XML 反序列化为类

Posted 2023-02-24

【中文标题】XML 反序列化为类

【英文标题】：XML Deserialize to class

【发布时间】：2021-12-12 04:47:55

【问题描述】：

我正在尝试将 XDocument 反序列化为一个类。我正在调用 USPS CityStateLookupResponse API。每次我反序列化为我的类对象时，该对象始终为空。

这是我的课

[Serializable()]
[XmlRoot("CityStateLookupResponse", IsNullable = false)]
public class CityStateLookUpResponse

    [XmlAttribute("ID")]
    public string Id  get; set; 

    [XmlElement("City")]
    public string City  get; set; 

    [XmlElement("State")]
    public string State  get; set; 

    [XmlElement("Zip5")]
    public string Zip  get; set; 

以下是我用来拨打 USPS 的代码

 XDocument requestDoc = new XDocument(
   new XElement("CityStateLookupRequest",
   new XAttribute("USERID", _postOfficeOptions.UserId),
   new XElement("Revision", "1"),
   new XElement("ZipCode",
     new XAttribute("ID", "0"),
     new XElement("Zip5", zipCode.ToString())
      )
     )
   );
    
try

   var url = _postOfficeOptions.Url + requestDoc;
   var client = new WebClient();
   var response = client.DownloadString(url);
    
   var xdoc = XDocument.Parse(response.ToString());
    
   XmlSerializer serializer = new XmlSerializer(typeof(CityStateLookUpResponse));
    
   if (!xdoc.Descendants("ZipCode").Any()) return null;
    
   return (CityStateLookUpResponse)serializer.Deserialize(xdoc.CreateReader());
                       

catch (Exception ex)

   throw new Exception("In CityStateLookUp:", ex);

这行代码总是返回null

return (CityStateLookUpResponse)serializer.Deserialize(xdoc.CreateReader());

这是来自 USPS API 的有效响应

<?xml version="1.0"?>
<CityStateLookupResponse><ZipCode ID="0"><Zip5>90210</Zip5>
<City>BEVERLY HILLS</City><State>CA</State></ZipCode>
</CityStateLookupResponse>

任何帮助将不胜感激

【参考方案1】：

问题是您试图从错误的节点开始反序列化。您的响应的根节点是CityStateLookupResponse。其中包含ZipCode 节点列表，它是与您当前的CityStateLookUpResponse 类对应的ZipCode 节点。

您可以通过像这样更改响应类来解决此问题：

[Serializable()]
[XmlRoot("CityStateLookupResponse", IsNullable = false)]
public class CityStateLookupResponse

    [XmlElement("ZipCode")]
    public List<ZipCode> ZipCode  get;  = new();


[Serializable()]
[XmlRoot("ZipCode", IsNullable = false)]
public class ZipCode

    [XmlAttribute("ID")]
    public string Id  get; set; 

    [XmlElement("City")]
    public string City  get; set; 

    [XmlElement("State")]
    public string State  get; set; 

    [XmlElement("Zip5")]
    public string Zip  get; set; 

【讨论】：

谢谢！我很感激帮助。这解决了我的问题:-)