方法一：
public void ToExcel(){
//第一步：获取模版物理路径
string file_1 = Server.MapPath("/Content/Excel/downExcel.xls");
//第二步： 写入客户端
System.IO.FileInfo filet = new System.IO.FileInfo(file_1);
Response.Clear();
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
// 添加头信息，为"文件下载/另存为"对话框指定默认文件名
if (file_0.IndexOf(".xlsx") > 0){
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("订单详情.xlsx"));
}
else if (file_0.IndexOf(".xls") > 0){
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("订单详情.xls"));
}
// 添加头信息，指定文件大小，让浏览器能够显示下载进度
Response.AddHeader("Content-Length", filet.Length.ToString());
// 指定返回的是一个不能被客户端读取的流，必须被下载
Response.ContentType = "application/ms-excel";
// 把文件流发送到客户端
Response.WriteFile(filet.FullName);
// 停止页面的执行
Response.End();
}
方法二：
public void excelModel(){
//第一步：获取模版物理路径
string path= Server.MapPath("/Content/Excel/downExcel.xls");
//第二步：写入客户端
FileStream fs = new FileStream(path, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.Charset = "UTF-8";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
return new EmptyResult();
}