asp.net 读取excel模版，设置excel的单元格为下拉框

[yrmb88]

string filePath = Server.MapPath("aaa/上岗证导入模板.xls");

object missing = Missing.Value;

KillProcess("Excel");//首先杀死进程
Excel.Application xlApp = new Excel.Application();

xlApp.Visible = false; xlApp.UserControl = true;
Excel.Workbook workbook = xlApp.Workbooks.Open(filePath, missing, false, missing, missing, missing, missing, missing, missing, true, missing, missing, missing, missing, missing);

Excel.Worksheet worksheet = (Worksheet)workbook.Sheets.get_Item(1);

worksheet.get_Range("A:A", Type.Missing).Validation.Add(XlDVType.xlValidateList, XlDVAlertStyle.xlValidAlertStop, Type.Missing, "1,2,3", Type.Missing);
//设置excel单元格为下拉框，报错了，同样的代码如果不读取模版而是自动创建一个excel就没问题··
workbook.SaveCopyAs("D:\\111.xls");

报这个鬼错误，说什么服务器出现意外情况，检查该异常的 ErrorCode 属性，以确定 COM 对象返回的 HRESULT

请高手指点，网上太多这样的代码，请不要帖别人的代码过来，，弄了好长时间了···在线等····

[yrmb88]

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