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单统计累计，外部数据加载进来用下面内部表代码就弹窗，老师帮忙看看，谢谢

此主题相关图片如下：错误弹窗.png

Select Case e.DataCol.Name
     Case "生产批号", "实际产量"
         Dim dr As DataRow
         Dim mr As DataRow = e.DataRow
         Dim drs As List(Of DataRow)
         dr = e.DataTable.Find("[_SortKey]< " & mr("_SortKey") & " And [生产批号] = '" & mr("生产批号") & "'", "[_SortKey] Desc")
         If dr Is Nothing Then
             mr("累计产量") = mr("实际产量") + mr("累计产量")
             dr = mr
         End If
         drs = e.DataTable.Select("[_SortKey]>= " & dr("_SortKey") & " And [生产批号] = '" & dr("生产批号") & "'", "[_SortKey]")
         For i As Integer = 1 To drs.Count - 1
              drs(i)("累计产量") = drs(i - 1)("累计产量") + drs(i)("实际产量")
         Next
         If e.DataCol.Name = "生产批号" AndAlso e.OldValue IsNot Nothing AndAlso e.OldValue <> e.NewValue Then
             dr = e.DataTable.Find("[_SortKey]< " & mr("_SortKey") & " And [生产批号] = '" & e.OldValue & "'", "[_SortKey] Desc")
             If dr Is Nothing Then
                dr = e.DataTable.Find("[生产批号]= '" & e.OldValue & "'", "[_SortKey]")
                If dr IsNot Nothing Then
                    dr("累计产量") = dr("实际产量") + dr("累计产量")
                 End If
             End If
             If dr IsNot Nothing Then
                drs = e.DataTable.Select("[_SortKey]>= " & dr("_SortKey") & " And [生产批号] = '" & dr("生产批号") & "'", "[_SortKey]")
                For i As Integer = 1 To drs.Count - 1
                     drs(i)("累计产量") = drs(i - 1)("累计产量") + drs(i)("实际产量")
                 Next
             End If
         End If
End Select

主题：单条件累计