Dim tr As WinForm.TreeView = e.Form.Controls("TreeView1")
tr.BuildTree("表A", "大类|二类|三类|四类")
5、“增加子节点”按钮的Click事件代码:
Dim tr As WinForm.TreeView
Dim nd As WinForm.TreeNode
tr = e.Form.Controls("TreeView1")
nd = tr.SelectedNode
If nd IsNot Nothing Then
If nd.Level = 3 Then
MessageBox.Show("最多允许四层节点!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
Else
Dim dr As DataRow = DataTables("表A").AddNew
If nd.Level = 0 Then
dr("大类") = nd.Text
dr("二类") = "新节点"
ElseIf nd.Level = 1
dr("大类") = nd.ParentNode.Text
dr("二类") = nd.text
dr("三类") = "新节点"
ElseIf nd.Level = 2
dr("大类") = nd.ParentNode.ParentNode.Text
dr("二类") = nd.ParentNode.Text
dr("三类") = nd.text
dr("四类") = "新节点"
End If
nd = nd.Nodes.Add("新节点")
tr.SelectedNode = nd
tr.Select()
tr.BeginEdit()
End If
End If
6、“删除”按钮的Click事件代码:
Dim tr As WinForm.TreeView = e.Form.Controls("TreeView1")
Dim nd As WinForm.TreeNode = tr.SelectedNode
If nd IsNot Nothing Then
Dim pth() As String = nd.FullPath.Split("\")
Select Case nd.Level
Case 0
DataTables("表A").DeleteFor("大类 = '" & pth(0) & "'")
Case 1
DataTables("表A").DeleteFor("大类 = '" & pth(0) & "' And 二类 = '" & pth(1) & "'")
Case 2
DataTables("表A").DeleteFor("大类 = '" & pth(0) & "' And 二类 = '" & pth(1) & "' And 三类 = '" & pth(2) & "'")
Case 3
DataTables("表A").DeleteFor("大类 = '" & pth(0) & "' And 二类 = '" & pth(1) & "' And 三类 = '" & pth(2) & "' And 四类 = '" & pth(3) & "'")
End Select
nd.Delete()
End If
tr.Select()