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object missing = Missing.Value;
GC.Collect();
ApplicationClass excel;
_Workbook xBk;
_Worksheet xSt;
excel = new ApplicationClass();
xBk = excel.Workbooks.Open(Server.MapPath("Uploads/Logistics/Masterplate.xls"), missing, missing, missing, missing, missing,
missing, missing, missing, missing, missing, missing, missing, missing, false);
xSt = (_Worksheet)xBk.ActiveSheet;
string a=xSt.get_Range(xSt.Cells[1, 1], xSt.Cells[1, 1]).Value2.ToString()//读取第一行第一列
xSt.Cells[1, 1]="你好";赋值给第一行第一列