asp.net - 循环复选框列表并使用 XMLTextWriter VB.net 创建 XML

Question

我是 xml 和 .net 的初学者开发人员。我有一系列复选框列表，我想根据用户选择生成一个 xml 文件。我希望xml文件是这样的。

<?xml version="1.0" encoding="utf-8"?>
  <FILTER xmlns:x="urn:1">
    <CATEGORY Name="Year">
      <SELECTED Value="2011/2010" />
      <SELECTED Value="2010/2009" />
      <SELECTED Value="2009/2008" />
    </CATEGORY>
    <CATEGORY Name="Grade">
      <SELECTED Value="Kindergarten 1" />
    </CATEGORY>   
  </FILTER>

但我只得到这个

<?xml version="1.0" encoding="utf-8"?>
  <FILTER xmlns:x="urn:1">
    <CATEGORY Name="Year">
      <SELECTED Value="2011/2010" />
    </CATEGORY>
    <CATEGORY Name="Year">
      <SELECTED Value="2010/2009" />
    </CATEGORY>
    <CATEGORY Name="Year">
      <SELECTED Value="2009/2008" />
    </CATEGORY>
    <CATEGORY Name="Grade">
      <SELECTED Value="Kindergarten 1" />
    </CATEGORY>
  </FILTER>

这是我用来创建 xml 文件的 VB 代码。请告诉我我错过了什么。非常感谢您的帮助。

Dim itemacademicyear As ListItem
Dim itemgrade As ListItem

Dim w As New XmlTextWriter(Server.MapPath("items.xml"), Encoding.UTF8)
w.Formatting = Formatting.Indented
w.WriteStartDocument()
w.WriteStartElement("FILTER")
w.WriteAttributeString("xmlns", "x", Nothing, "urn:1")

For Each itemacademicyear In cblacademicyear.Items
  If itemacademicyear.Selected = True Then
    lblselected.Text = lblselected.Text & itemacademicyear.Text & "&nbsp;" & "<a href='#'>remove</a>" & "<BR>"

    'xml bit
    w.WriteStartElement("CATEGORY")
    w.WriteAttributeString("Name", "Year")
    w.WriteStartElement("SELECTED")
    w.WriteAttributeString("Value", itemacademicyear.Text)
    w.WriteEndElement()
    w.WriteEndElement()
  End If
Next

Answer 1

您需要将您的类别元素创建移出循环：

w.WriteStartElement("CATEGORY")
w.WriteAttributeString("Name", "Year")

For Each itemacademicyear In cblacademicyear.Items
    If itemacademicyear.Selected = True Then
        lblselected.Text = lblselected.Text & itemacademicyear.Text & "&nbsp;" & "<a href='#'>remove</a>" & "<BR>"

        'xml bit
        w.WriteStartElement("SELECTED")
        w.WriteAttributeString("Value", itemacademicyear.Text)
        w.WriteEndElement()

    End If
Next

w.WriteEndElement()