Question

[！[在此处输入图像说明] [1]] [1]我的树视图的设计视图：

 <asp:TreeView ID="TreeView1" ShowExpandCollapse="true" runat="server" ShowCheckBoxes="Leaf"
            ViewStateMode="Enabled">
        </asp:TreeView>

代码：

Private Sub MyProject_Load(sender As Object, e As EventArgs) Handles Me.Load

     ' MY DATATABLE WITH THE VALUES:
        Dim dt as datatable = mymethodtoreadvaluesfrombd()
       TreeView1.Nodes.Clear()
            Dim node As TreeNode
            Dim subNode As TreeNode
            For Each row As DataRow In dt.Rows

                node = Searchnode(row.Item(2).ToString(), TreeView1)
                If node IsNot Nothing Then

                    subNode = New TreeNode(row.Item(3).ToString())

                    subNode.ShowCheckBox = True
                    node.ChildNodes.Add(subNode)
                Else
                    node = New TreeNode(row.Item(2).ToString())
                    subNode = New TreeNode(row.Item(3).ToString())

                    node.ChildNodes.Add(subNode)
                    TreeView1.Nodes.Add(node)
                End If
            Next
End Sub

 Private Function Searchnode(ByVal nodetext As String, ByVal trv As TreeView) As TreeNode
        For Each node As TreeNode In trv.Nodes
            If node.Text = nodetext Then
                Return node
            End If
        Next
    End Function

我有一个按钮，当我点击它时，我需要阅读我的树视图中检查的子节点。我找不到尝试多种代码的方式，有人能建议我吗？感谢。

Answer 1

您可以执行第二个for...each循环来遍历子节点：

For Each Parentnode as TreeNode in TreeVeiw1.Nodes
    For Each Childnode as Treenode in Parentnode.Nodes
        If Childnode.checked Then

        End If
    Next
Next

我对ID的建议（请参阅下面的评论）是使用Childnode.Tag，大多数控件都包含.Tag，您可以在其中存储数据。

Answer 2

我在代码中看到了问题，

问题是，当我点击按钮时会出现一个autopostback事件，它会删除树视图复选框，所以我把它放在加载中，直接转到按钮动作点击：

Private Sub MyProject_Load(sender As Object, e As EventArgs) Handles Me.Load

If not is postback then

' create the treeview

end if

End Sub

如何获取treeview vb.net中检查的子节点列表？

2 个答案: