"Sergio E." <gruporemp[ARROBA]hotmail.com> wrote in message
news:epgAdRq4HHA.5880@TK2MSFTNGP03.phx.gbl...
> Hello, I am extending a webcontrol, and I need to generate an array of
> objects of type dropdownlist, whose event selectedindexchanged must fires
> an own method called Cbo_SelectedIndexChanged that has the same signature
> of selectedindexchanged of a normal dropdownlist. I already tried to add
> the handler to them with addhandler but the event does not go off. I
> already debug it line by line and the first timethe page with the control
> draws correctly, dropdownlists fill correctly but when changing some value
> of any of them it does not work, the method never is reached. I don't know
> if it is because I don't defined the withevents modifier for each
> dropdownlist, but the compiler gives me an error if I do "protected
> withevents cbos() as dropdownlist" and I don't know how add to it when
> it's in an array.
>
> The source code involved is this:
>
> public class myExtendedPanel
> inherits panel
> protected cbos() as dropdownlist
>
> private sub GenerateCbos(byval maxcbos as integer)
> redim me.cbos(0 to maxcbos)
> for i as integer = 0 to maxcbos
> me.cbos(i) = new dropdownlist()
> me.cbos(i).id="LocalCbo"+i.tostring()
> me.cbos(i).datasource = me.dts(i)
> me.cbos(i).datatextfield="colText"
> me.cbos(i).datavaluefield="colId"
> me.cbos(i).autopostback=true
> me.cbos(i).enableviewstate=true
> Dim eh As EventHandler = New EventHandler(AddressOf
> Me.Cbo_SelectedIndexChanged)
> AddHandler Me.ddls(i).SelectedIndexChanged, eh
> 'AddHandler ddl.SelectedIndexChanged, AddressOf
> Me.Cbo_SelectedIndexChanged ' it don't work too
> me.cbos(i).databind()
> me.cbos(i).selectedvalue=me.selvals(i)
> me.controls.add(me.cbos(i))
> next
> end sub
>
>
> Protected Sub Cbo_SelectedIndexChanged(ByVal sender As Object, ByVal e As
> EventArgs)
> 'Here goes the code to execute, by now i use a test
> response.write(me.cbos(0).selectedvalue)
> 'this method hasn't reached
> end sub
> end class
>
>
> What I'm doing wrong?
> Thank you!
> --
> Greetings,
> Sergio E.
>
>
>

> One thing that I am noticing is that you do not declare Me.ddls anywhere
> (the object you use in the AddHandler statement). Also, it looks to me
> like you are not very experienced in writing custom controls; by this I am
> referring to the fact that you are not overriding the methods defined in
> the WebControl class that are normally overridden in custom controls. For
> example, CreateChildControls. For more information see the documentation.
> Also, a great book with plenty of simple yet complete examples that are
> explained in much detail is ASP.NET 2.0 Unleashed by Stephen Walther:
>
> http://www.amazon.com/ASP-NET-2-0-Unleashed-Stephen-Walther/dp/0672328232/ref=sr_11_1/103-3352937-2405450?ie=UTF8&qid=1189389819&sr=11-1
>
> Another suggestion of mine, based on your code, would be to not inherit
> from the Panel control, but from the WebControl. Assuming you are not
> using any of the capabilities unique to the Panel, your control may be
> more efficient if you inherit from WebControl. Good Luck!
> --
> Nathan Sokalski
> njsokalski@hotmail.com
> http://www.nathansokalski.com/
>
> "Sergio E." <gruporemp[ARROBA]hotmail.com> wrote in message
> news:epgAdRq4HHA.5880@TK2MSFTNGP03.phx.gbl...
>> Hello, I am extending a webcontrol, and I need to generate an array of
>> objects of type dropdownlist, whose event selectedindexchanged must fires
>> an own method called Cbo_SelectedIndexChanged that has the same signature
>> of selectedindexchanged of a normal dropdownlist. I already tried to add
>> the handler to them with addhandler but the event does not go off. I
>> already debug it line by line and the first timethe page with the control
>> draws correctly, dropdownlists fill correctly but when changing some
>> value of any of them it does not work, the method never is reached. I
>> don't know if it is because I don't defined the withevents modifier for
>> each dropdownlist, but the compiler gives me an error if I do "protected
>> withevents cbos() as dropdownlist" and I don't know how add to it when
>> it's in an array.
>>
>> The source code involved is this:
>>
>> public class myExtendedPanel
>> inherits panel
>> protected cbos() as dropdownlist
>>
>> private sub GenerateCbos(byval maxcbos as integer)
>> redim me.cbos(0 to maxcbos)
>> for i as integer = 0 to maxcbos
>> me.cbos(i) = new dropdownlist()
>> me.cbos(i).id="LocalCbo"+i.tostring()
>> me.cbos(i).datasource = me.dts(i)
>> me.cbos(i).datatextfield="colText"
>> me.cbos(i).datavaluefield="colId"
>> me.cbos(i).autopostback=true
>> me.cbos(i).enableviewstate=true
>> Dim eh As EventHandler = New EventHandler(AddressOf
>> Me.Cbo_SelectedIndexChanged)
>> AddHandler Me.ddls(i).SelectedIndexChanged, eh
>> 'AddHandler ddl.SelectedIndexChanged, AddressOf
>> Me.Cbo_SelectedIndexChanged ' it don't work too
>> me.cbos(i).databind()
>> me.cbos(i).selectedvalue=me.selvals(i)
>> me.controls.add(me.cbos(i))
>> next
>> end sub
>>
>>
>> Protected Sub Cbo_SelectedIndexChanged(ByVal sender As Object, ByVal e As
>> EventArgs)
>> 'Here goes the code to execute, by now i use a test
>> response.write(me.cbos(0).selectedvalue)
>> 'this method hasn't reached
>> end sub
>> end class
>>
>>
>> What I'm doing wrong?
>> Thank you!
>> --
>> Greetings,
>> Sergio E.
>>
>>
>>
>
>