If e.DataCol.Name = "派工日期" Then

    If e.DataRow.IsNull("派工日期") Then

        e.DataRow("派工单编号") = Nothing

    Else

        Dim d As Date = e.DataRow("派工日期")

        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 = Format(d,"yyyyMM") \'生成编号的前6位,4位年,2位月.

        If e.DataRow("派工单编号").StartsWith(bh) = False \'如果编号的前6位不符

            Dim max As String

            Dim idx As Integer

            max = e.DataTable.Compute("Max(派工单编号)","派工日期 >= #" & fd & "# And 派工日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")) \'取得该月的最大编号

            If max > "" Then \'如果存在最大编号

                idx = CInt(max.Substring(7,3)) + 1 \'获得最大编号的后三位顺序号,并加1

            Else

                idx = 1 \'否则顺序号等于1

            End If

            e.DataRow("派工单编号") = bh & "-" & Format(idx,"000")

        End If

    End If

End If