文件附件在服务器上存储的文件名格式是:20151027092756201_上传的文件名 (年月日分秒毫秒_)
要求点击下载去掉前面包括下划线的18个字符
protected void NormalDownload(string normalFileName)
{
FileStream fs = File.OpenRead(normalFileName);
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
fs.Close();
Response.AddHeader("content-disposition", "attachment;filename=" + Regex.Replace(new FileInfo(normalFileName).Name, @"\d{17}_", ""));
Response.BinaryWrite(buffer);
Response.Flush();
Response.End();
}