If e.DataCol.Name = "日期" Then If e.DataRow.IsNull("日期") Then e.DataRow("编号") = Nothing Else Dim d As Date = e.DataRow("日期") Dim y As Integer = d.Year Dim fd As Date = New Date(y,1,1) '获得该月的第一天 Dim ld As Date = fd.AddYears(1) Dim bh As String = Format(d,"yyyy") '生成编号的前6位,4位年,2位月. If e.DataRow("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(编号)","日期 >= #" & fd & "# And 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(bh.length+1)) + 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") = bh & "-" & Format(idx,"000") End If End If End If
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