由于excel格式比较复杂，所以用到了模板，每次导出的时候先把模板复制一份到一个新的目录下，然后进行填充，再下载。
C# code:
_Worksheet sheet1 = null;//sheet1
//判断是否复制成功：对模板进行复制，然后保存到一个新的目录下，再下载
string m_newPath = change(System.Configuration.ConfigurationManager.AppSettings["oldPath"] + "customer2.xls", filename);
if (string.IsNullOrEmpty(m_newPath))
{
return;
}
object missing = Missing.Value;
Microsoft.Office.Interop.Excel.Application myExcel = new Microsoft.Office.Interop.Excel.Application();
//打开新文件
myExcel.Application.Workbooks.Open(m_newPath, missing, missing, missing, missing,
missing, missing, missing, missing, missing, missing, missing, missing, missing, missing);
//将Excel显示出来
myExcel.Visible = true;
//将列标题和实际内容选中
Microsoft.Office.Interop.Excel.Workbook myBook = myExcel.Workbooks[1];
sheet1 = (_Worksheet)myExcel.Worksheets[1];
sheet1.Cells[1, 1] = “”；
。。。。。。
myBook.Save();
myBook.Close(missing, missing, missing);
myExcel.Quit();
myExcel = null;
myBook = null;
sheet1 = null;
