主题：请教，目录树貌能否只对加载列进行建树？

With DataTables("收文")

    .LoadFilter = "" '设置加载条件

    .LoadFilter = "办文单位 = '" & _UserOffice  & "'"

    .LoadPage = 0 '加载第一页

    .LoadTop = 20 '每页20行

    .Load()

    e.Form.Controls("TextBox4").Value = 1 & "/" & .TotalPages

End With

'生成目录树

Dim cmd As New SQLCommand

Dim dt As DataTable

cmd.C

cmd.CommandText = "SELECT DISTINCT Year(收文日期) As 年, Month(收文日期) As 月 From {收文}"

dt = cmd.ExecuteReader()

Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")

trv.BuildTree(dt, "年|月")

Dim Value() As String

Dim Filter As String

Dim d1 As Date

Dim d2 As Date

Value = e.Node.FullPath.Split("\")

Select Case e.Node.Level

    Case 0

        Dim y As Integer = value(0)

        d1 = New Date(y,1,1) '取得该年的第一天

        d2 = new Date(y,12,31) '取得该年的最后一天

        Filter = "收文日期 >= #" & d1 & "# And 收文日期 <= #" & d2 & "#"

    Case 1

        Dim y As Integer = value(0)

        Dim m As Integer = value(1)

        d1 = New Date(y, m, 1) '取得该月的第一天

        d2 = new Date(y, m, Date.DaysInMonth(y,m)) '取得该月的最后一天

        Filter = "收文日期 >= #" & d1 & "# And 收文日期 <= #" & d2 & "#"

    

End Select

Tables("收文").Filter = Filter