c# - XmlSerializer 反序列化返回空数组

Question

我正在尝试反序列化以下 XML(摘录):

<NSArray> 
  <Song id="23507" type="Song"> 
    <title>Waking The Demon</title> 
    <artist id="17" type="Artist"> 
      <nameWithoutThePrefix>Bullet For My Valentine</nameWithoutThePrefix> 
      <useThePrefix>false</useThePrefix> 
      <name>Bullet For My Valentine</name> 
    </artist> 
  </Song> 
  <Song id="3663" type="Song"> 
    <title>Hand Of Blood</title> 
    <artist id="17" type="Artist"/> 
  </Song> 
  <Song id="59226" type="Song"> 
    <title>Your Betrayal</title> 
    <artist id="17" type="Artist"/> 
  </Song> 
</NSArray> 

具有以下类:

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
[XmlRoot(ElementName = "NSArray", Namespace = "", IsNullable = false)]
public class SearchResult
{
    [XmlElement("Song", Form = XmlSchemaForm.Unqualified)]
    public Song[] Items { get; set; }
}

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
[XmlRoot(Namespace = "", IsNullable = false)]
public class Song
{
    [XmlElement(Form = XmlSchemaForm.Unqualified)]
    public string Title { get; set; }

    [XmlElement("artist", Form = XmlSchemaForm.Unqualified)]
    public Artist Artist { get; set; }

    [XmlAttribute]
    public string Type { get; set; }

    [XmlAttribute]
    public string Id { get; set; }
}

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
public class Artist
{
    [XmlElement(Form = XmlSchemaForm.Unqualified)]
    public string NameWithoutThePrefix { get; set; }

    [XmlElement(Form = XmlSchemaForm.Unqualified)]
    public string UseThePrefix { get; set; }

    [XmlElement(Form = XmlSchemaForm.Unqualified)]
    public string Name { get; set; }

    [XmlAttribute]
    public string Type { get; set; }

    [XmlAttribute]
    public string Id { get; set; }
}

和下面的代码:

    var request = WebRequest.Create(string.Format("http://myurl.com");
    request.BeginGetResponse(GetEventResponseCallback, request);

    private void GetEventResponseCallback(IAsyncResult result)
    {
        var request = (HttpWebRequest)result.AsyncState;
        var response = request.EndGetResponse(result);

        if (response.GetResponseStream() == null) return;
        using (var stream = response.GetResponseStream())
        {
            _xmlReader = XmlReader.Create(stream);
            var songs = _xmlSerializer.Deserialize(_xmlReader) as SearchResult;
        }
    }

但是，在 var songs = _xmlSerializer.Deserialize(_xmlReader) as SearchResult; 上，反序列化执行成功，但 songs 变量不包含任何数据。如果我使用调试器进行检查，它会为数组中的所有值返回 Could not evaluate expression。

有什么提示吗？谢谢。

Answer 1

您的 SearchResult 类需要一些修复。您真的很接近，代码只缺少一些元素名称和可序列化的属性。

这是一个有效的类:

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
[XmlRoot(ElementName = "NSArray", Namespace = "", IsNullable = false)]
[Serializable]
public class SearchResult
{
    [XmlElement("Song", Form = XmlSchemaForm.Unqualified)]
    public Song[] Items { get; set; }
}

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
[XmlRoot(ElementName="Song", Namespace = "", IsNullable = false)]
[Serializable]
public class Song
{
    [XmlElement("title", Form = XmlSchemaForm.Unqualified)]
    public string Title { get; set; }

    [XmlElement("artist", Form = XmlSchemaForm.Unqualified)]
    public Artist Artist { get; set; }

    [XmlAttribute("type")]
    public string Type { get; set; }

    [XmlAttribute("id")]
    public string Id { get; set; }
}

[GeneratedCode("xsd", "4.0.30319.1")]
[DebuggerStepThrough]
[XmlType(AnonymousType = true)]
[Serializable]
public class Artist
{
    [XmlElement("nameWithoutThePrefix", Form = XmlSchemaForm.Unqualified)]
    public string NameWithoutThePrefix { get; set; }

    [XmlElement("useThePrefix", Form = XmlSchemaForm.Unqualified)]
    public string UseThePrefix { get; set; }

    [XmlElement("name", Form = XmlSchemaForm.Unqualified)]
    public string Name { get; set; }

    [XmlAttribute("type")]
    public string Type { get; set; }

    [XmlAttribute("id")]
    public string Id { get; set; }
}