C # extjs images and attachments are stored in the database in binary format. images are displayed and attachments are downloaded.

Page

<Ext: fileupload runat = "  Server  " Label = "  Attachment  " Id = "  Attachment  " Width = "  200px  " > </Ext: fileupload> <Ext: fileupload runat = "  Server " Label = "  Photo  " Id = "  Photo  " Width = "  200px  " > </Ext: fileupload>

Add background attachments

 If (System. Io. Path. getextension (attachment. filename). tolower ()! = Null & Amp; system. Io. Path. getextension (attachment. filename). tolower ()! =""  ){  String Attachmentname = System. Io. Path. getfilename (attachment. filename );  String Fileattachment = System. Io. Path. getextension (attachment. filename). tolower ();  String [] Allowattachment = { "  . Jpg  " , "  . Gif  " ,"  . Docx  " , "  . Pptx  " , "  . Txt  " , "  . XSL  " , "  . Rar  " , "  . Doc " , "  . Zip  " , "  . PNG  " , "  . JPEG  " , "  . BMP  "  };  Bool BL = False ;  For ( Int I = 0 ; I <allowattachment. length; I ++ ){  If (Fileattachment = Allowattachment [I]) {BL = True  ;  Break  ;}}  If (!BL) {alert. showintop (  "  Upload an attachment in the correct format  "  );  Return  ;}  Int Attachmentlength = attachment. postedfile. contentlength; //  Body Size Byte [] filebytearrayatt = New Byte [attachmentlength]; //  Temporary storage of byte Arrays for image files Stream streamobjectatt = attachment. postedfile. inputstream; //  Create a data stream object  //  Reads image file data. filebytearray is the data storage body, 0 is the Data Pointer position, and filelne is the data length. Streamobjectatt. Read (filebytearrayatt, 0 , Attachmentlength ); //  Read the data from the 0th-Bit Array to the length of the array into the streamobjectatt. Hrmsfile. Attachment = Filebytearrayatt; hrmsfile. attachmentformat = Attachmentname;} // then save the new entity hrmsfile to the database. 

Attachment Download Page

 
<Table> <tr> <TD> <strong> Appendix: </strong> </TD> <a href ="Fujianxiazhai. ashx? Id = <% # eval ("ID") %>"> <% # Eval ("Attachmentformat") %> </A> </TD> </tr> </table>
 

Fujianxiazhai. ashx page

  String Id = context. Request. querystring [ " ID  "  ]; Hdqy. hdqyms. Business. mshrms. hrms_filebll BLL = New  Hdqy. hdqyms. Business. mshrms. hrms_filebll (); hdqy. hdqyms. entity. hrmsfile Ra = Bll. gethrmsfilebyid (ID );  If (Ra! = Null & RA. Attachment! = Null  ) {Context. response. Clear ();  String Strfilename =RA. attachmentformat; context. response. contenttype = "  Application/OCTET-STREAM  "  ; Context. response. addheader (  "  Content-Disposition  " , "  Attachment; filename =  " + Httputility. urlencode (RA. attachmentformat); context. response. Buffer = True ; Context. response. binarywrite (RA. Attachment); context. response. Flush (); context. response. Close ();} 

The photo upload and attachment are the same. The page displayed at the front-end is:

<TD rowspan ="4"Style ="Width: 100px;"> <IMG alt ="Personal photo"Height ="120px"Width ="100px"Src ='Handler. ashx? Id = <% # eval ("ID") %>'> </TD>
 

The same is to request an image from an ashx file.

 

     Public  Void  Processrequest (httpcontext context) {context. response. contenttype = "  Text/plain  "  ;  String Id = context. Request. querystring [ "  ID  "  ];  If ( String  . Isnullorempty (ID) {system. Io. filestream FS = New System. Io. filestream (system. Web. httpcontext. Current. server. mappath ( "  Http://www.cnblogs.com/icon/20111130160358207106.png  "  ), System. Io. filemode. Open, system. Io. fileaccess. Read );  Byte [] Image = New   Byte  [Fs. Length]; FS. Read (image,  0  , Image. Length); context. response. contenttype = " PNG  " ; //  Set the output file type Context. response. outputstream. Write (image, 0  , Image. Length); context. response. End ();  Return  ;} Hdqy. hdqyms. Business. mshrms. hrms_filebll BLL = New  Hdqy. hdqyms. Business. mshrms. hrms_filebll (); hdqy. hdqyms. entity. hrmsfile = Bll. gethrmsfilebyid (ID ); If (Hrmsfile! = Null & Hrmsfile. Photo! = Null & Hrmsfile. Photo. length! = 0  ) {Context. response. contenttype = Hrmsfile. photoformat; //  Set the output file type Context. response. outputstream. Write (hrmsfile. photo, 0  , Hrmsfile. Photo. Length); context. response. End ();}  Else {System. Io. filestream FS = New System. Io. filestream (system. Web. httpcontext. Current. server. mappath ( "  Http://www.cnblogs.com/icon/20111130160358207106.png  "  ), System. Io. filemode. Open, system. Io. fileaccess. Read );  Byte [] Image = New   Byte  [Fs. Length]; FS. Read (image,  0 , Image. Length); context. response. contenttype = "  PNG  " ; //  Set the output file type Context. response. outputstream. Write (image, 0  , Image. Length); context. response. End () ;}// the default image 20111130160358207106.png is provided when no image is available. 

Although it is better to store a path in the database, the requirements of the leaders have been fulfilled. Here, let's take a look at it first.