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(lb.Length,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
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