使用xpath web api c#从xml获取数据

Question

我开始说我正在使用 C# 和 .net core 5 开发异步 Web api 应用程序。

此应用程序需要读取一个 XML 文件，给出“ok”响应（异步模式），然后将值返回给我，以便将它们插入数据库。

我写了一个这样的算法来读取节点列表，但我不知道为什么它不能正确地遍历 nodeList...

public class LetturaXml
{
    public List<InsertClassDTO> xmlToList(InputDTO input)
    {
        List<InsertClassDTO> list = new List<AnnuncioAutoDTO>();

        XmlDocument doc = new XmlDocument();
        doc.Load(input.filePath);

        XmlNodeList nodeList = doc.SelectNodes("//ITEM[@CATEGORYID=10]");

        foreach (XmlNode item in nodeList)
        {
            //.... tranfert into DTO, then into list, and finally insert into DB for every iteration
        }
    }
}

感谢大家的帮助！

附言

xml 示例：

<ITEM ID="5331" CITYID="7" CATEGORYID="10" LASTUPDATE="2021-05-14" EXPIRED="0">
      <ISTAT>000</ISTAT>
      <TITLE><![CDATA[title]]></TITLE>
      <TEXT>
           <![CDATA[text]]>
      </TEXT>
      <EMAIL>@hotmail.it</EMAIL>
      <ATTRIBUTELIST>
      <ATTRIBUTE>
          <ATTRID>prezzo</ATTRID>
          <ATTRNAME></ATTRNAME>
          <ATTRVAL><![CDATA[3400]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
          <ATTRID>telagenzia</ATTRID>
          <ATTRNAME></ATTRNAME>
          <ATTRVAL><![CDATA[33333333333]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
          <ATTRID>contattotelefonico</ATTRID>
          <ATTRNAME></ATTRNAME>
          <ATTRVAL><![CDATA[33333333333]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
          <ATTRID>2</ATTRID>
          <ATTRNAME><![CDATA[example]]></ATTRNAME>
          <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>4</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>indirizzoagenzia</ATTRID>
        <ATTRNAME></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>comuneagenzia</ATTRID>
        <ATTRNAME></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>capagenzia</ATTRID>
        <ATTRNAME></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>inserzionistaauto</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>tipocomprovendo</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>inserzionistaauto</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>marca</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>modello</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>condizioneveicolo</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>km</ATTRID>
        <ATTRNAME></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>immatricolazione</ATTRID>
        <ATTRNAME></ATTRNAME>
        <ATTRVAL><![CDATA[example]]></ATTRVAL>
      </ATTRIBUTE>
      <ATTRIBUTE>
        <ATTRID>alimentazione</ATTRID>
        <ATTRNAME><![CDATA[example]]></ATTRNAME>
        <ATTRVAL></ATTRVAL>
      </ATTRIBUTE>
      </ATTRIBUTELIST>
      <IMAGELIST>
          <IMGFILE><![CDATA[exampleLink.jpg]]></IMGFILE>
      </IMAGELIST>
  </ITEM>

Answer 1

希望这足以成为您结束的起点：

var xml = @"
<ITEM ID=""5331"" CITYID=""7"" CATEGORYID=""10"" LASTUPDATE=""2021-05-14"" EXPIRED=""0"">
        <ISTAT>000</ISTAT>
        <TITLE><![CDATA[title]]></TITLE>
        <TEXT>
            <![CDATA[text]]>
        </TEXT>
        <EMAIL>@hotmail.it</EMAIL>
        <ATTRIBUTELIST>
        <ATTRIBUTE>
            <ATTRID>prezzo</ATTRID>
            <ATTRNAME></ATTRNAME>
            <ATTRVAL><![CDATA[3400]]></ATTRVAL>
        </ATTRIBUTE>
        <ATTRIBUTE>
            <ATTRID>telagenzia</ATTRID>
            <ATTRNAME></ATTRNAME>
            <ATTRVAL><![CDATA[33333333333]]></ATTRVAL>
        </ATTRIBUTE>
        <ATTRIBUTE>
            <ATTRID>contattotelefonico</ATTRID>
            <ATTRNAME></ATTRNAME>
            <ATTRVAL><![CDATA[33333333333]]></ATTRVAL>
        </ATTRIBUTE>
        <ATTRIBUTE>
            <ATTRID>2</ATTRID>
            <ATTRNAME><![CDATA[example]]></ATTRNAME>
            <ATTRVAL><![CDATA[example]]></ATTRVAL>
        </ATTRIBUTE>
        </ATTRIBUTELIST>
        <IMAGELIST>
            <IMGFILE><![CDATA[exampleLink.jpg]]></IMGFILE>
        </IMAGELIST>
    </ITEM>";

var list = new List<InsertClassDTO>();

XmlDocument doc = new XmlDocument();
doc.LoadXml(xml); // LoadXml() is used to load XML from a string. Use Load() to load XML from a file path)

XmlNodeList nodeList = doc.SelectNodes("//ITEM[@CATEGORYID=10]");

foreach (XmlNode item in nodeList)
{
    //.... tranfert into DTO, then into list, and finally insert into DB for every iteration
    var attirbutes = new List<Attirbute>();

    foreach (XmlNode x in item["ATTRIBUTELIST"].SelectNodes("ATTRIBUTE/ATTRID[text() = 'prezzo'] | ATTRIBUTE/ATTRID[text() = 'telagenzia']"))
    {
        attirbutes.Add(new Attirbute()
        {
            Id = x.ParentNode["ATTRID"].InnerText,
            Value = x.ParentNode["ATTRVAL"].InnerText,
        });
    }

    list.Add(new InsertClassDTO()
    {
        Email = item["EMAIL"].InnerText,
        Attributes = attirbutes
    });
}

您还需要一些模型：

public class InsertClassDTO
{
    public string Email { get; set; }
    public List<Attirbute> Attributes { get; set; }


}
public class Attirbute
{
    public string Id { get; set; }
    public string Value { get; set; }
}