Instance code of the file download function in asp.net

Copy codeThe Code is as follows:
// Download TransmitFile
Protected void button#click (object sender, EventArgs e)
{

Response. ContentType = "application/x-zip-compressed ";
Response. AddHeader ("Content-Disposition", "attachment?filename=z.zip ");
String filename = Server. MapPath ("DownLoad/aaa.zip ");
Response. TransmitFile (filename );
}

// Download WriteFile
Protected void Button2_Click (object sender, EventArgs e)
{

String fileName = "aaa.zip"; // file name saved by the client
String filePath = Server. MapPath ("DownLoad/aaa.zip"); // 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 multipart download
Protected void Button3_Click (object sender, EventArgs e)
{

String fileName = "aaa.zip"; // file name saved by the client
String filePath = Server. MapPath ("DownLoad/aaa.zip"); // path

System. IO. FileInfo fileInfo = new System. IO. FileInfo (filePath );

If (fileInfo. Exists = true)
{
Const long ChunkSize = 102400; // 100 K reads only 100 K each time, which can relieve the pressure on the server
Byte [] buffer = new byte [ChunkSize];

Response. Clear ();
System. IO. FileStream iStream = System. IO. File. OpenRead (filePath );
Long dataLengthToRead = iStream. Length; // obtain 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 download
Protected void Button4_Click (object sender, EventArgs e)
{
String fileName = "aaa.zip"; // file name saved by the client
String filePath = Server. MapPath ("DownLoad/aaa.zip"); // path

// Download an object in the form of a streaming
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 ";
// Notify the browser to download the 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 ();

}