实体转Xml存储和遍历所有Xml节点

    public class Student
    {
        public string First { get; set; }
        public string Last { get; set; }
        public int ID { get; set; }
        public string Street { get; set; }
        public string City { get; set; }
        public List<int> Scores;
    }

            List<Student> students = new List<Student>() { 
                new Student {First="Svetlana", 
                    Last="Omelchenko",  
                    ID=111,  
                    Street="123 Main Street", 
                    City="Seattle", 
                    Scores= new List<int> {97, 92, 81, 60}}, 
                new Student {First="Claire", 
                    Last="O’Donnell",  
                    ID=112, 
                    Street="124 Main Street", 
                    City="Redmond", 
                    Scores= new List<int> {75, 84, 91, 39}}, 
                new Student {First="Sven", 
                    Last="Mortensen", 
                    ID=113, 
                    Street="125 Main Street", 
                    City="Lake City", 
                    Scores= new List<int> {88, 94, 65, 91}} 
            };

将此students对象转换为Xml文本：

            var studentsToXML = new XElement("root",
                from s in students
                let x = string.Format("{0},{1},{2},{3}", s.Scores[0], s.Scores[1], s.Scores[2], s.Scores[3])
                select new XElement("student",
                    new XElement("First", s.First),
                    new XElement("Street", s.Street),
                    new XElement("City", s.City)
                )
            );

得到如下Xml文本：

<root>
  <student>
    <First>Svetlana</First>
    <Street>123 Main Street</Street>
    <City>Seattle</City>
  </student>
  <student>
    <First>Claire</First>
    <Street>124 Main Street</Street>
    <City>Redmond</City>
  </student>
  <student>
    <First>Sven</First>
    <Street>125 Main Street</Street>
    <City>Lake City</City>
  </student>
</root>

存入磁盘指定位置：

            using (FileStream fs = new FileStream(@"D:\X.XML", FileMode.OpenOrCreate, FileAccess.ReadWrite))
            {
                byte[] Buf = Encoding.Default.GetBytes(studentsToXML.ToString());
                fs.Write(Buf, 0, Buf.Length);
            }

遍历所有节点，找到指定节点的值：

        static void FindElement(XmlNodeList _Nodes, string _CompareValue)
        {
            /*********** 第一种方法 ***********/
            //foreach (XmlNode item in _Nodes)
            //{
            //    if (item.Name == _CompareValue)
            //        Console.WriteLine("\r" + _CompareValue+"\r"+item.InnerText);
            //    else
            //        FindElement(item.ChildNodes, _CompareValue);
            //}

            /*********** 第二种方法 ***********/
            _Nodes.Cast<XmlNode>().ToList<XmlNode>().ForEach(p =>
            {
                if (p.Name == _CompareValue)
                {
                    Console.WriteLine();
                    Console.WriteLine("\t" + p.Name + "" + p.InnerText);
                }
                else
                {
                    FindElement(p.ChildNodes, _CompareValue);
                }
            });
        }

调用：

            System.Xml.XmlDocument xd = new System.Xml.XmlDocument();
            xd.Load(@"D:\X.XML");
            FindElement(xd.ChildNodes as XmlNodeList, "City");