为什么这个 XPath 表达式获取太多数据？

Question

我有一个 XPath 表达式，它应该只从 XML 文档中返回/获取一个节点。但它正在变得不止这一点。我不明白为什么。

隐藏代码：

Dim xmlNameTbl As XmlNameTable = rootDoc.NameTable
Dim xmlNS As XmlNamespaceManager = New XmlNamespaceManager(xmlNameTbl)
xmlNS.AddNamespace("asp", "http://test.com/asp")

Dim sectionPosition As String = rowNode.GetAttribute("ID")
'In this example sectionPosition is "A03"

Dim sectionLetter As String = rowNode.GetAttribute("ID").Substring(0, 1)
Dim sectionRowNumberText As String = rowNode.GetAttribute("ID").Remove(0, 1)
Dim sectionRowNumber As Integer
Integer.TryParse(sectionRowNumberText, sectionRowNumber)

Dim addingNav As XPathNavigator = rootDoc.CreateNavigator

Dim hello = rootDoc.ChildNodes

Dim addingItr As XPathNodeIterator = addingNav.Select("//asp:TableRow[@ID='" & sectionPosition & "']", xmlNS)
'Nodes with A03 and A02 are being returned, even though it should be only A03 returned

XML 文档：

<?xml version="1.0" encoding="utf-8"?>
<Root xmlns:asp="http://test.com/asp" xmlns:meta="http://test.com/meta" xmlns:cc1="http://test.com/cc1">
  <asp:TableRow ID="A03">
    <asp:TableCell>
      <asp:Localize ID="tagthreeCtrlNumberRes" meta:resourcekey="tagthreeCtrlNumberRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="tagthreeCtrlDescRes" meta:resourcekey="tagthreeCtrlDescRes" runat="server" />
      <asp:Localize ID="tagthreeCtrlNoteRes" meta:resourcekey="tagthreeCtrlNoteRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:RadioButtonList ID="rblthreeCtrlRes0" RepeatDirection="Horizontal" runat="server">
        <asp:ListItem Text="Yes" meta:resourcekey="rblthreeCtrl0Res0" Value="1" />
        <asp:ListItem Text="No" meta:resourcekey="rblthreeCtrl1Res0" Value="0" />
        <asp:ListItem Text="N/A" meta:resourcekey="rblthreeCtrl2Res0" Value="2" />
      </asp:RadioButtonList>
      <asp:RadioButtonList ID="rblthreeCtrlRes1" RepeatDirection="Horizontal" runat="server">
        <asp:ListItem Text="Yes" meta:resourcekey="rblthreeCtrl0Res1" Value="1" />
        <asp:ListItem Text="No" meta:resourcekey="rblthreeCtrl1Res1" Value="0" />
        <asp:ListItem Text="N/A" meta:resourcekey="rblthreeCtrl2Res1" Value="2" />
      </asp:RadioButtonList>
    </asp:TableCell>
    <asp:TableCell>
      <asp:Button ID="cmdthreeCtrlRes" meta:resourcekey="cmdthreeCtrlRes" runat="server" OnClick="FormDataSave_Click" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="lblAssmthreeCtrlRes" meta:resourcekey="lblAssmthreeCtrlRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="lblQualthreeCtrlRes" meta:resourcekey="lblQualthreeCtrlRes" runat="server" />
      <asp:Button ID="cmdQualAcceptthreeCtrlRes" meta:resourcekey="cmdQualAcceptthreeCtrlRes" OnClick="cmdQualAccept_Click" runat="server" Text="Accept" Visible="True" />
    </asp:TableCell>
    <asp:TableCell />
    <asp:TableCell />
  </asp:TableRow>
  <asp:TableRow ID="A04">
    <asp:TableCell>
      <asp:Localize ID="tagoneCtrlNumberRes" meta:resourcekey="tagoneCtrlNumberRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="tagoneCtrlDescRes" meta:resourcekey="tagoneCtrlDescRes" runat="server" />
      <asp:Localize ID="tagoneCtrlNoteRes" meta:resourcekey="tagoneCtrlNoteRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="tagtxtoneCtrlRes0" meta:resourcekey="tagtxtoneCtrlRes0" runat="server" />
      <asp:Textbox ID="txtoneCtrlRes0" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Button ID="cmdoneCtrlRes" meta:resourcekey="cmdoneCtrlRes" runat="server" OnClick="FormDataSave_Click" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="lblAssmoneCtrlRes" meta:resourcekey="lblAssmoneCtrlRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell />
    <asp:TableCell />
    <asp:TableCell />
  </asp:TableRow>
  <asp:TableRow ID="A02">
    <asp:TableCell>
      <asp:Localize ID="tagtwoCtrlNumberRes" meta:resourcekey="tagtwoCtrlNumberRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="tagtwoCtrlDescRes" meta:resourcekey="tagtwoCtrlDescRes" runat="server" />
      <asp:Localize ID="tagtwoCtrlNoteRes" meta:resourcekey="tagtwoCtrlNoteRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="tagtxttwoCtrlRes0" meta:resourcekey="tagtxttwoCtrlRes0" runat="server" />
      <asp:Textbox ID="txttwoCtrlRes0" runat="server" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Button ID="cmdtwoCtrlRes" meta:resourcekey="cmdtwoCtrlRes" runat="server" OnClick="FormDataSave_Click" />
    </asp:TableCell>
    <asp:TableCell>
      <asp:Localize ID="lblAssmtwoCtrlRes" meta:resourcekey="lblAssmtwoCtrlRes" runat="server" />
    </asp:TableCell>
    <asp:TableCell />
    <asp:TableCell />
    <asp:TableCell />
  </asp:TableRow>
</Root>

Answer 1

我找不到上面的代码/XML 有什么问题。

运行您的示例按预期工作，addingItr.Count 返回 1。

我通过迭代返回的节点来仔细检查这一点，如下所示：

For Each n As XPathNavigator In addingItr
    Dim nodeName As String = n.Name
Next

您正在运行什么代码来确定返回节点的计数？

编辑

来源：XPathNodeIterator 类< /a>

XPathNavigator 类返回的 XPathNodeIterator 对象是
未定位在选定节点集中的第一个节点上。致电
必须使 XPathNodeIterator 类的 MoveNext 方法
将 XPathNodeIterator 对象定位在第一个节点上
选定的一组节点。

所以调试时看到的是根节点的 InnerXml 属性。