//删除节点
            root.RemoveChild(node);
            xmlDoc.Save(xmlPath);
            Console.WriteLine("after delete-----------------------:");
            GetNodeValue();

        }

    }
}

测试主方法：

 static void Main(string[] args)
        {
            var xmldemo=new XmlOperateDemo(@"D:\visual studio\TestDemo\TestDemo\demo.xml");
            //xmldemo.GetNodeValue();
            //xmldemo.SetNodeValue();
            xmldemo.DeleteNode();

            Console.Read();
        }