[求助]自定义筛选树：未将对象引用设置到对象的实例 - 专家坐堂 - 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!

项目重新打开就出现未将对象引用设置到对象的实例

'首先生成统计表

Dim dt As DataTable

Dim b As New GroupTableBuilder("统计表1",DataTables("涂胶检验"))

b.Groups.AddDef("日期",DateGroupEnum.Year,"年")

b.Groups.AddDef("日期",DateGroupEnum.Month,"月")

b.Groups.AddDef("日期",DateGroupEnum.day,"日")

b.Groups.AddDef("型号")

b.Totals.AddDef("投入",AggregateEnum.sum,"投入")

b.Totals.AddDef("不良率",AggregateEnum.sum,"不良率")

dt = b.Build(False) '参数设置为False,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|日|型号")

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 day As Integer = nd.DataRow("日")

Dim Product As String = nd.DataRow("型号")

Select Case nd.Level

Case 0

nd.Text = nd.text & "年(投入" & dt.Compute("Sum(投入)","年 = " & Year) & "m,不良率" & Format(dt.Compute("AVG(不良率)","年 = " & Year),"#0.00") & "%)"

Case 1

nd.Text = nd.text & "月(投入" & dt.Compute("Sum(投入)","年 = " & Year & " And 月 = " & Month) & "m,不良率" & Format(dt.Compute("AVG(不良率)","年 = " & Year & " And 月 = " & Month),"#0.00") & "%)"

Case 2

nd.Text = nd.text & "日(投入" & dt.Compute("Sum(投入)","年 = " & Year & " And 月 = " & Month & " And 日 = " & day) & "m, 不良率" & Format(dt.Compute("AVG(不良率)","年 = " & Year & " And 月 = " & Month & " And 日 = " & day),"#0.00") & "%)"

Case 3

nd.Text = nd.text & "(" & nd.DataRow("投入") & "m)"

End Select

trv.Nodes.Insert("显示所有行","显示所有行(" & dt.Compute("Sum(投入)") & "m)",0)

trv.ResumeRedraw

-----------------------------------------------------------------------------------

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 d3 As Date

Dim Year As Integer = e.Node.DataRow("年")

Dim Month As Integer = e.Node.DataRow("月")

Dim day As Integer = e.Node.DataRow("日")

Dim Product As String = e.Node.DataRow("型号")

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, day)

Filter = "日期 >= #" & d1 & "# And 日期 < #" & d1.AddDays(1) & "#"

Case 3

d1 = New Date(Year, Month, day)

Filter = "日期 >= #" & d1 & "# And 日期 < #" & d1.AddDays(1) & "# And 型号 = '" & Product & "'"

End Select

End If

Tables("涂胶检验").Filter = Filter

主题：[求助]自定义筛选树：未将对象引用设置到对象的实例