. NET download File methods

1. Download the file stream

Byte[] filestr=new  byte[5];            MemoryStream Btms = new MemoryStream (FILESTR);            Download the file as a stream of characters             byte[] bytes = new byte[(int) btms.length];            Btms.read (bytes, 0, bytes. Length);            Btms.close ();            Page.Response.ContentType = "Application/octet-stream";            Notifies the browser to download the file instead of opening             Page.Response.AddHeader ("content-disposition", "attachment; Filename= "+ httputility.urlencode (filename, System.Text.Encoding.UTF8));            Page.Response.BinaryWrite (bytes);            Page.Response.Flush ();            Page.Response.End ();

2. Download according to the file path

public void Download (string path)        {            string filePath = HttpContext.Current.Server.MapPath (path);/            /path// Download the file as a stream of characters             FileStream fs = new FileStream (FilePath, FileMode.Open);            byte[] bytes = new byte[(int) fs. Length];            Fs. Read (bytes, 0, bytes. Length);            Fs. Close ();            HttpContext.Current.Response.ContentType = "Application/octet-stream";            HttpContext.Current.Response.AddHeader ("Content-disposition", "attachment; Filename= "+ httputility.urlencode (" Test ", System.Text.Encoding.UTF8));            HttpContext.Current.Response.BinaryWrite (bytes);            HttpContext.Current.Response.Flush ();            HttpContext.Current.Response.End ();        }

3. Direct download

WebClient client = new WebClient ();

File storage Path
var path = HttpContext.Current.Server.MapPath (@ "\static\btdownload\");

Determine if a file exists
var file = new FileInfo (path + filename);
if (!file. Exists)
{
Client. DownloadFile (value, path + filename);
}

. NET download File methods