专家坐堂-[求助]目录树疑问Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

窗口代码：

\'首先生成统计表
Dim dt As DataTable
Dim b As New GroupTableBuilder("统计表1",DataTables("订单"))
b.Groups.AddDef("日期",DateGroupEnum.Year,"年")
b.Groups.AddDef("日期",DateGroupEnum.Month,"月")
b.Groups.AddDef("产品")
b.Totals.AddDef("客户",AggregateEnum.Count,"订单数") \'根据客户列来统计记录数,也就是订单数
dt = b.Build(True) \'参数设置为True,生成一个临时表,不在主界面显示
\'然后根据统计表生成目录树
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "年|月|产品")
trv.StopRedraw
For Each nd As WinForm.TreeNode In trv.AllNodes
    Dim Year As Integer = nd.DataRow("年")
    Dim Month As Integer = nd.DataRow("月")
    Dim Product As String = nd.DataRow("产品")
    Select Case nd.Level
        Case 0
            nd.Text = nd.text & "年(" & dt.Compute("Sum(订单数)","年 = " & Year) & "条)"
        Case 1
            nd.Text = nd.text & "月(" & dt.Compute("Sum(订单数)","年 = " & Year & " And 月 = " & Month) & "条)"
        Case 2
            nd.Text = nd.text & "(" & nd.DataRow("订单数") & "条)"
    End Select
Next
trv.Nodes.Insert("显示所有行","显示所有行(" & dt.Compute("Sum(订单数)") & "条)",0)
trv.ResumeRedraw

目录树代码：

Dim Filter As String = ""
If e.node.Name <> "显示所有行" Then \'要用Name属性,不能用Text属性
    Dim d1 As Date
    Dim d2 As Date
    Dim Year As Integer = e.Node.DataRow("年")
    Dim Month As Integer = e.Node.DataRow("月")
    Dim Product As String = e.Node.DataRow("产品")
    Select Case e.Node.Level
        Case 0
            d1 = New Date(Year,1,1) \'取得该年的第一天
            d2 = new Date(Year,12,31) \'取得该年的最后一天
            Filter = "日期 >= #" & d1 & "# And 日期 <= #" & d2 & "#"
        Case 1
            d1 = New Date(Year, Month, 1) \'取得该月的第一天
            d2 = new Date(Year, Month, Date.DaysInMonth(Year,Month)) \'取得该月的最后一天
            Filter = "日期 >= #" & d1 & "# And 日期 <= #" & d2 & "#"
        Case 2
            d1 = New Date(Year, Month, 1) \'取得该月的第一天
            d2 = new Date(Year, Month, Date.DaysInMonth(Year,Month)) \'取得该月的最后一天
            Filter = "日期 >= #" & d1 & "# And 日期 <= #" & d2 & "# And 产品 = \'" & Product & "\'"
    End Select
End If
Tables("订单").Filter = Filter