Custom HTTP processing program display image (Asp.net 2.0)

Custom HTTP ProcessingProgramThat is, the HTTP handler must implement the interface system. Web. ihttphandler.
When implementing the ihttphandler interface, you must do two things: Setting the isreusable attribute and implementing the processrequest () method.
Create generic handler.

<% @ Webhandler Language = "C #" class = "handler" %>

Using system;
Using system. IO;
Using system. Web;

Public class handler: ihttphandler {

Public bool isreusable {
Get {
Return true;
}
}

Public void processrequest (httpcontext context ){
// Set up the response settings
Context. response. contenttype = "image/JPEG ";
Context. response. cache. setcacheability (httpcacheability. Public );
Context. response. bufferoutput = false;
// Setup the size parameter
Photosize size;
Switch (context. Request. querystring ["size"]) {
Case "S ":
Size = photosize. Small;
Break;
Case "M ":
Size = photosize. medium;
Break;
Case "L ":
Size = photosize. Large;
Break;
Default:
Size = photosize. Original;
Break;
}
// Setup the photoid Parameter
Int32 id =-1;
Stream stream = NULL;
If (context. Request. querystring ["photoid"]! = NULL & context. Request. querystring ["photoid"]! = ""){
Id = convert. toint32 (context. Request. querystring ["photoid"]);
Stream = photomanager. getphoto (ID, size );
} Else {
Id = convert. toint32 (context. Request. querystring ["albumid"]);
Stream = photomanager. getfirstphoto (ID, size );
}
// Get the photo from the database, if nothing is returned, get the default "Placeholder" photo
If (Stream = NULL) stream = photomanager. getphoto (size );
// Write image stream to the response stream
Const int buffersize = 1024*16;
Byte [] buffer = new byte [buffersize];
Int COUNT = stream. Read (buffer, 0, buffersize );
While (count> 0 ){
Context. response. outputstream. Write (buffer, 0, count );
Count = stream. Read (buffer, 0, buffersize );
}
}

}

Public static stream getphoto (INT photoid, photosize size ){
Using (sqlconnection connection = new sqlconnection (configurationmanager. connectionstrings ["personal"]. connectionstring )){
Using (sqlcommand command = new sqlcommand ("getphoto", connection )){
Command. commandtype = commandtype. storedprocedure;
Command. Parameters. Add (New sqlparameter ("@ photoid", photoid ));
Command. Parameters. Add (New sqlparameter ("@ size", (INT) size ));
Bool filter =! (Httpcontext. Current. User. isinrole ("friends") | httpcontext. Current. User. isinrole ("Administrators "));
Command. Parameters. Add (New sqlparameter ("@ ispublic", filter ));
Connection. open ();
Object result = command. executescalar ();
Try {
Return new memorystream (byte []) result );
} Catch {
Return NULL;
}
}
}
}

Public static stream getfirstphoto (INT albumid, photosize size ){
Using (sqlconnection connection = new sqlconnection (configurationmanager. connectionstrings ["personal"]. connectionstring )){
Using (sqlcommand command = new sqlcommand ("getfirstphoto", connection )){
Command. commandtype = commandtype. storedprocedure;
Command. Parameters. Add (New sqlparameter ("@ albumid", albumid ));
Command. Parameters. Add (New sqlparameter ("@ size", (INT) size ));
Bool filter =! (Httpcontext. Current. User. isinrole ("friends") | httpcontext. Current. User. isinrole ("Administrators "));
Command. Parameters. Add (New sqlparameter ("@ ispublic", filter ));
Connection. open ();
Object result = command. executescalar ();
Try {
Return new memorystream (byte []) result );
} Catch {
Return NULL;
}
}
}
}