Asp.net File Download

Multi-thread resumable upload

 

1 Public   Bool Responsedownload ( String Path ){
2 Long Filelength;
3 Long Startrange =   0 ;
4 Int Pack =   10240 ; // 10 K
5 String Filename = Path. getfilename (PATH );
6 Try {
7 Filestream dstream =   New Filestream (path, filemode. Open, fileaccess. Read );
8 Byte [] Buffer =   New   Byte [Pack];
9 // Binaryreader BR = new binaryreader (dstream );
10 Try {
11 Page. response. Clear ();
12 Response. Buffer =   False ;
13 Response. addheader ( " Accept-ranges " , " Bytes " );
14
15 Filelength = Dstream. length;
16 Long SP =   0 ;
17 Long EP =   0 ;
18 If (Request. headers [ " Range " ] ! =   Null ){
19 Response. statuscode =   206 ;
20 String [] Range = Request. headers [ " Range " ]. Split ( New   Char [] { ' = ' , ' - ' });
21 If (Range. Length =   3 &&! String . Isnullorempty (range [ 2 ]) {
22 EP = Convert. toint64 (range [ 2 ]);
23 }
24 SP = Convert. toint64 (range [ 1 ]);
25 If (Ep < SP ){
26 EP =   0 ;
27 }
28 }
29 Long Contlength = EP =   0   ? Filelength - SP: EP - SP +   1 ;
30
31 If (SP ! =   0 ){
32 Response. addheader ( " Content-Range " , String. Format ( " Bytes {0}-{1}/{2} " , SP, EP =   0   ? Filelength -   1 : EP, filelength ));
33 }
34
35 Response. addheader ( " Content-Length " , Contlength. tostring ());
36 Response. addheader ( " Content-Disposition " , " Attachment; filename = "   + System. Web. httputility. urlencode (filename, system. Text. encoding. utf8 ));
37 Response. addheader ( " Connection " , " Keep-alive " );
38 Response. contenttype =   " Application/octest-stream " ;
39 Response. Flush ();
40
41 // Calculate file size;
42 Long Maxcount = EP = 0 ? Filelength: EP + 1 ;
43
44 Maxcount = Maxcount - SP;
45
46 // Move file handler to range point.
47 Dstream. Seek (SP, seekorigin. Begin );
48
49 While (Maxcount >   0 && Response. isclientconnected ){
50 Int Lengthread = Dstream. Read (buffer, 0 , Convert. toint32 (pack ));
51 Response. outputstream. Write (buffer, 0 , Lengthread );
52 Response. Flush ();
53 Maxcount -= Pack;
54 }
55
56 }
57 Catch (Exception e ){
58 Response. Write ( " <H3> error: "   + E. Message );
59 Return   False ;
60 }
61 Finally {
62 Dstream. Close ();
63 }
64
65 }
66 Catch (Exception ex ){
67 Response. Write ( " <H3> error: "   + Ex. Message );
68 Return   False ;
69 }
70 Return   True ;
71 }