Asp.net File Download Methods

 

Several common download methods for asp.net are as follows. You can add

 

<Iframe id = "iDownload" style = "display: none;"> </iframe>

 

Then, use the jquery statement to specify the download link.

 

$ ("# IDownload"). attr ("src", "download. ashx? Filename = "+ encodeURI ($ (this). children (" span "). first (). text ()));

 

 

 

Protected void button#click (object sender, EventArgs e)

{

/*

Microsoft provides a new TransmitFile method for the Response object to solve the problem of using Response. BinaryWrite

When a file with more than Mbit/s is downloaded, The aspnet_wp.exe process cannot be recycled.

The Code is as follows:

*/

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)

{

/*

Using System. IO;

*/

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 & gt; 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 ();

}

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