二进制流方式打开或下载文件

[asp]代码库

 public void Open(string FileName)
    {
        string FullFileName = "";
        try
        {
            FullFileName = FileName; //文件物理路径
            FileInfo DownloadFile = new FileInfo(FullFileName);//文件流
            if (DownloadFile.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                Response.ContentType = "application/octet-stream";
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));//filename设置文件的名称
                Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                Response.WriteFile(DownloadFile.FullName);
                Response.Flush();
                Response.End();
            }
        }
        catch
        {
            //打开时异常了
        }

    }