did you add a reference to Excel or use PIA?使用 Microsoft Visual C# 进行 Microsoft Word 2002 和 Excel 2002 编程 http://www.microsoft.com/china/msdn/library/dnexcl2k2/html/odc_offcs.aspPrimary Interop Assemblies (PIAs)http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/whypriinterop.aspWorking with the Office XP Primary Interop Assemblieshttp://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnoxpta/html/odc_oxppias.asp
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