主题：加载树统计数据错误

有可能是你代码中的表名或列名错了。

代码改成这样

Dim dt As DataTable
Dim b As New GroupTableBuilder("统计表1",DataTables("计划表"))
b.Groups.AddDef("日期",DateGroupEnum.Year,"年")
b.Groups.AddDef("日期",DateGroupEnum.Month,"月")
b.Groups.AddDef("状态")
b.Totals.AddDef("编号",AggregateEnum.Count,"数量") '根据主键列来统计记录数,也就是订单数
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|状态")

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("状态")
    Select Case nd.Level
        Case 0
            nd.Text = nd.text & "年(" & dt.Compute("Sum(数量)","年 = " & Year) & "条)"
        Case 1
            nd.Text = nd.text & "月(" & dt.Compute("Sum(数量)","年 = " & Year & " And 月 = " & Month) & "条)"
        Case 2
            nd.Text = nd.text & "(" & nd.DataRow("数量") & ")"
    End Select
Next
trv.Nodes.Insert("加载所有行","加载所有行(" & dt.Compute("Sum(数量)") & "条)",0)
trv.ResumeRedraw