主题：自动编号

Select e.DataCol.Name
    Case "送检_送检日期","代号","预算编号"
        If e.DataRow.IsNull("送检_送检日期") OrElse e.DataRow.IsNull("代号") OrElse e.DataRow.IsNull("预算编号") Then
            e.DataRow("送检_送检单编号") = Nothing
        Else
            Dim d As Date = e.DataRow("送检_送检日期")
            Dim y As Integer = d.Year
            Dim m As Integer = d.Month
            Dim Days As Integer = Date.DaysInMonth(y,m)
            Dim fd As Date = New Date(y,m,1) '获得该月的第一天
            Dim ld As Date = New Date(y,m,Days) '获得该月的最后一天
            Dim bh As String = e.DataRow("代号") & "-" & Format(d,"yyyyMM") & "-"
            Dim max As String
            Dim idx As Integer
            Dim flt As String
            flt = "代号 = '"& e.DataRow("代号") & "' And 预算编号 = '"& e.DataRow("预算编号") & "' and 送检_送检日期 >= #" & fd & "# And 送检_送检日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")
            Dim flt2 = "代号 = '"& e.DataRow("代号") & "' and 送检_送检日期 >= #" & fd & "# And 送检_送检日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")
            Dim fdr As DataRow = e.DataTable.find(flt & " and 送检_送检单编号 is not null and 送检_送检日期 = #" & d & "#")
            If fdr Is Nothing Then
                max = e.DataTable.Compute("Max(送检_送检单编号)",flt2) '取得该月的相同部门代号的最大报告单送检_送检单编号
                If max > "" Then '如果存在最大报告单送检_送检单编号
                    idx = CInt(max.Substring(bh.length+1)) + 1 '获得最大报告单送检_送检单编号的后四位顺序号,并加1
                Else
                    idx = 1 '否则顺序号等于1
                End If
                e.DataRow("送检_送检单编号") = bh & Format(idx,"0000")
            Else
                e.DataRow("送检_送检单编号") = fdr("送检_送检单编号")
            End If
        End If       
End Select