Question

我遇到了C＃反序列化方法的问题，该方法用于从XML读取数据并将其放入List＆lt;＆gt;中。我有以下XML文件： events.xml

<ArrayOfEvent xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Event>
  <eventID>0</eventID>
  <type>Theatre</type>
  <title>City of gods</title>
  <price>100</price>
  <city>London</city>
  <place>Culture hall</place>
  <date>2014-12-18T20:00:00</date>
  <available_tickets>500</available_tickets>
  <reserved_tickets>0</reserved_tickets>
</Event>

<Event>
  <eventID>1</eventID>
  <type>Concert</type>
  <title>Jon Hopkins</title>
  <price>500</price>
  <city>Radbroke</city>
  <place>Arena</place>
  <date>2014-12-18T20:00:00</date>
  <available_tickets>200</available_tickets>
  <reserved_tickets>0</reserved_tickets>
</Event>
</ArrayOfEvent>

Event.cs

public class Event
    {
        public int eventID { get; set; }
        public String type { get; set; }
        public String title { get; set; }
        public double price { get; set; }
        public String city { get; set; }
        public String place { get; set; }
        public DateTime date { get; set; }
        public String description { get; set; }
        public int available_tickets { get; set; }
        public int reserved_tickets { get; set; }

        public Event(){}
        public Event(int ID, String typ, String titl, double pric, String cit, String plac, DateTime dat, String descriptio, int available_t, int reserved_t ){
            eventID = ID;
            type = typ;
            title = titl;
            price = pric;
            city = cit;
            place = plac;
            date = dat;
            description = descriptio;
            available_tickets = available_t;
            reserved_tickets = reserved_t;

        }

Database.cs

public List<Event> loadEvents() {
            List<Event> events = new List<Event>();
            XmlSerializer deserializer = new XmlSerializer(typeof(List<Event>));
            TextReader textReader = new StreamReader("events.xml");
            events = (List<Event>)deserializer.Deserialize(textReader);
            textReader.Close();
            return events;
        }

EventAdd.cs

Database data = new Database();

  public void testEvents(List<Event>){
    data.loadEvents();
    Console.WriteLine(events.Count.ToString()); 
  }

输出：0

问题是它打印0; 我甚至无法使用该readed列表执行任何操作，因为它是空的。请帮助我，我这个问题好几天了。

Answer 1

在您提供课程活动后，如果您有＃34;＆lt; / ArrayOfEvent＆gt;＆＃34;在你的xml中正确。

我使用以下代码在我的电脑上测试

string xml = "<ArrayOfEvent xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">" +
    @"<Event>
    <eventID>0</eventID>
    <type>Theatre</type>
    <title>City of gods</title>
    <price>100</price>
    <city>London</city>
    <place>Culture hall</place>
    <date>2014-12-18T20:00:00</date>
    <available_tickets>500</available_tickets>
    <reserved_tickets>0</reserved_tickets>
    </Event>
    </ArrayOfEvent>";

List<Event> events = new List<Event>();
XmlSerializer deserializer = new XmlSerializer(typeof(List<Event>));
TextReader textReader = new StringReader(xml);
events = (List<Event>)deserializer.Deserialize(textReader);
textReader.Close();
Console.WriteLine(events.Count);

代码与您的代码类似，但使用StringReader（）而不是从文件加载。

the output is 1.

所以问题应该是你的xml文件。可能在不正确的路径中，可能包含一些额外的字节，如BOM，也许是编码问题。你需要自己弄明白：）

Answer 2

根据MSDN样本， [XmlElement(Namespace = "")]将包括在每个班级成员之前。尝试将此添加到您的代码中。

来自MSDN的sample就是这个。

public class OrderedItem
{
    [XmlElement(Namespace = "http://www.cpandl.com")]
    public string ItemName;
    [XmlElement(Namespace = "http://www.cpandl.com")]
    public string Description;
    [XmlElement(Namespace = "http://www.cohowinery.com")]
    public decimal UnitPrice;
    [XmlElement(Namespace = "http://www.cpandl.com")]
    public int Quantity;
    [XmlElement(Namespace = "http://www.cohowinery.com")]
    public decimal LineTotal;
    // A custom method used to calculate price per item. 
    public void Calculate()
    {
        LineTotal = UnitPrice * Quantity;
    }
}

从XML文件读取数据并放入List。有什么问题？

2 个答案: