XML 反序列化为类

Question

我正在尝试将 XDocument 反序列化为一个类。 我将 USPS 称为 CityStateLookupResponse API。 每次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; }
}

下面是我用来调用 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

Answer 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 。 它包含一个ZipCode节点列表，它是对应于您当前CityStateLookUpResponse类的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; }
}