[英]How to deserialize an XML array containing multiple types of elements in C#
I'm trying to deserialize the following file: 我正在尝试反序列化以下文件:
<league>
<players>
<skater>
<name>Wayne Stamkos</name>
<goals>23</goals>
<assists>34</assists>
</skater>
<skater>
<name>Sidney Lindros</name>
<goals>41</goals>
<assists>44</assists>
</skater>
<goalie>
<name>Martin Roy</name>
<wins>15</wins>
<losses>12</losses>
</goalie>
<skater>
<name>Paul Forsberg</name>
<goals>21</goals>
<assists>51</assists>
</skater>
<goalie>
<name>Roberto Rinne</name>
<wins>18</wins>
<losses>23</losses>
</goalie>
</players>
</league>
With the following code: 使用以下代码:
namespace ConsoleApplication2
{
[XmlRoot("league")]
public class League
{
[XmlArray("players")]
[XmlArrayItem("skater")]
public List<Skater> skaters { get; set; }
[XmlArrayItem("goalie")]
public List<Goalie> goalies { get; set; }
}
public class Skater
{
[XmlElement("name")]
public string Name;
[XmlElement("goals")]
public int Goals;
[XmlElement("assists")]
public int Assists;
}
public class Goalie
{
[XmlElement("name")]
public string Name;
[XmlElement("wins")]
public int Wins;
[XmlElement("losses")]
public int Losses;
}
class Program
{
static void Main(string[] args)
{
using (FileStream reader = new FileStream(@"C:\Temp\test.xml", FileMode.Open, FileAccess.Read))
{
var ser = new XmlSerializer(typeof(League));
League league = (League)ser.Deserialize(reader);
}
}
}
}
I'm expecting to get back a League object containing a Skaters list with 3 elements and a Goalies list with 2 elements. 我期待回到一个联盟对象,其中包含一个包含3个元素的Skaters列表和一个包含2个元素的守门员列表。 I do get the expected Skaters list but the Goalies list is empty.
我确实得到了预期的Skaters列表但是守门员列表是空的。 What am I doing wrong?
我究竟做错了什么?
There are two ways to do this; 有两种方法可以做到这一点; the first is to do something like:
首先是做一些事情:
[XmlArray("players")]
[XmlArrayItem("skater", Type=typeof(Skater))]
[XmlArrayItem("goalie", Type=typeof(Goalie))]
public List<SomeCommonBaseClass> Players { get; set; }
which maps the two element types inside a single collection. 它将两个元素类型映射到单个集合中。 Worst case,
SomeCommonBaseClass
could be object
: 最糟糕的情况是,
SomeCommonBaseClass
可能是object
:
[XmlArray("players")]
[XmlArrayItem("skater", Type=typeof(Skater))]
[XmlArrayItem("goalie", Type=typeof(Goalie))]
public List<object> Players { get; set; }
The second is to make <players>
map to a wrapper object: 第二个是使
<players>
映射到包装器对象:
[XmlElement("players")]
public Players Players { get;set;}
...
public class Players
{
[XmlElement("skater")]
public List<Skater> Skaters {get;set;}
[XmlElement("goalie")]
public List<Goalie> Goalies {get;set;}
}
Which to choose depends on the circumstance; 选择哪个取决于具体情况; the latter allows things like "at most one goalie", by changing it to:
后者允许“至多一个守门员”之类的东西,通过将其改为:
[XmlElement("goalie")]
public Goalie Goalie {get;set;}
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