标题：在项目事件找不出这些代码

项目事件

BuildDetail

If e.Book.TempLate = "SalesInvoice" Then

    If e.region = "SaleOrderDetail" Then

        If e.DataRow Is Nothing OrElse e.DataRow.IsNull("Lot") Then '如果是空行或者Lot列为空

            Dim img As New System.Drawing.Bitmap(1,1) '生成一个空白图片

            img.Save(ProjectPath & "Images\BarCode.gif")

        Else '否则生成条形码图片

            Dim Bar As New BarCodeBuilder

            Bar.Symbology = Barpro.Symbology.Code39

            Bar.Code = e.DataRow("Lot")

            Bar.BarRatio = 0.3

            Bar.BarHeight = 8

            bar.SaveImage(ProjectPath & "Images\BarCode.gif",300)

        End If

    End If

End If

生成二维码项目，这些代码放在哪里，找来找去都找不出来