通过 linq 到 xml 的复杂类型映射答案

【问题标题】：Complex type mapping via linq to xml通过 linq 到 xml 的复杂类型映射
【发布时间】：2013-08-14 21:20:02
【问题描述】：

我在 XML 文件中有一个联系人列表。
每个联系人都有一些属性和mdpr:connection。
连接是单独的对象。
我阅读了这个列表并将所有联系人都添加到一个具有标准属性的列表中，但是如何将此连接映射到对象。

<?xml version="1.0" encoding="UTF-8"?>
<mdpr:Data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mdpr="http://...">
<mdpr:contactList>
    <mdpr:contact ID="{123456}" classID="Customer">
      <mdpr:Name>data1</mdpr:Name>
      <mdpr:TransportCode>data2</mdpr:TransportCode>
      <mdpr:connection connectionIndex="0" fromID="{12345}" toID="{123456}">
        <mdpr:status>1-5</mdpr:status>
        <mdpr:startDate>2012-03-13T10:23:00Z</mdpr:startDate>
        <mdpr:endDate>2013-03-13T13:44:00Z</mdpr:endDate>        
      </mdpr:connection>
    </mdpr:contact>
</mdpr:contactList>
...
Classes:
public class Contact
    {
        public string Name { get; set; }
        public string TransportCode { get; set; }
        public Connection Connection { get; set; }

        public TransportPlan()
        {
            this.Connection = new Connection();
        }
    }
public class Connection
    { 
        public string status{ get; set; }
        public string startDate{ get; set; }
        public string endDate { get; set; }
    }

读取数据的代码：

XNamespace mdpr = "http://...";
var contacts = from c in xdoc.Root.Element(mdpr + "contactList")
                                  .Elements(mdpr + "contact")
               select new Contact {
                   TransportCode = (string)c.Element(mdpr + "TransportCode"),
                   Name = (string)c.Element(mdpr + "Name")
               };

那么问题是如何阅读mdpr:connection？

【问题讨论】：

标签： c# xml xml-parsing linq-to-xml xmldocument

【解决方案1】：

您可以通过添加另一个“.Element”来直接访问这些元素。我添加了一个变量以提高可读性。

var contacts = from c in xdoc.Element(mdpr + "Data")
                             .Element(mdpr + "contactList")
                             .Elements(mdpr + "contact")
               let contact = c
               let connection = contact.Element(mdpr + "connection")
               select new Contact
               {
                   TransportCode = (string)contact.Element(mdpr + "TransportCode"),
                   Name = (string)contact.Element(mdpr + "Name"),
                   Connection = new Connection
                   {
                       status = (string)connection.Element(mdpr + "status"),
                       startDate = (string) connection.Element(mdpr + "startDate"),
                       endDate = (string)connection.Element(mdpr + "endDate"),
                   },
               };

如果你想允许多个连接（为了让场景更复杂）

public class Contact
{
    public string Name { get; set; }
    public string TransportCode { get; set; }
    public List<Connection> Connections { get; set; }
}

解析多个连接的代码

var contacts = from c in xdoc.Element(mdpr + "Data")
                             .Element(mdpr + "contactList")
                             .Elements(mdpr + "contact")
               let contact = c
               let connections = contact.Elements(mdpr + "connection")
               select new Contact
               {
                   TransportCode = (string)contact.Element(mdpr + "TransportCode"),
                   Name = (string)contact.Element(mdpr + "Name"),
                   Connections = connections.Select( connection => 
                       new Connection
                       {
                           status = (string)connection.Element(mdpr + "status"),
                           startDate = (string) connection.Element(mdpr + "startDate"),
                           endDate = (string)connection.Element(mdpr + "endDate"),
                       }).ToList(),
               };

【讨论】：