如何使用asp.net序列化对值为xml的节点和属性进行反序列化 [英] how to deserialize an xml node with a value and an attribute using asp.net serialization

问题描述

我有4个小类，用于反序列化xml从一个传入的xml轮询，到可用的类建立轮询。

现在，我知道如何设置属性从一个类，匹配xml中的某个属性或元素，如果该元素只是一个容易
的字符串，但如果该元素也有一个属性，如下面的例子？

 <问题> 
< Question id =a guid> 
< AnswerItems> 
< AnswerItem Id =a guid> 3< / AnswerItem> 
< AnswerItem Id =a guid> 2< / AnswerItem> 
< AnswerItem Id =a guid> 5< / AnswerItem> 
< / AnswerItems> 
< / Question> 
< / Questions> 
  

问题类应如下所示：

  [Serializable（）] 
 public class Question 
 {
 [XmlAttribute（Id）] 
 public Guid QuestionId {get;组; } 
 
 [XmlArray（AnswersItems）] 
 [XmlArrayItem（AnswerItem，typeof（AnswerItem））] 
 public AnswerItem [] AnswerItems {get;组; } 
} 
 
 [Serializable（）] 
 public class AnswerItem 
 {
 [XmlAttribute（Id）] 
 public Guid QuestionId {get;组; } 
 
 //如何获取此节点的值？ 
 //它不是XmlElement，它不是XmlValue 
} 
  

Ok ，因此一个AnswerItem节点的值，这也是我想要得到的。
i可以很容易地不使用AnswerItem类，只是使用类型String的XmlArray AnswerItems，并将值放在数组中，但是我将失去AnswerItem的Id属性。

在 AnswerItem 中，创建一个名为 Value 的属性使用 XmlText 属性标记它。此设置将使 XmlSerializer 将 AnswerItem 元素中的文本读入 Value 。

  [Serializable（）] 
 public class AnswerItem 
 {
 [XmlAttribute（Id）] 
 public Guid QuestionId {get;组; } 
 
 [XmlText] 
 public string Value {get;组; } 
} 
  

I have 4 small classes to deserialize xml from an incomming xml poll, to usable classes to build up the poll.

now, i know how to set a property from a class, to match a certain attribute or element in the xml, and if that element is just a string thats easy but what if the element also has an attribute like in the following example?

<Questions>
 <Question id="a guid">
  <AnswerItems>
   <AnswerItem Id="a guid">3</AnswerItem>
   <AnswerItem Id="a guid">2</AnswerItem>
   <AnswerItem Id="a guid">5</AnswerItem>
  </AnswerItems>
 </Question>
</Questions>

the question class would look like this:

[Serializable()]
public class Question
{
    [XmlAttribute("Id")]
    public Guid QuestionId { get; set; }

    [XmlArray("AnswerItems")]
    [XmlArrayItem("AnswerItem", typeof(AnswerItem))]
    public AnswerItem[] AnswerItems { get; set; }
}

[Serializable()]
public class AnswerItem
{
    [XmlAttribute("Id")]
    public Guid QuestionId { get; set; }

    // how do i fetch the value of this node? 
    // its not a XmlElement and it's not an XmlValue
}

Ok, so the value of an AnswerItem node, that is what i want to get as well. i could easily not use the AnswerItem class, and just use an XmlArray AnswerItems of the type String and put the values in the array, but then i would lose the AnswerItem's Id Attribute.

解决方案

In AnswerItem, make a property called Value and mark it with the XmlText attribute. This setting will cause the XmlSerializer to read the text in the AnswerItem element into the Value property.

[Serializable()]
public class AnswerItem
{
    [XmlAttribute("Id")]
    public Guid QuestionId { get; set; }

    [XmlText]
    public string Value { get; set; }
}

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