ASP.NET Tutorial/XML/XMLTextWriter — различия между версиями

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Текущая версия на 11:57, 26 мая 2010

Use XmlTextWriter to create XML document, then use XmlTextReader to read it back

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="MyPage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Create XML Document" />
        <asp:Button ID="Button2" runat="server" Text="Display XML Document" />
        <asp:Label ID="result" runat="server Text="Label"></asp:Label>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.Xml
Imports System.IO
Partial Class MyPage
    Inherits System.Web.UI.Page
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.result.Text = ""
        Dim xmlTW As New XmlTextWriter("Data.xml", Nothing)
        xmlTW.WriteStartDocument()
        xmlTW.WriteStartElement("A")
        xmlTW.WriteStartElement("B")
        xmlTW.WriteAttributeString("C", "D", "E")
        xmlTW.WriteStartElement("F")
        xmlTW.WriteString("97")
        xmlTW.WriteEndElement()
        xmlTW.WriteEndElement()
        xmlTW.WriteStartElement("G")
        xmlTW.WriteAttributeString("H", "I", "J")
        xmlTW.WriteStartElement("K")
        xmlTW.WriteString("99")
        xmlTW.WriteEndElement()
        xmlTW.WriteStartElement("L")
        xmlTW.WriteString("95")
        xmlTW.WriteEndElement()
        xmlTW.WriteEndElement()
        xmlTW.WriteEndElement()
        xmlTW.WriteEndDocument()
        xmlTW.Close()
        Me.result.Text = "XML document created"
    End Sub
    Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
        If Me.result.Text <> "" Then
            Dim fs As New FileStream("Data.xml", FileMode.Open)
            Dim xmlTR As New XmlTextReader(fs)
            Dim str As String
            While xmlTR.Read()
                str = str & "<b>Type:</b>" & xmlTR.NodeType.ToString & "<br>"
                If xmlTR.Name <> "" Then
                    str = str & "<b>Name:</b>" & xmlTR.Name & "<br>"
                End If
                If xmlTR.Value <> "" Then
                    str = str & "<b>Value:</b>" & xmlTR.Value & "<br>"
                End If
                If xmlTR.AttributeCount > 0 Then
                    str = str & "<b>Attribute:</b>"
                    Dim i As Integer
                    For i = 0 To xmlTR.AttributeCount - 1
                        str = str & " " & xmlTR.GetAttribute(i) & " "
                    Next
                    str = str & "<br>"
                End If
                str = str & "<br>"
            End While
            Me.result.Text = str
        Else
            Me.result.Text = "Create XML document first"
        End If
    End Sub
End Class


Use XMLTextWriter to create XML file (VB.net)

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Xml" %>
<script runat=server>
   sub Page_Load(Sender as Object, e as EventArgs)
      dim writer as XMLTextWriter
         
      try
         writer = new XMLTextWriter(Server.MapPath("Data.xml"), nothing)
         
         writer.WriteStartDocument
         writer.Formatting = Formatting.Indented
         writer.Indentation = 3
         writer.WriteStartElement("bookstore")
         writer.WriteStartElement("book")
         writer.WriteAttributeString("genre", "history")
         writer.WriteElementString("title", "my title")
         writer.WriteElementString("price","6.99")
         writer.WriteStartElement("author")
         writer.WriteElementString("first-name","M")
         writer.WriteEndElement()
         writer.WriteEndElement()
         writer.WriteEndElement()
         writer.Flush
      catch ex as Exception
         Response.Write("Error accessing XML file")
      finally
         writer.Close
         Response.Write("Finished processing")
      end try
   end sub
</script>
<html><body>
</body></html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/XML/XMLTextWriter&oldid=2948»