try
{
string filepath = context.Server.MapPath(context.Request.QueryString["filedir"].ToString() + "/" + context.Request.QueryString[0].Substring(0, 4).ToString() + "/" + context.Request.QueryString[0].ToString());
string filename = context.Request.QueryString[1].ToString();
FileInfo info = new FileInfo(filepath);
long fileSize = info.Length;
context.Response.Clear();
context.Response.ContentType = "application/x-zip-compressed";
context.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));
//不指明Content-Length用Flush的话不会显示下载进度
context.Response.AddHeader("Content-Length", fileSize.ToString());
context.Response.TransmitFile(filepath, 0, fileSize);
context.Response.Flush();
context.Response.Close();
}
catch
{ }来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/813/viewspace-3168949/ ，如需转载，请注明出处，否则将追究法律责任。
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