?1//?輸出硬盤文件，提供下載?支持大文件、續傳、速度限制、資源占用小
?2????????//?輸入參數?_Request:?Page.Request對象，??_Response:?Page.Response對象，?_fileName:?下載文件名，?_fullPath:?帶文件名下載路徑，?_speed?每秒允許下載的字節數
?3????????//?返回是否成功
?4????????public?static?bool?ResponseFile(HttpRequest?_Request,HttpResponse?_Response,string?_fileName,string?_fullPath,?long?_speed)
?5????????{
?6????????????try
?7????????????{
?8????????????????FileStream?myFile?=?new?FileStream(_fullPath,?FileMode.Open,?FileAccess.Read,?FileShare.ReadWrite);
?9????????????????BinaryReader?br?=?new?BinaryReader(myFile);
10????????????????try
11????????????????{
12????????????????????_Response.AddHeader("Accept-Ranges",?"bytes");
13????????????????????_Response.Buffer?=?false;
14????????????????????long?fileLength?=?myFile.Length;
15????????????????????long?startBytes?=?0;
16?????
17????????????????????int?pack?=?102400;?//10K?bytes
18????????????????????//int?sleep?=?200;???//每秒5次???即5*10K?bytes每秒
19????????????????????int?sleep?=?(int)Math.Floor(1000?*?pack?/?_speed)?+?1;
20????????????????????if?(_Request.Headers["Range"]?!=?null)
21????????????????????{
22????????????????????????_Response.StatusCode?=?206;
23????????????????????????string[]?range?=?_Request.Headers["Range"].Split(new?char[]?{'=',?'-'});
24????????????????????????startBytes?=?Convert.ToInt64(range[1]);
25????????????????????}
26????????????????????_Response.AddHeader("Content-Length",?(fileLength?-?startBytes).ToString());
27????????????????????if?(startBytes?!=?0)
28????????????????????{
29????????????????????????_Response.AddHeader("Content-Range",?string.Format("?bytes?{0}-{1}/{2}",?startBytes,?fileLength-1,?fileLength));
30????????????????????}
31????????????????????_Response.AddHeader("Connection",?"Keep-Alive");
32????????????????????_Response.ContentType?=?"application/octet-stream";
33????????????????????_Response.AddHeader("Content-Disposition","attachment;filename="?+?HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8)?);
34?
35????????????????????br.BaseStream.Seek(startBytes,?SeekOrigin.Begin);
36????????????????????int?maxCount?=?(int)?Math.Floor((fileLength?-?startBytes)?/?pack)?+?1;
37
38????????????????????for?(int?i?=?0;?i?<?maxCount;?i++)
39????????????????????{
40????????????????????????if?(_Response.IsClientConnected)
41????????????????????????{
42????????????????????????????_Response.BinaryWrite(br.ReadBytes(pack));
43????????????????????????????Thread.Sleep(sleep);
44????????????????????????}
45????????????????????????else
46????????????????????????{
47????????????????????????????i=maxCount;?
48????????????????????????}
49????????????????????}
50????????????????}
51????????????????catch
52????????????????{
53????????????????????return?false;
54????????????????}
55????????????????finally
56????????????????{
57????????????????????br.Close();
58????????????????????myFile.Close();
59????????????????}
60????????????}
61????????????catch
62????????????{
63????????????????return?false;
64????????????}
65????????????return?true;
66????????}

轉載于:https://www.cnblogs.com/bluesky4485/archive/2008/03/28/1127823.html

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