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作者： 整理

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
‘’Put user code to initialize the page here
Dim dl As New DataList
dl.HeaderTemplate = New CreateDL(ListItemType.Header)
dl.ItemTemplate = New CreateDL(ListItemType.Item)
dl.AlternatingItemTemplate = New CreateDL(ListItemType.AlternatingItem)
dl.FooterTemplate = New CreateDL(ListItemType.Footer)
Dim d As New Data
dl.DataSource = d.getTree
dl.DataBind()
div1.Controls.Add(dl)

End Sub



Public Class CreateDL
Implements ITemplate
Shared itemcount As Integer = 0
Dim TemplateType As ListItemType

Sub New(ByVal type As ListItemType)
TemplateType = type
End Sub

Sub InstantiateIn(ByVal container As Control) Implements ITemplate.InstantiateIn
Dim lc As New Literal
Select Case TemplateType
Case ListItemType.Header
lc.Text = "<TABLE border=1><TR><TH>Items</TH></TR>"
Case ListItemType.Item
lc.Text = "<TR><TD>Item number: " ‘’& itemcount.ToString & "</TD></TR>"
AddHandler lc.DataBinding, AddressOf TemplateControl_Databinding
Case ListItemType.AlternatingItem
lc.Text = "<TR><TD bgcolor=lightblue>Item number: " _
& itemcount.ToString & "</TD></TR>"
Case ListItemType.Footer
lc.Text = "</TABLE>"
End Select
container.Controls.Add(lc)
itemcount += 1
End Sub
Private Sub TemplateControl_DataBinding(ByVal sender As Object, _
ByVal e As System.EventArgs)
Dim lc As Literal
lc = CType(sender, Literal)
Dim container As DataListItem
container = CType(lc.NamingContainer, DataListItem)
lc.Text &= DataBinder.Eval(container.DataItem, "text")
lc.Text &= "</TD></TR>"
End Sub


End Class