在读取XML文档时如何使用XComment？

using System.Xml.Linq;

XElement root = new XElement("Root");
XComment comment = new XComment("This is a comment");
root.Add(comment);

root.Save("file.xml");

XElement root = XElement.Load("file.xml");
foreach (XNode node in root.Nodes())
{
    if (node is XComment)
    {
        XComment comment = (XComment)node;
        Console.WriteLine(comment.Value);
    }
}