c# - 用于 XML 的 Linq 查询

Question

我有一个如下的 XML

<Employees>
    <Employee>
        <ID>1</ID>
        <Address>
          <City>Bangalore</City>
          <CreatedOn>1-1-2012</CreatedOn>
        </Address>
        <Address>
          <City>Pune</City>
          <CreatedOn>1-10-2012</CreatedOn>
        </Address>
    </Employee>
    <Employee>
        <ID>2</ID>
        <Address>
          <City>Hyd</City>
          <CreatedOn>1-1-2009</CreatedOn>
        </Address>
        <Address>
          <City>Bombay</City>
          <CreatedOn>1-1-2010</CreatedOn>
        </Address>
    </Employee>
</Employees>

我想在 C# 中有一个 linq 查询来检索具有最新创建日期的地址节点的员工记录。

你能帮我写一下Linq Query吗？

在此先感谢您的帮助

Answer 1

string xml="<Employees><Employee><ID>1</ID><Address><City>Bangalore</City><CreatedOn>1-1-2012</CreatedOn></Address><Address><City>Pune</City><CreatedOn>1-10-2012</CreatedOn></Address></Employee><Employee><ID>2</ID><Address><City>Hyd</City><CreatedOn>1-1-2009</CreatedOn></Address><Address><City>Bombay</City><CreatedOn>1-1-2010</CreatedOn></Address></Employee></Employees>";

XElement xe = XElement.Parse(xml);

var query = xe
.Elements("Employee")
.Select
(
    x=> new 
    {
        Addresses = x.Elements("Address")
        .Select
        (
            z=>new 
            {
                ID = x.Element("ID").Value,
                City = z.Element("City").Value,
                CreatedOn = z.Element("CreatedOn").Value
            }
        ).ToList()
    }
)
.SelectMany (X=>X.Addresses);

var record = query.Where (q => DateTime.Parse(q.CreatedOn)==query.Max (x => DateTime.Parse(x.CreatedOn))).SingleOrDefault ();

Console.WriteLine("{0},{1},{2}",record.ID,record.City,record.CreatedOn);