本文整理汇总了VB.NET中System.Web.UI.WebControls.HierarchicalDataBoundControl.GetData方法的典型用法代码示例。如果您正苦于以下问题：VB.NET HierarchicalDataBoundControl.GetData方法的具体用法？VB.NET HierarchicalDataBoundControl.GetData怎么用？VB.NET HierarchicalDataBoundControl.GetData使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Web.UI.WebControls.HierarchicalDataBoundControl的用法示例。
在下文中一共展示了HierarchicalDataBoundControl.GetData方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: PerformDataBinding
Protected Overrides Sub PerformDataBinding()
MyBase.PerformDataBinding()
' Do not attempt to bind data if there is no
' data source set.
If Not IsBoundUsingDataSourceID AndAlso DataSource Is Nothing Then
Return
End If
Dim view As HierarchicalDataSourceView = GetData(RootNode.DataPath)
If view Is Nothing Then
Throw New InvalidOperationException _
("No view returned by data source control.")
End If
Dim enumerable As IHierarchicalEnumerable = view.Select()
If Not (enumerable Is Nothing) Then
Nodes.Clear()
Try
RecurseDataBindInternal(RootNode, enumerable, 1)
Finally
End Try
End If
End Sub
Private Sub RecurseDataBindInternal(ByVal node As TreeNode, _
ByVal enumerable As IHierarchicalEnumerable, _
ByVal depth As Integer)
Dim item As Object
For Each item In enumerable
Dim data As IHierarchyData = enumerable.GetHierarchyData(item)
If Not data Is Nothing Then
' Create an object that represents the bound data
' to the control.
Dim newNode As New TreeNode()
Dim rvnode As New RootViewNode()
rvnode.Node = newNode
rvnode.Depth = depth
' The dataItem is not just a string, but potentially
' an XML node or some other container.
' If DataTextField is set, use it to determine which
' field to render. Otherwise, use the first field.
If DataTextField.Length > 0 Then
newNode.Text = DataBinder.GetPropertyValue _
(data, DataTextField, Nothing)
Else
Dim props As PropertyDescriptorCollection = _
TypeDescriptor.GetProperties(data)
' Set the "default" value of the node.
newNode.Text = String.Empty
' Set the true data-bound value of the TextBox,
' if possible.
If props.Count >= 1 Then
If Not props(0).GetValue(data) Is Nothing Then
newNode.Text = props(0).GetValue(data).ToString()
End If
End If
End If
Nodes.Add(rvnode)
If data.HasChildren Then
Dim newEnumerable As IHierarchicalEnumerable = _
data.GetChildren()
If Not (newEnumerable Is Nothing) Then
RecurseDataBindInternal(newNode, _
newEnumerable, depth + 1)
End If
End If
If MaxDepth < depth Then
MaxDepth = depth
End If
End If
Next item
End Sub