通过走进树反序列化 XML：有一个错误反映类型

Question

我有这个 XML 作为 API 的结果。使用 DotNetXmlDeserializer 作为反序列化器。

<results>
   <result inum=\"802469000014312\">
      <field name=\"startedat\">2019-09-04T15:59:56.372</field>
      <field name=\"duration\">8</field>
      <field name=\"otherparties\">1043 (DEMO BLA BLA), 0519331839</field>
      <field name=\"switchcallid\">00001000081567605580</field>
      <field name=\"udfs\"></field>
   </result>
   <result inum=\"802469000014313\">
      <field name=\"startedat\">2019-09-04T16:00:31.414</field>
      <field name=\"duration\">6</field>
      <field name=\"otherparties\">1043 (DEMO BLA BLA), 0519331839</field>
      <field name=\"switchcallid\">00001000091567605608</field>
      <field name=\"udfs\"></field>
   </result>

我正在使用这些类进行反序列化

[XmlRoot("results")]
public class WFOQueryDTO_List
{
    public WFOQueryDTO_List() { Items = new List<WFOQueryDTO_Out>(); }
    [XmlElement("result")]
    public List<WFOQueryDTO_Out> Items { get; set; }
}

public class WFOQueryDTO_Out
{
    [XmlElement("field")]
    [XmlAttribute("startedat")]
    public DateTime startedat { get; set; }

    [XmlElement("field")]
    [XmlElement("duration")]
    public int duration { get; set; }


    [XmlElement("field")]
    [XmlElement("otherparties")]
    public string otherparties { get; set; }

    [XmlElement("field")]
    [XmlElement("switchcallid")]
    public string switchcallid { get; set; }

    [XmlElement("field")]
    [XmlElement("udfs")]
    public string udfs { get; set; }

}

但我明白了：

 System.InvalidOperationException: There was an error reflecting type ...For non-array types, you may use the following attributes: XmlAttribute, XmlText, XmlElement, or XmlAnyElement.

Answer 1

基本上，XmlSerializer 不直接支持该形状。您需要分两步完成：

1. 使用原始字段列表反序列化
2. 通过手动识别每个字段名称，将原始字段映射到 WFOQueryDTO_Out 的实际字段，为每个命名字段应用所需的任何类型解析逻辑

“原始字段列表”是指：

[XmlElement("field")]
public List<Field> Fields {get;} = new List<Field>();

public class Field {
    [XmlAttribute("name")]
    public string Name {get;set;}

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

---

要做到这一点正确（并且很容易），您需要输入更典型的强定义形式的 xml：

<startedat>2019-09-04T15:59:56.372</startedat>
<duration>8</duration>
<otherparties>1043 (DEMO BLA BLA), 0519331839</otherparties>
<switchcallid>00001000081567605580</switchcallid>
<udfs></udfs>

Answer 2

这里是完整的解决方案

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.IO;

namespace ConsoleApplication128
{
    class Program
    {
        static void Main(string[] args)
        {
            string xml =
                "<root>" +
                   "<results>" +
                      "<result inum=\"802469000014312\">" +
                         "<field name=\"startedat\">2019-09-04T15:59:56.372</field>" +
                         "<field name=\"duration\">8</field>" +
                         "<field name=\"otherparties\">1043 (DEMO BLA BLA), 0519331839</field>" +
                         "<field name=\"switchcallid\">00001000081567605580</field>" +
                         "<field name=\"udfs\"></field>" +
                      "</result>" +
                      "<result inum=\"802469000014313\">" +
                         "<field name=\"startedat\">2019-09-04T16:00:31.414</field>" +
                         "<field name=\"duration\">6</field>" +
                         "<field name=\"otherparties\">1043 (DEMO BLA BLA), 0519331839</field>" +
                         "<field name=\"switchcallid\">00001000091567605608</field>" +
                         "<field name=\"udfs\"></field>" +
                      "</result>" +
                   "</results>" +
                "</root>";
            StringReader sReader = new StringReader(xml);
            XmlReader xReader = XmlReader.Create(sReader);
            XmlSerializer serializer = new XmlSerializer(typeof(Root));
            Root root = (Root)serializer.Deserialize(xReader);

        }
    }
    [XmlRoot("root")]
    public class Root
    {
        [XmlArray("results")]
        [XmlArrayItem("result")]
        public WFOQueryDTO_Out[] WFOQueryDTO_Out { get; set; } 
    }
    public class WFOQueryDTO_Out
    {
        private DateTime startedat { get; set; }
        private int duration { get; set; }
        private string otherparties { get; set; }
        private string switchcallid { get; set; }
        private string udfs { get; set; }

        [XmlElement("field")]
        public Field[] field
        {
            get { return new Field[1]; }
            set
            {
                foreach(Field _field in value)
                {
                    switch (_field.name)
                    {
                        case "startedat":
                            startedat = DateTime.Parse(_field.value);
                            break;
                        case "duration":
                            duration = int.Parse(_field.value);
                            break;
                        case "otherparties" :
                            otherparties = _field.value;
                            break;
                        case "switchcallid" :
                            switchcallid = _field.value;
                            break;
                        case " udfs" :
                            udfs = _field.value;
                            break;
                    }
                }
            }
        }

    }
    public class Field
    {

        [XmlAttribute("name")]
        public string name { get; set; }
        [XmlText]
        public string value { get; set; }
    }

}