Treeview 无限分类非递归终极解决方案

  这几天在写HRM的时候 这问题搞了我两天，哈哈！开始在使用Google 找了半天都是一堆垃圾，都是使用算法的较多， 后来就去了www.asp.net 找到点启示。

好了废话多说无用。

首先表结构如下 表名 Test

写个存储过程 GetTreeview

这个不用我说了吧下面用到

为了速度缓存DataTable

        Public Function GetTreeTable() As DataTable

                Dim dt As New DataTable()

                dt = HttpContext.Current.Cache("Treeview")

                If dt Is Nothing Then

                    Dim Conn As New SqlConnection

                    Dim clsConnDatabase As New ConnectionDatabase

                    Conn = clsConnDatabase.ConnDatabase

                    Dim Command As New SqlCommand

                    Command.Connection = Conn

                    Command.CommandText = "GetTreeview"

                    Command.CommandType = CommandType.StoredProcedure

                    Command.ExecuteNonQuery()

                    Dim da As New SqlDataAdapter(Command)

                    dt = New DataTable()

                    da.Fill(dt)

                    HttpContext.Current.Cache.Insert("Treeview", dt)

                End If

                Return dt

            End Function

这里是主要阿

Public Sub PopulateNodes(ByVal nodes As TreeNodeCollection, Optional ByVal intParentID As Int32 = 0)

                Dim dt As New DataTable()

                dt = clsWebForms.GetTreeTable()

                Dim strExpression As String

strExpression = "[parentID] = " & intParentID

                Dim foundRows() As DataRow

                foundRows = dt.Select(strExpression)

                Dim I As Integer

                For I = 0 To foundRows.GetUpperBound(0)

                    Dim tn As New TreeNode()

                    tn.Text = foundRows(I).Item(“TableName”).ToString()

                    tn.Value = foundRows(I).Item("ID").ToString()

                    Dim dr() As DataRow

                    dr = dt.Select("[parentID] = " & tn.Value)

                    If dr.GetUpperBound(0) > -1 Then

                        tn.PopulateOnDemand = True

                    End If

                    nodes.Add(tn)

                Next

            End Sub

建立WebForm 放入Treeview

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If Not Page.IsPostBack Then   

PopulateNodes(TreeView1.Nodes, 0)

        End If

    End Sub

    Protected Sub TreeView1_TreeNodePopulate(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.TreeNodeEventArgs) Handles TreeView1.TreeNodePopulate

                PopulateNodes(e.Node.ChildNodes, e.Node.Value)

    End Sub

至于速度我没测试，如果大家有兴趣帮忙测测。

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