XmlDocument递归节点处理示例
这不是一个问题,而是一个可能对像我这样想研究VB.NET XmlDocument节点层次结构如何工作的人有用的示例 下面的子例程递归遍历XML文档树,显示遇到的元素和属性XmlDocument递归节点处理示例,xml,vb.net,Xml,Vb.net,这不是一个问题,而是一个可能对像我这样想研究VB.NET XmlDocument节点层次结构如何工作的人有用的示例 下面的子例程递归遍历XML文档树,显示遇到的元素和属性 Private Sub XmlDocumentWalker(XmlNode As XmlNode) If TypeOf XmlNode Is XmlComment Then MsgBox(XmlNode.Value, MsgBoxStyle.OkOnly, "XML Comment")
Private Sub XmlDocumentWalker(XmlNode As XmlNode)
If TypeOf XmlNode Is XmlComment Then
MsgBox(XmlNode.Value, MsgBoxStyle.OkOnly, "XML Comment")
If XmlNode.HasChildNodes Then XmlDocumentWalker(XmlNode.FirstChild)
If Not IsNothing(XmlNode.NextSibling) Then XmlDocumentWalker(XmlNode.NextSibling)
ElseIf TypeOf XmlNode Is XmlElement Then
If XmlNode.HasChildNodes And (TypeOf XmlNode.FirstChild Is XmlText) Then
MsgBox(XmlNode.Name & "=""" & XmlNode.FirstChild.Value & """", MsgBoxStyle.OkOnly, "XML Element")
Else
MsgBox(XmlNode.Name, MsgBoxStyle.OkOnly, "XML Element")
End If
If DirectCast(XmlNode, XmlElement).HasAttributes Then
For Each XmlAttribute As XmlNode In DirectCast(XmlNode, XmlElement).Attributes
MsgBox(XmlAttribute.Name & "=""" & XmlAttribute.Value & """", MsgBoxStyle.OkOnly, "XML Attribute")
Next
End If
If XmlNode.HasChildNodes And Not (TypeOf XmlNode.FirstChild Is XmlText) Then XmlDocumentWalker(XmlNode.FirstChild)
If Not IsNothing(XmlNode.NextSibling) Then XmlDocumentWalker(XmlNode.NextSibling)
End If
End Sub
提供以下代码来说明如何实际加载要由XMLDocumentWalker子例程遍历的XML文档:
Private XmlDocument As XmlDocument
Private ValidationErrorCount As Integer
Public Sub Load()
ValidationErrorCount = 0
Try
Dim XmlReader As XmlReader
Dim XmlReaderSettings As New XmlReaderSettings()
Dim ValidationEventHandler As New ValidationEventHandler(AddressOf XMLValidationErrorMessage)
XmlReaderSettings.ValidationType = ValidationType.DTD
XmlReaderSettings.DtdProcessing = DtdProcessing.Parse
AddHandler XmlReaderSettings.ValidationEventHandler, ValidationEventHandler
XmlReader = XmlReader.Create(FileName, XmlReaderSettings)
XmlDocument = New XmlDocument()
XmlDocument.Load(XmlReader)
If 0 = ValidationErrorCount Then
XmlDocumentWalker(XmlDocument)
End If
Catch Exception As Exception
XmlDocument = Nothing
MsgBox(Exception.Message, MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "Configuration file load error")
End Try
End Sub
Private Sub XMLValidationErrorMessage(ByVal sender As Object, ByVal args As ValidationEventArgs)
If 0 = ValidationErrorCount Then
MsgBox(ConfigurationResource, MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "Configuration file invalid")
End If
MsgBox(args.Message, MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "XML format error")
ValidationErrorCount += 1
End Sub
因为这真的不是一个问题——我把它标记为已回答。你可以回答你自己的问题,但前提是你先问它。