.net 当名称带有冒号时读取 xml 元素值

Question

我正在使用 VB.Net，想要从 xml 文件（它是来自 DarkTable 的 xmp 文件）读取特定值。我想阅读下面指示为“***此值***”的注释和标签值（如果存在）。

我通常可以摸索着读取 xml 值，但冒号和命名空间是一个额外的挑战。

如有任何帮助，我们将不胜感激。谢谢你。

到目前为止我所拥有的是：

    Private Function GetHTMLForTagsAndNotes(ByVal ImageFullPath As String) As String

        Dim strXMPFilename As String = ImageFullPath & ".xmp"
        Dim doc As New Xml.XmlDocument()
        Dim strNote As String
        Dim lstTags As New List(Of String)
        Dim strReturnHTML As String = ""

        doc.Load(strXMPFilename)

        Try
            'Read xml notes and tags 
            '(START: NEED HELP HERE PLEASE)

            'If an acdsee:notes value exists
            strNote = "*** THIS VALUE ***"

            'For each tag that exists
            lstTags.Add("*** THIS VALUE ***")

            '(END: NEED HELP HERE PLEASE)

        Catch ex As Exception
            MsgBox(ex.Message)
        End Try

        'Format the tags and/or note as HTML and return

        Return strReturnHTML

    End Function

XML 格式为：

<?xml version="1.0" encoding="UTF-8"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 4.4.0-Exiv2">
 <rdf:RDF xmlns:rdf="URL//www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about=""
    xmlns:exif="URL//ns.adobe.com/exif/1.0/"
    xmlns:xmp="URL//ns.adobe.com/xap/1.0/"
    xmlns:xmpMM="URL//ns.adobe.com/xap/1.0/mm/"
    xmlns:darktable="URL//darktable.sf.net/"
    xmlns:acdsee="URL//ns.acdsee.com/iptc/1.0/"
    xmlns:dc="URL//purl.org/dc/elements/1.1/"
    xmlns:lr="URL//ns.adobe.com/lightroom/1.0/"
   exif:DateTimeOriginal=""
   xmp:Rating="1"
   xmpMM:DerivedFrom="SCAN_20230401_0392.jpg"
   darktable:import_timestamp="63815945870187001"
   darktable:change_timestamp="-1"
   darktable:export_timestamp="63841000148835795"
   darktable:print_timestamp="-1"
   darktable:xmp_version="5"
   darktable:raw_params="0"
   darktable:auto_presets_applied="1"
   darktable:history_end="4"
   darktable:iop_order_version="2"
   darktable:history_basic_hash="c80077d119ae746632f44df3493dfd64"
   darktable:history_current_hash="c80077d119ae746632f44df3493dfd64"
   acdsee:notes="*** THIS VALUE ***">
   <darktable:masks_history>
    <rdf:Seq/>
   </darktable:masks_history>
   <darktable:history>
    <rdf:Seq>
     <rdf:li
      darktable:num="0"
      darktable:operation="colorin"
      darktable:enabled="1"
      darktable:modversion="7"
      darktable:params="gz48eJxjZBgFowABWAbaAaNgwAEAEDgABg=="
      darktable:multi_name=""
      darktable:multi_priority="0"
      darktable:blendop_version="11"
      darktable:blendop_params="gz14eJxjYIAACQYYOOHEgAZY0QVwggZ7CB6pfNoAAE8gGQg="/>
    </rdf:Seq>
   </darktable:history>
   <dc:subject>
    <rdf:Bag>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
    </rdf:Bag>
   </dc:subject>
   <lr:hierarchicalSubject>
    <rdf:Bag>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
     <rdf:li>*** THIS VALUE ***</rdf:li>
    </rdf:Bag>
   </lr:hierarchicalSubject>
  </rdf:Description>
 </rdf:RDF>
</x:xmpmeta>

Answer 1

请尝试以下解决方案。

VB.NET

Sub Main
    Const FILENAME As String = "e:\Temp\JakeSmith.xml"

    Dim xdoc As XDocument = XDocument.Load(FILENAME)
    Dim ns As XNamespace = "URL//www.w3.org/1999/02/22-rdf-syntax-ns#"

    Dim listOfString As List(Of String) = xdoc.Descendants(ns + "li").Where(Function(x) x.Parent.Name.LocalName = "Bag").[Select](Function(x) x.Value).ToList()
    Console.Write(listOfString)
End Sub