主题：另存pdf的问题

Dim Book As New XLS.Book(ProjectPath & "Attachments\添加订单.xls")
Dim fl As String = ProjectPath & "Reports\添加订单.xls"
Book.Save(ProjectPath & "Reports\添加订单.xls")
Dim Proc As New Process
Proc.File = fl

Dim App As New MSExcel.Application
Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open(fl)
Dim Ws As MSExcel.WorkSheet = Wb.WorkSheets(1)
App.Visible = True
wb.ExportAsFixedFormat(MSExcel.XlFixedFormatType.xlTypePDF, ProjectPath & "test.pdf", MsExcel.XlFixedFormatQuality.xlQualityStandard, True, True,  System.Reflection.Missing.Value,  System.Reflection.Missing.Value, False,  System.Reflection.Missing.Value)
'Ws.PrintPreview
App.Visible=False
wb.save
wb.close
App.Quit

帮忙看看这段代码是哪个地方有问题？ 我原先的意图是想把 生成的报表另存为pdf 文件，但是现在pdf 文件显示的不是 我要的报表啊，