使用VB.net格式化正确的路径以读取xml标记

Question

我想使用以下代码

Imports System.Xml

Public Class Form1

    Private Sub Convert_Button_Click(sender As Object, e As EventArgs) Handles  Convert_Button.Click
        Dim doc As New XmlDocument()
        doc.Load("C:\Test\Inventory.xml")
        Dim nodes As XmlNodeList = doc.DocumentElement.SelectNodes("/IXFleet/SyncData/Transaction")
        Dim product_id As String = "", product_name As String = "", product_price As String = ""
        For Each node As XmlNode In nodes
            product_id = node.SelectSingleNode("SiteID").InnerText
            product_name = node.SelectSingleNode("TankID").InnerText
            product_price = node.SelectSingleNode("TankNumber").InnerText
            MessageBox.Show(product_id & " " & product_name & " " & product_price)
        Next
    End Sub

End Class

我正在尝试阅读以下XML数据

<IXFleet>
  <SyncConfig xmlns="http://tempuri.org/SyncConfig.xsd"/>
  <SyncData xmlns="http://tempuri.org/SyncData.xsd">
    <Transaction>
     <SiteID>1</SiteID>
     <TankID>1</TankID>
     <TankNumber>1</TankNumber>
     </Transaction>
  </SyncData>
</IXFleet>

我的问题是我不知道如何正确格式化这部分代码（特别是标记路径的SyncData部分）实际到达Transaction节点，读取SiteID，TankID和TankNumber

Dim nodes As XmlNodeList = doc.DocumentElement.SelectNodes("/IXFleet/SyncData/Transaction")

如果我手动删除XML文件，SyncData节点中的额外数据（xmlns =“http://tempuri.org/SyncData.xsd”），并使用VB代码中的路径，它可以工作，放入额外的数据回到XML，它失败了，根本找不到任何数据。

任何帮助肯定会受到赞赏。

Answer 1

你需要一个NamespaceManager 。 然后使用名称空间前缀执行所有查询并传入管理器。

    Dim doc As New XmlDocument()
    doc.Load("C:\Test\Inventory.xml")
    Dim nsmgr = New XmlNamespaceManager(doc.NameTable)
    nsmgr.AddNamespace("sd", "http://tempuri.org/SyncData.xsd")
    Dim nodes As XmlNodeList = doc.DocumentElement.SelectNodes("/IXFleet/sd:SyncData/sd:Transaction", nsmgr)
    Dim product_id As String = "", product_name As String = "", product_price As String = ""
    For Each node As XmlNode In nodes
        product_id = node.SelectSingleNode("sd:SiteID", nsmgr).InnerText
        product_name = node.SelectSingleNode("sd:TankID", nsmgr).InnerText
        product_price = node.SelectSingleNode("sd:TankNumber", nsmgr).InnerText
        MessageBox.Show(product_id & " " & product_name & " " & product_price)
    Next