如何从树视图中删除重复节点并将其项目合并到剩余的树节点（VB.net / C#）

Question

我想从树视图中删除重复的节点并将其数据合并到剩余的 TreeNode 中。 我正在创建一个windows应用程序，所有组件都是服务器端组件

Dim ParentTable As DataTable
     ParentTable = ds.Tables(0)
     Dim parentnode As TreeNode
        parentnode = New TreeNode("Tasks")
                    TreeView1.Nodes.Add(parentnode)
                    Dim MyTasks, Projects, Personal, Team As TreeNode
                    MyTasks = parentnode.Nodes.Add("My Tasks")
                    Projects = parentnode.Nodes.Add("Projects")
                    Personal = parentnode.Nodes.Add("Personal")
                    Team = parentnode.Nodes.Add("Team")
                    Dim Subparentnode As TreeNode
                    Dim childrow As DataRow
                    Dim childnode As TreeNode

                    For Each parentrow In ParentTable.Rows
                        Subparentnode = New TreeNode(parentrow.Item(12))
                        MyTasks.Nodes.Add(Subparentnode)
                        childnode = New TreeNode()
                    Next

                For Each parentrow In ParentTable.Rows
                    If (parentrow.Item(3) = 0 And parentrow.Item(4) = 0) Then
                        Subparentnode = New TreeNode(parentrow.Item(12))
                        Personal.Nodes.Add(Subparentnode)
                    End If


                    If Not (parentrow.Item(3) = 0 And parentrow.Item(4) = 0) Then
                        If Not (parentrow.Item(11) = "") Then
                            Dim isNotExists As Boolean
                            Dim node As New TreeNode
                            Dim SubparentnodeProjectName As TreeNode
                            SubparentnodeProjectName = New TreeNode(parentrow.Item(11))
                                                                                            Projects.Nodes.Add(SubparentnodeProjectName)
                                Subparentnode = New TreeNode(parentrow.Item(12))
                                SubparentnodeProjectName.Nodes.Add(Subparentnode)

                        End If
                    End If

            If (parentrow.Item(3) = 0 And Not parentrow.Item(4) = 0) Then
                Dim SubparentnodeProjectName As TreeNode
                SubparentnodeProjectName = New TreeNode(parentrow.Item(17))
                Team.Nodes.Add(SubparentnodeProjectName)
                Subparentnode = New TreeNode(parentrow.Item(12))
                SubparentnodeProjectName.Nodes.Add(Subparentnode)

            End If
                Next
            End If

c#代码也可以

我现在删除了重复节点，但无法合并重复节点的子节点。有谁能够帮我 ！

请提供一些代码

非常感谢任何帮助

谢谢你

Udit Bhardwaj

Answer 1

根据描述和 cmets，我可以提出一种方法来查找是否存在现有节点，如果没有，则创建一个新节点。

Function GetOrCreateTreeNode(root As TreeNode, newNodeName As String) As TreeNode
    For Each node As TreeNode In root.Nodes
        If node.Test = newNodeName Then
            Return node
        End If
    Next
    Dim newNode As TreeNode = New TreeNode(newNodeName)
    root.Nodes.Add(newNode)
    Return newNode
End Function

用法示例如下

        If (parentrow.Item(3) = 0 And Not parentrow.Item(4) = 0) Then
            Dim SubparentnodeProjectName As TreeNode
            'use the method to find existing node of the given name or create a new one if does not exists'
            SubparentnodeProjectName = GetOrCreateTreeNode(Team.LastNode, parentrow.Item(17))
            Subparentnode = New TreeNode(parentrow.Item(12))
            SubparentnodeProjectName.Nodes.Add(Subparentnode)
        End If

我假设上述方法是添加团队节点，您可以将其用于项目。