Read simple xml

XmlDocument doc = new XmlDocument();
// Load the XML to be read
doc.Load(@"F:\Books.xml");
// Get the root node
XmlElement books = doc.DocumentElement;
// Get the set of nodes returned by the child node
XmlNodeList xnl = books.ChildNodes;
foreach (XmlNode item in xnl)
{
    XmlElement xe = (XmlElement)item;
    Console.WriteLine(xe.GetAttribute("id"));
    
    XmlNodeList nodeList = xe.ChildNodes;
    foreach (XmlNode item2 in nodeList)
    {
        Console.WriteLine(item2.InnerText);
    }
}
Console.ReadKey();

　　

Edit content

XmlDocument doc = new XmlDocument();
doc.Load(@"F:\Books.xml");
XmlNodeList nodeList = doc.SelectSingleNode ( " / Books / Book [@ id = '3d310e87-6c46-4874-859e-c09f3acce589'] " ) .ChildNodes;
 foreach (XmlNode xn in nodeList) // Traverse all child nodes 
{
    XmlElement xe = (XmlElement) xn; // Convert the child node type to XmlElement type
     // Console.WriteLine (xe.GetAttribute ("id")); 
    if (xe.Name == " Price " )
    {
        Console.WriteLine(xe.InnerText);
        xe.InnerText = "oooooooo";
    }
}
doc.Save(@"F:\Books.xml");

Modify attributes

// Change the value of the attribute 
XmlDocument doc = new XmlDocument ();
doc.Load("Order.xml");
XmlNode xn = doc.SelectSingleNode("/Order/Items/OrderItem[@Name='190']");
xn.Attributes["Count"].Value = "200";
xn.Attributes["Name"].Value = "颜世伟";
doc.Save("Order.xml");
Console.WriteLine ( " Save successfully " );