. net file Download method rollup

Reprinted from: http://blog.sina.com.cn/s/blog_680942070101ahsq.html

Test pass, compatible with IE, Google:

stringPath = Server.MapPath ("~/upload"+ Bill. AttachmentPath + Bill. AttachmentName);//Attachment Save Path if(file.exists (path)) {//download a file as a stream of charactersFileStream fs =NewFileStream (path, FileMode.Open); byte[] bytes =New byte[(int) fs.                Length]; Fs. Read (Bytes,0, Bytes.                Length); Fs.                Close (); Response.ContentType="Application/octet-stream"; //notifies the browser to download a file instead of opening it stringfilename =Bill.                Realname; if(Request.UserAgent.IndexOf ("MSIE") >-1) {filename=System.Web.HttpUtility.UrlEncode (filename, System.Text.Encoding.UTF8); } Response.AddHeader ("content-disposition","attachment; Filename="+httputility.urlencode (filename, System.Text.Encoding.UTF8));                Response.BinaryWrite (bytes);                Response.Flush ();            Response.End (); }

TransmitFile implementation Download

protected void Button1_click1 (object sender, EventArgs e)

{

String strFileName = "Three idle device management system operating manual iems.ppt";

Response.ContentType = "application/x-zip-compressed";

response.contentencoding = System.Text.Encoding.GetEncoding ("gb2312");

string filename = BLL. Config.part_em_upload_doc + strFileName;

Bll. Config.part_em_upload_doc as Path ("d:/emuploaddoc/")

Response.AddHeader ("Content-disposition", "Attachment;filename=" +server.urlpathencode (strFileName));

server.urlpathencode () resolves the file name garbled problem.

Response.TransmitFile (filename);

}//writefile Implementation Download

protected void button2_click (object sender, EventArgs e)

{

string filename = "Asd.txt";//file name saved by the client

String filePath = Server.MapPath ("Download/aaa.txt");//path

FileInfo FileInfo = new FileInfo (FilePath);

Response.Clear ();

Response.clearcontent ();

Response.ClearHeaders ();

Response.AddHeader ("Content-disposition", "attachment;filename=" + filename);

Response.AddHeader ("Content-length", fileInfo.Length.ToString ());

Response.AddHeader ("content-transfer-encoding", "binary");

Response.ContentType = "Application/octet-stream";

response.contentencoding = System.Text.Encoding.GetEncoding ("gb2312");

Response.WriteFile (Fileinfo.fullname);

Response.Flush ();

Response.End ();

}

WriteFile Sub-block download

protected void Button3_Click (object sender, EventArgs e)

{

string filename = "Aaa.txt";//file name saved by the client

String filePath = Server.MapPath ("Download/aaa.txt");//path

System.IO.FileInfo FileInfo = new System.IO.FileInfo (FilePath);

if (fileinfo.exists = = True)

{

Const LONG ChunkSize = 102400;//100k reads the file each time, only reads 100K, this can alleviate the pressure of the server

byte[] buffer = new Byte[chunksize];

Response.Clear ();

System.IO.FileStream IStream = System.IO.File.OpenRead (FilePath);

Long Datalengthtoread = istream.length;//Gets the total size of the downloaded file

Response.ContentType = "Application/octet-stream";

Response.AddHeader ("Content-disposition", "attachment; Filename= "+ httputility.urlencode (fileName));

while (Datalengthtoread > 0 && response.isclientconnected)

{

int lengthread = istream.read (buffer, 0, Convert.ToInt32 (ChunkSize));//Read size

Response.OutputStream.Write (buffer, 0, lengthread);

Response.Flush ();

Datalengthtoread = Datalengthtoread-lengthread;

}

Response.close ();

}

}

Stream mode Download

protected void Button4_Click (object sender, EventArgs e)

{

string filename = "Aaa.txt";//file name saved by the client

String filePath = Server.MapPath ("Download/aaa.txt");//path

Download a 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 ();

Response.ContentType = "Application/octet-stream";

Notifies the browser to download a file instead of opening it

Response.AddHeader ("Content-disposition", "attachment; Filename= "+ httputility.urlencode (FileName, System.Text.Encoding.UTF8));

Response.BinaryWrite (bytes);

Response.Flush ();

Response.End ();

}

C#:
///
File download
///
///
private void FileDownload (string fullfilename)
{
FileInfo DownloadFile = new FileInfo (fullfilename);
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));
Response.appendheader ("Content-length", DownloadFile.Length.ToString ());
Response.WriteFile (Downloadfile.fullname);
Response.Flush ();
Response.End ();
}

File read/write
Public Stream GetFileStream (string filename)
{//File address
Uri Fileuri = new uri (filename, urikind.relative);
Save
StreamResourceInfo info = new StreamResourceInfo (this.stream, NULL);
if (This.stream is System.IO.FileStream)
{
This.stream.Seek (0, Seekorigin.begin);
}
StreamResourceInfo stream = System.Windows.Application.GetResourceStream (info, Fileuri);
if (stream! = null)
{
return stream. Stream;
}
return null;
}
Public IEnumerable Getfilenamesinzip ()
{
BinaryReader reader = new BinaryReader (stream);
Stream. Seek (0, Seekorigin.begin);
string name = NULL;
List names = new list ();
while (Parsefileheader (reader, out name))
{
Names. ADD (name);
}
return names;
}
private static bool Parsefileheader (BinaryReader Reader, out string filename)
{
filename = null;
if (reader. Basestream.position < reader. Basestream.length)
{
filename = null;
if (reader. Basestream.position < reader. Basestream.length)
{
Reader. Basestream.seek (2, seekorigin.current);
Short Genpurposeflag = reader. ReadInt16 ();
if ((((((int) genpurposeflag) & 0x08)! = 0))
return false;
Reader. Basestream.seek (ten, seekorigin.current);
int compressedsize = reader. ReadInt32 ();
int uncompressedsize = reader. ReadInt32 ();
Short filenamelenght = reader. ReadInt16 ();
Short extrafieldlenght = reader. ReadInt16 ();
filename = new string (reader. ReadChars (filenamelenght));
if (string. IsNullOrEmpty (filename))
return false;
Reader.                    Basestream.seek (Extrafieldlenght + compressedsize, seekorigin.current); if (uncompressedsize = = 0) return Parsefileheader (reader, out filename);
Else
return true;
}
}
return false;
}

. net file Download method rollup