簡單的XML R/W 範例

Note:.net compact framework 2.0,Windows mibile 5.0
這篇主要是回復網友問題時做的測試程式，原文在這邊，下面來看看測試的程式碼
XML內容是像下面這樣

程式碼部分

Imports System.Xml
Public Class Form1
    Dim xmlDoc As XmlDocument
    Dim strTmp As String = ""

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        xmlDoc = New Xml.XmlDocument()
        ''載入XML文件
        xmlDoc.Load(GetAppPath() & "\test.xml")
    End Sub

    Private Sub btnDisplay_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDisplay.Click
        Dim xnodelist As Xml.XmlNodeList = xmlDoc.SelectNodes(txtXPath.Text)
        If xnodelist.Count > 0 Then
            DisplayXmlNode(xnodelist)
        Else
            TextBox1.Text = "Not found"
        End If
    End Sub

    Private Sub DisplayXmlNode(ByRef xNodeList As XmlNodeList)
        For Each x As Xml.XmlNode In xNodeList
            If x.HasChildNodes Then
                DisplayXmlNode(x.ChildNodes)
            Else
                strTmp = "Node Name=" & x.Name
                If x.Attributes.Count > 0 Then
                    For Each z As Xml.XmlAttribute In x.Attributes
                        strTmp &= " Attribute Name=" & z.Name & " Value=" & z.Value
                        If UCase(z.Name) = "KEY" Then
                            cboItem.Items.Add(z.Value)
                        End If
                    Next
                End If
                TextBox1.Text &= vbCrLf & strTmp
            End If
        Next
    End Sub

    Private Sub btnModify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnModify.Click
        Dim xnodelist As Xml.XmlNodeList = xmlDoc.SelectNodes(txtXPath.Text)
        If xnodelist.Count > 0 Then
            ModifyValue(xnodelist)
        Else
            MessageBox.Show("Not found")
        End If
    End Sub

    ''' 

    ''' 土法煉鋼修改
    ''' 
    ''' 
    ''' 
    Private Sub ModifyValue(ByRef xNodeList As XmlNodeList)
        For Each x As Xml.XmlNode In xNodeList
            If x.HasChildNodes Then
                ModifyValue(x.ChildNodes)
            Else
                ''判斷xmlNode是否有Attributes
                If x.Attributes.Count > 0 Then
                    ''尋找所有的Attributes
                    For Each z As Xml.XmlAttribute In x.Attributes
                        ''判斷名稱為key且值為value的Attributes
                        If (UCase(z.Name) = "KEY") AndAlso (z.Value = cboItem.Text) Then
                            ''判斷是否有value的Attributes
                            If x.Attributes("value") IsNot Nothing Then
                                ''變更
                                x.Attributes("value").Value = txtNewValue.Text
                            End If
                        End If
                    Next
                End If
                TextBox1.Text &= vbCrLf & strTmp
            End If
        Next
        If chkAutoSave.Checked Then xmlDoc.Save(GetAppPath() & "\test.xml")
        MessageBox.Show("Modify success")
    End Sub

    Public Function GetAppPath() As String
        Return System.IO.Path.GetDirectoryName(Reflection.Assembly.GetExecutingAssembly.GetName.CodeBase.ToString)
    End Function
End Class

完整的程式碼可以在這邊下載