Select e.DataCol.Name
    Case "制单日期"
        If e.DataRow.IsNull("制单日期") Then
            e.DataRow("送检单编号") = Nothing
        Else
            Dim d As Date = e.DataRow("制单日期")
            Dim y As Integer = d.Year
            Dim bh As String = Format(d,"yyyy")
            d = new Date(y, 1, 1)
            If e.DataRow("送检单编号").StartsWith(bh) = False
                Dim max As String
                Dim idx As Integer
                max = e.DataTable.Compute("Max(送检单编号)","制单日期 >= #" & d & "# And 制单日期 < #" & d.addyears(1) & "# and [_Identify] <> " & e.DataRow("_Identify"))
                If max > "" Then
                    idx = CInt(max.Substring(7)) + 1
                Else
                    idx = 1
                End If
                e.DataRow("内部合同编号") = bh & "-F-" & Format(idx,"000")
                e.DataRow.Save
            End If
        End If
End Select

教程上按类别编码

“类别”列是不是不能是表达式列？

我现在按教程编码，只是类别列是表达式，没反应！

Select e.DataCol.Name
Case "类别"
If e.DataRow.IsNull("类别") Then
e.DataRow("编号") = Nothing
Else
Dim lb As String = e.DataRow("类别")
If e.DataRow("编号").StartsWith(lb) = False \'如果单据编号前缀不符
Dim max As String
Dim idx As Integer
max = e.DataTable.Compute("Max(编号)","类别 = \'" & lb & "\' And [_Identify] <> " & e.DataRow("_Identify")) \'取得该类别的最大编号
If max > "" Then \'如果存在最大编号
idx = CInt(max.Substring(2,3)) + 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("编号") = lb & Format(idx,"000")
End If
End If
End Select

表达式列修改，不会触发datacolchanged事件，看看

http://www.foxtable.com/webhelp/scr/2381.htm

谢谢！改用跨表引用解决了！

另外采购管理台账中“编码”自动编号代码如下，想增加另外的功能，即如果“采购计划编号”相同，则“编码”也相同，该怎么改？

Select e.DataCol.Name
    Case "采购计划管理_预算输入部门代号"
        If e.DataRow.IsNull("采购计划管理_预算输入部门代号") Then
            e.DataRow("编码") = Nothing
        Else
            Dim lb As String = e.DataRow("采购计划管理_预算输入部门代号")
            If e.DataRow("编码").StartsWith(lb) = False \'如果单据编号前缀不符
                Dim max As String
                Dim idx As Integer
                max = e.DataTable.sqlCompute("Max(编码)","采购计划管理_预算输入部门代号 = \'" & lb & "\' And [_Identify] <> " & e.DataRow("_Identify")) \'取得该类别的最大编号
                If max > "" Then \'如果存在最大编号
                    idx = CInt(max.Substring(3,4)) + 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("编码") = lb & Format(idx,"0000")
            End If
        End If
End Select

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