在C#中读取XML文件，就像读取App.Config文件一样

using System;
using System.Configuration;

class Program
{
    static void Main()
    {
        // 读取AppSettings中的配置项
        string mySetting = ConfigurationManager.AppSettings["MySetting"];
        Console.WriteLine("MySetting: " + mySetting);

        // 读取ConnectionStrings中的连接字符串
        string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
        Console.WriteLine("ConnectionString: " + connectionString);
    }
}

<configuration>
  <appSettings>
    <add key="MySetting" value="SomeValue"/>
  </appSettings>
  <connectionStrings>
    <add name="MyConnectionString" connectionString="Data Source=.;Initial Catalog=MyDB;Integrated Security=True"/>
  </connectionStrings>
</configuration>

using System;
using System.Xml;

class Program
{
    static void Main()
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load("path_to_your_xml_file.xml");

        // 读取节点值
        XmlNode node = xmlDoc.SelectSingleNode("//NodeName");
        if (node != null)
        {
            Console.WriteLine(node.InnerText);
        }
    }
}

using System;
using System.Linq;
using System.Xml.Linq;

class Program
{
    static void Main()
    {
        XDocument xdoc = XDocument.Load("path_to_your_xml_file.xml");

        // 使用LINQ查询XML
        var nodes = from n in xdoc.Descendants("NodeName")
                    select n;

        foreach (var node in nodes)
        {
            Console.WriteLine(node.Value);
        }
    }
}