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string strFileName = "ABC.xls";
string path = AppDomain.CurrentDomain.BaseDirectory + @"ABC\file\" + strFileName;//文件存放路径
FileInfo file = new FileInfo(path);
Response.Clear();
Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(file.Name));
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(file.FullName);
Response.End();
用Response.WriteFile替换Response.BinaryWrite