Question

我正在尝试将XML文件读入C＃对象。 XML包含多个子元素。使用下面的代码，我可以毫无问题地访问所有顶部字段（版本，实时，pageid等），但是当我尝试访问子节点值时，我收到了

Object reference not set to an instance of an object.

我假设它表明XMLSerializer不能将节点与我的对象匹配。我尝试过不同的对象类型，例如数组上的List字段，但似乎仍然得到相同的结果，所以我不确定最好的方法是什么？

非常感谢任何帮助我指明正确方向的帮助。

XML

<?xml version="1.0" encoding="utf-8"?>
  <LiveModelStruct xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <version>1</version>
   <live>true</live>
   <pageid>1</pageid>
   <data>test data</data>
   <giveawayactive>false</giveawayactive>
   <giveawayserial>00000000</giveawayserial>
   <templates>
     <template>
       <id>1</id>
       <title>Template 1</title>
       <type>Opener</type>
     </template>
     <template>
       <id>2</id>
       <title>Template 2</title>
       <type>Song</type>
     </template>
  </templates>
 </LiveModelStruct>

对象

[XmlRoot(ElementName = "LiveModelStruct")]
public class LiveModelStruct
{
    [XmlElement(ElementName = "version")]
    public string version { get; set; }
    [XmlElement(ElementName = "live")]
    public string live { get; set; }
    [XmlElement(ElementName = "pageid")]
    public string pageid { get; set; }
    [XmlElement(ElementName = "data")]
    public string data { get; set; }
    [XmlElement(ElementName = "giveawayactive")]
    public string giveawayactive { get; set; }
    [XmlElement(ElementName = "giveawayserial")]
    public string giveawayserial { get; set; }
    [XmlElement(ElementName = "templates")]
    public Templates Templates { get; set; }
    [XmlAttribute(AttributeName = "xsi", Namespace = "http://www.w3.org/2000/xmlns/")]
    public string Xsi { get; set; }
    [XmlAttribute(AttributeName = "xsd", Namespace = "http://www.w3.org/2000/xmlns/")]
    public string Xsd { get; set; } 
}

[XmlRoot(ElementName = "templates")]
public class Templates
{
    [XmlElement(ElementName = "template")]
    public Template[] Template { get; set; }    
}

[XmlRoot(ElementName = "template")]
public class Template
{
    [XmlElement(ElementName = "id")]
    public string id { get; set; }
    [XmlElement(ElementName = "title")]
    public string title { get; set; }
    [XmlElement(ElementName = "type")]
    public string type { get; set; }
}

代码

...
var serializer = new XmlSerializer(typeof(LiveModelStruct));
var data = (LiveModelStruct)serializer.Deserialize(stream);
var test1 = data.version;
Debug.WriteLine(test1); //Returns 1 as it should

var test = data.Templates.Template[0].title; //Throws Error
Debug.WriteLine(test);

Answer 1

使用LINQ to XML来解析XML。

Parse xml using LINQ to XML to class objects

XDocument doc = XDocument.Parse(xml);
var result = from c in doc.Descendants("LiveModelStruct")
             select new LiveModelStruct()
             {
                    version = (string)c.Element("version").Value,
                    live = (string)c.Element("live").Value
             };

C＃将XML解析为具有子元素的对象

1 个答案: