ASP.NET提供檔案下載下傳函數

以下為代碼片段：

//輸出硬碟檔案，提供下載下傳支援大檔案、續傳、速度限制、資源占用小

//輸入參數_request:page.request對象，_response:page.response對象，_filename:下載下傳檔案名，_fullpath:帶檔案名下載下傳路徑，_speed每秒允許下載下傳的位元組數

//傳回是否成功

publicstaticboolresponsefile(httprequest_request,httpresponse_response,string_filename,string_fullpath,long_speed)

{

try

filestreammyfile=newfilestream(_fullpath,filemode.open,fileaccess.read,fileshare.readwrite);

binaryreaderbr=newbinaryreader(myfile);

_response.addheader("accept-ranges","bytes");

_response.buffer=false;

longfilelength=myfile.length;

longstartbytes=0;

intpack=10240;//10kbytes

//intsleep=200;//每秒5次即5*10kbytes每秒

intsleep=(int)math.floor(1000*pack/_speed)+1;

if(_request.headers["range"]!=null)

_response.statuscode=206;

string[]range=_request.headers["range"].split(newchar[]{'=','-'});

startbytes=convert.toint64(range[1]);

}

_response.addheader("content-length",(filelength-startbytes).tostring());

if(startbytes!=0)

_response.addheader("content-range",string.format("bytes{0}-{1}/{2}",startbytes,filelength-1,filelength));

_response.addheader("connection","keep-alive");

_response.contenttype="application/octet-stream";

_response.addheader("content-disposition","attachment;filename="+httputility.urlencode(_filename,system.text.encoding.utf8));

br.basestream.seek(startbytes,seekorigin.begin);

intmaxcount=(int)math.floor((filelength-startbytes)/pack)+1;

for(inti=0;i<maxcount;i++)

if(_response.isclientconnected)

_response.binarywrite(br.readbytes(pack));

thread.sleep(sleep);

else

i=maxcount;

catch

returnfalse;

finally

br.close();

myfile.close();

returntrue;

調用例

page.response.clear();

boolsuccess=responsefile(page.request,page.response,"filename",@"c:/download.date",1024000);

if(!success)

response.write("下載下傳檔案出錯！");

page.response.end();