在转换为 xml 之前从 json 中删除“false”

Question

我正在将 JSON 文件从 jsonrpc 转换为 XML。

但是当字段未填写时，API 会给出带有

false

值的字段，例如街道2

{
    "jsonrpc": "2.0",
    "id": null,
    "code": 200,
    "result": [
        {
            "id": 32,
            "name": "Somebody",
            "street": "21 golfcountry",
            "street2": false,
            "city": "Amsterdam"
        },
        {
            "id": 38,
            "name": "Somebody else",
            "street": "27 golfcountry",
            "street2": "sub lane 21",
            "city": "Amsterdam"
        }
    ]
}

因此 XML 解析为

<street2>false</street2>

和

<street2>sub lane 21</street2>

我想在转换之前删除那些错误字段。 我怎样才能删除这些错误值

XmlDocument doc = JsonConvert.DeserializeXmlNode(json);

Answer 1

这是一个使用 XSLT 删除不需要的 XML 元素作为后处理步骤的解决方案。

它使用所谓的 Identity Transform XSLT 模式。

输入XML

<root>
    <jsonrpc>2.0</jsonrpc>
    <code>200</code>
    <result>
        <id>32</id>
        <name>Somebody</name>
        <street2>false</street2>
        <city>Amsterdam</city>
    </result>
        <result>
        <id>38</id>
        <name>Somebody else</name>
        <street2>sub lane 21</street2>
        <city>Amsterdam</city>
    </result>
</root>

XSLT 1.0

<?xml version='1.0'?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="xml" omit-xml-declaration="yes"
               encoding="UTF-8" indent="yes"/>
   <xsl:strip-space elements="*"/>

   <!--Identity transform-->
   <xsl:template match="@*|node()">
      <xsl:copy>
         <xsl:apply-templates select="@*|node()"/>
      </xsl:copy>
   </xsl:template>

   <xsl:template match="*[text()='false']" />
</xsl:stylesheet>

输出XML

<root>
  <jsonrpc>2.0</jsonrpc>
  <code>200</code>
  <result>
    <id>32</id>
    <name>Somebody</name>
    <city>Amsterdam</city>
  </result>
  <result>
    <id>38</id>
    <name>Somebody else</name>
    <street2>sub lane 21</street2>
    <city>Amsterdam</city>
  </result>
</root>

c#

void Main()
{
   const string SOURCEXMLFILE = @"e:\Temp\input.xml";
   const string XSLTFILE = @"e:\Temp\process.xslt";
   const string OUTPUTXMLFILE = @"e:\temp\output.xml";

   try
   {
      XsltArgumentList xslArg = new XsltArgumentList();

      using (XmlReader src = XmlReader.Create(SOURCEXMLFILE))
      {
         XslCompiledTransform xslt = new XslCompiledTransform();
         xslt.Load(XSLTFILE, new XsltSettings(true, true), new XmlUrlResolver());

         XmlWriterSettings settings = xslt.OutputSettings.Clone();
         settings.IndentChars = "\t";
         // to remove BOM
         settings.Encoding = new UTF8Encoding(false);

         using (XmlWriter result = XmlWriter.Create(OUTPUTXMLFILE, settings))
         {
            xslt.Transform(src, xslArg, result, new XmlUrlResolver());
            result.Close();
         }
      }
      Console.WriteLine("File '{0}' has been generated.", OUTPUTXMLFILE);
   }
   catch (Exception ex)
   {
      Console.WriteLine(ex.Message);
   }
}