主题：关于流水账余额筛选后余额显示的不是筛选表数据的问题。

Select Case e.DataCol.Name
    Case "收入","支出"
        Dim f As String = iif(Tables("表A").Filter>"", " and (" & Tables("表A").Filter & ")", "")
        Dim dr As DataRow
        Dim drs As List(of DataRow)
        dr = e.DataTable.Find("[_SortKey] < " & e.DataRow("_SortKey") & f, "[_SortKey] Desc") '找出上一行
        If dr Is Nothing Then '如果没有找到上一行,说明本行就是第一行
            e.DataRow("余额") = e.DataRow("收入") - e.DataRow("支出")
            dr = e.DataRow
        End If
        drs = e.DataTable.Select("[_SortKey] >= " & dr("_SortKey") & f, "[_SortKey]")
        For i As Integer = 1 To drs.Count - 1 '重算余下行的余额
            drs(i)("余额") = drs(i-1)("余额") + drs(i)("收入") - drs(i)("支出")
        Next
End Select