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Files are saved to the database as binary streams and downloaded.

Source: Internet
Author: User
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An internal email was sent and received last week, and attachments are supported ,,
In order to do a good job in this attachment, I did find a lot of information and asked a lot of people for help. Now I am posting the code for discussion and improvement, so as to facilitate those who need it,

Table Structure table name myfile: ID, files (image), type (varchar (50)

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Using system;
Using system. Data;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;

Using system. Data. sqlclient;
Using system. IO;

Public partial class image: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
}
Protected void button#click (Object sender, eventargs E)
{

Stream filedatastream = fileupload1.postedfile. inputstream;

Httppostedfile file = fileupload1.postedfile;
Int filelength = fileupload1.postedfile. contentlength;

Byte [] filedata = new byte [filelength];
Filedatastream. Read (filedata, 0, filelength); // fill the file stream in the array

String filetype = path. getextension (fileupload1.postedfile. filename); // get the file extension

Sqlconnection Cn = new sqlconnection (configurationmanager. appsettings ["dbconnectionstring"]. tostring ());
CN. open ();

Sqlcommand cmd = new sqlcommand ("insert myfile (files, type) values (@ files, @ type)", CN );
Cmd. Parameters. addwithvalue ("@ Files", filedata );
Cmd. Parameters. addwithvalue ("@ Type", filetype );
Cmd. executenonquery ();
CN. Close ();
}
}
<Head runat = "server">
<Title> upload a file to the database </title>
</Head>
<Body>
<Form ID = "form1" runat = "server" enctype = "multipart/form-Data">
<Div>
<Asp: fileupload id = "fileupload1" runat = "server"/>
<Asp: button id = "button1" runat = "server" text = "button" onclick = "button#click"/> </div>
</Form>
</Body>

Download

Using system;
Using system. Data;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;

Using system. Data. sqlclient;
Using system. IO;

Public partial class image2: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
Sqlconnection Cn = new sqlconnection ("Server =.; uid = sa; Pwd = sa; database = test;"); // Database Link
CN. open ();

Sqldataadapter da2 = new sqldataadapter ("select * From myfile where id = 24", CN); // read 5th data records from the warehouse
Dataset ds2 = new dataset ();
Da2.fill (DS2 );
Byte [] b2 = (byte []) ds2.tables [0]. Rows [0] ["Files"];
String type = (string) ds2.tables [0]. Rows [0] ["type"];

Response. Clear ();
String type = checktype (type );
Response. addheader ("content-disposition", "attachment; filename = ABC" + type );

Response. addheader ("Content-Length", b2.length. tostring ());
Response. contenttype = type;

Response. binarywrite (B2 );
Response. End ();

String filename = (linkbutton) sender). commandargument;
Response. Clear ();
Response. contenttype = type;
Response. addheader ("content-disposition", "attachment; filename =" + httputility. urlencode (filename, system. Text. encoding. utf8 ));
Response. writefile (filename );
Response. End ();
}
Private string checktype (string filename)
{
String contenttype;
Switch (filename. substring (filename. lastindexof ("."). Trim (). tolower ())
{
Case ". ASF ":
Contenttype = "Video/X-MS-ASF ";
Break;
Case ". Avi ":
Contenttype = "Video/Avi ";
Break;
Case ". Doc ":
Contenttype = "application/MSWord"; break;
Case ". Zip ":
Contenttype = "application/zip"; break;
Case ". xls ":
Contenttype = "application/vnd. MS-excel"; break;
Case ". GIF ":
Contenttype = "image/GIF"; break;
Case ". jpg ":
Contenttype = "image/JPEG"; break;
Case "Jpeg ":
Contenttype = "image/JPEG"; break;
Case ". wav ":
Contenttype = "audio/WAV"; break;
Case ". MP3 ":
Contenttype = "audio/mpeg3"; break;
Case ". mpg ":
Contenttype = "Video/MPEG"; break;
Case ". mepg ":
Contenttype = "Video/MPEG"; break;
Case ". rtf ":
Contenttype = "application/rtf"; break;
Case ". html ":
Contenttype = "text/html"; break;
Case ". htm ":
Contenttype = "text/html"; break;
Case ". txt ":
Contenttype = "text/plain"; break;
Default:
Contenttype = "application/octet-stream ";
Break;
}
Return contenttype;
}
}
 

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Related Keywords:
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