LinqToXML学习

  //读取XML文档并返回对象列表
        static IEnumerable<Customer> CreateCustomers()
        {
            var results = from c in XDocument.Load("Customers.xml").
                              Descendants("Customer")
                          select new Customer
                          {
                              City = c.Attribute("City").Value,
                              CustomerID = c.Attribute("CustomerID").Value
                          };
            return results;
        }
        //显示XML文档里的内容
        public static void XMLQuery()
        {
            var doc = XDocument.Load("Customers.xml");
            Console.WriteLine(doc);
        }

        //查询XML並轉換
        public static void XMLSearch()
        {
            //查詢顯示
            var doc = XDocument.Load("Customers.xml");
            var results = from c in doc.Descendants("Customer2") where c.Attribute("City").Value == "London2" select c;
            foreach (var item in results)
            {
                Console.WriteLine(item + "\n");
            }
            XElement transformedResulets = new XElement("Contacts", from customer in results
                                                                  select new XElement("Contact",
                                                                  new XAttribute("ID", customer.Attribute("CustomerID").Value),
                                                                  new XElement("Name", customer.Attribute("ContactName").Value),
                                                                  new XElement("City", customer.Attribute("City").Value)));
            Console.WriteLine("Results:\n{0}", transformedResulets);
            //將轉換的XML保存到新的XML中
            transformedResulets.Save("Output.xml");
        }
    }

    //实体对象
    public class Customer
    {
        public string CustomerID { get; set; }
        public string City { get; set; }
        public override string ToString()
        {

            return CustomerID + "\t" + City;
        }
    }