Select e.DataCol.Name
Case "登记日期","类别"
If e.DataRow.IsNull("登记日期") OrElse e.DataRow.IsNull("类别") Then
e.DataRow("编号") = Nothing
Else
Dim d As Date = e.DataRow("登记日期")
Dim y As Integer = d.Year
Dim bh As String = e.DataRow("类别") & "[" & Format(d,"yyyy") & "]" '生成编号的前缀
If e.DataRow("编号").StartsWith(bh) = False '如果立案编号前缀不符
Dim max As String
Dim idx As Integer
Dim flt As String
flt = "类别 = '"& e.DataRow("类别") & " 'And [_Identify] <> " & e.DataRow("_Identify") & " and Convert(登记日期, 'System.String') Like '" & y & "%'"
max = e.DataTable.Compute("Max(编号)",flt) '取得区划机关行为简称的最大单据编号
If max > "" Then '如果存在最大立案编号
idx = CInt(max.Substring(8,3)) + 1 '获得最大单据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("编号") = bh & Format(idx,"000")
End If
End If
End Select