XmlSerializer按命名空间过滤

时间:2015-10-23 19:24:38

标签: c# xml-serialization xml-deserialization

我正在尝试对RSS 2.0 Feed进行反序列化,我想考虑一些iTunes扩展,但不必将它们直接烘焙到主类中。

使用C#中的XML反序列化器可能会出现以下内容吗?

public class RssChannel
{
    [XmlElement("title")]
    public string Title { get; set; }

    [XmlElement("link")]
    public string Link { get; set; }

    ....

    [XmlElement(Namespace = "itunes")]
    public iTunesExtensions iTunes { get; set; }
}

public class iTunesExtensions 
{
    [XmlElement("category")]
    public string[] Categories { get; set; }
}

我希望能解析类似的内容:

<channel>
    <itunes:category text="Society & Culture"/>
    <itunes:category text="Society & Culture"/>
    <itunes:category text="Society & Culture"/>
</channel>

是否有可能在更模块化的地方做这样的事情?还是我被困在主要课堂上?

1 个答案:

答案 0 :(得分:-1)

bizzehdee,

要将第一级设置为&#34;&#34;,您需要将其设置为班级的根和名称:

[XmlRoot("channel")]
public class channel

对于以下示例,我将其保留为RssChannel。

我假设您打算使用比iTunes更多的平台,因此iTunes仍然拥有自己的类。使用较少的代码执行此操作的方法是使用列表而不是数组:

public List<iTunes> iTunes;

类别将拥有自己的类,因此您可以在任何平台上使用类别。注意使用XmlAttribute。这将包括同一行中类别的名称:

public class iTunes 
{
    public List<Category> Categories { get; set; }
}

public class Category
{
    [XmlAttribute("category")]
    public string category { get; set; }
}

您可以使用静态类来帮助您序列化和反序列化数据。以下是静态类中的两个有用的方法:

// Save XML data.
public static void SaveData(ref RssChannel instance) {}

// Retrieve XML data.
public static RssChannel DeserializeData() {}

使用这些方法的最佳方法是首先使用DeserializeData()方法获取RssChannel的实例,如:

RssChannel foo = StaticClassName.DeserializeData();

对其进行更改,然后通过将其作为对SaveData()方法的引用进行保存来保存该实例,如:

SaveData(ref foo);

以下是一个完整的工作示例:

public static class XML
{
    // Serializes the passed instance of RssChannel into XML file, and saves to runtime memory.
    public static void SaveData(ref RssChannel instance)
    {
        // Objects:
        StreamWriter sw = new StreamWriter("yourXmlFile.xml");
        XmlSerializer serializer = new XmlSerializer(typeof(RssChannel));

        // Save data.
        serializer.Serialize(sw, instance);
        sw.Close();
    }

    // Deserializes data from the XML file, and returns the instance.
    public static RssChannel DeserializeData()
    {
        // Objects:
        RssChannel channelData = new RssChannel();
        XmlSerializer serializer = new XmlSerializer(typeof(RssChannel));
        List<iTunes> iTunesList = new List<iTunes>();

        if (File.Exists("yourXmlFile.xml"))
        {
            FileStream stream = new FileStream("yourXmlFile.xml", FileMode.Open);

            // Deserialize data.
            channelData = (RssChannel)serializer.Deserialize(stream);
            stream.Close();

            // Add data from deserialized iTunes list to list instance.
            if (channelData.iTunesList != null)
                iTunesList = channelData.iTunesList;
        }

        // Add data to RootData object lists.
        channelData.iTunesList = iTunesList;

        return channelData;
    }
}

[XmlRoot("RssChannel")]
public class RssChannel
{
    [XmlAttribute("Title")]
    public string Title; // { get; set; }

    [XmlAttribute("Link")]
    public string Link; // { get; set; }

    public List<iTunes> iTunesList; // { get; set; }
}

public class iTunes 
{
    public List<Category> Categories; // { get; set; }
}

public class Category
{
    [XmlAttribute("category")]
    public string category; // { get; set; }
}

您可以使用这样的类和静态方法:

private void AnyMethod()
{
    // To get an instance of your RssChannel class with all the data:
    RssChannel rssChannel = XML.DeserializeData();

    // Do anything with the data. Example below:
    iTunes newITunes = new iTunes();
    List<Category> categoryList = new List<Category>();

    Category newCategory1 = new Category(); // Create new categories.
    newCategory1.category = "Allegro";
    categoryList.Add(newCategory1);

    Category newCategory2 = new Category();
    newCategory2.category = "Prestissimo";
    categoryList.Add(newCategory2);

    newITunes.Categories = categoryList; // Add the categories to list.

    rssChannel.iTunesList.Add(newITunes); // Add that list to iTunes list.

    // Now, to save the data, pass a reference to the instance we just worked on:
    XML.SaveData(ref rssChannel);
}

这将产生一个看起来像的文件:

<?xml version="1.0" encoding="utf-8"?>
<RssChannel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <iTunesList>
    <iTunes>
      <Categories>
        <Category category="Allegro" />
        <Category category="Prestissimo" />
      </Categories>
    </iTunes>
  </iTunesList>
</RssChannel>