.net 文件下载方法

public void DownLoadMethod(string FilePath)
{
string hzm = Path.GetExtension(FilePath).ToLower();
string FileName = Path.GetFileNameWithoutExtension(FilePath);
string Name = FileName + hzm;
if (hzm.ToLower() == ".pdf")
{
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".jpeg" || hzm.ToLower() == ".jpg")
{
Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".gif")
{
Response.ContentType = "image/GIF";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".doc" || hzm.ToLower() == "rtf" || hzm.ToLower() == ".docx")
{
Response.ContentType = "Application/msword";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".xls" || hzm.ToLower() == ".xlsx")
{
Response.ContentType = "Application/x-msexcel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".txt")
{
Response.ContentType = "text/plain";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
if (hzm.ToLower() == ".htm" || hzm.ToLower() == ".html")
{
Response.ContentType = "text/HTML";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.TransmitFile(Server.MapPath(FilePath));
}
else
{
if (hzm.ToLower() == ".zip")
{
//以字符流的形式下载文件
FileStream fs = new FileStream(Server.MapPath(FilePath), FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.ContentType = "application/octet-stream";
//通知浏览器下载文件而不是打开
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Name, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
}
}

//下载 压缩文件 *.zip

private void DownloadFiles(string url)
{
if (url.Equals(""))
{
return;
}
try
{
if (!File.Exists(Server.MapPath(url)))
{
return;
}
FileInfo fi = new FileInfo(Server.MapPath(url));
Response.Clear();
Response.ContentType = "application/octet-stream";
string fileName = fi.FullName.Substring(fi.FullName.LastIndexOf("\\") + 1);
if (fileName.Length > 32 && fileName.Split('-').Length >= 5)
{
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fi.FullName.Substring(fi.FullName.LastIndexOf("\\") + 1).Substring(fi.FullName.Substring(fi.FullName.LastIndexOf("\\") + 1).IndexOf('_') + 1), System.Text.Encoding.UTF8));
}
else
{
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fi.FullName.Substring(fi.FullName.LastIndexOf("\\") + 1), System.Text.Encoding.UTF8));
}
Response.AppendHeader("Content-Length", fi.Length.ToString());
Response.WriteFile(fi.FullName);
Response.Flush();
Response.End();
}
catch (FileNotFoundException ex)
{
Response.Write(ex.Message);
}
}