本文介绍了如何在ASP.NET中通过使用Session变量和Server.MapPath方法来获取文件路径，并最终实现文件下载功能。通过设置HTTP响应头，确保浏览器正确解析并下载文件。
string filename = Session["file"] as string;
string path = Server.MapPath("~/files/" + filename);
if (File.Exists(path))
{
FileInfo fi = new FileInfo(path);
Response.Clear();
Response.ClearHeaders();
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8).Replace("+", "%20"));
Response.AppendHeader("Content-Length", fi.Length.ToString());
Response.WriteFile(fi.FullName);
Response.Flush();
Response.End();
}
else
{
Response.Write("文件不存在");
}
转载于:https://www.cnblogs.com/gnhao/archive/2013/01/09/2852555.html
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