Add Event Handler Dynamically, but assigning function name at run-time, not to static function

[Jose Suero]

Hi all
I have a dynamically created button, I can add an event handler with:

AddHandler button.click, AddressOf static_function

This works great, but what I need is to create a function that takes
the control, the event and the function as parameters, something like:

function addevent(control as object, event as string, functionname as
string)
AddHandler control.event, addressof functionname
end function

A solution for this would be to add a single function that handles all
buttons and select the correct action thru commandarguments, that
would work, but it's really not what i'm looking for.
Thanks in advance,

Jose Suero

[Teemu Keiski]

Hi,

you cannot pass the functionname as such as AddressOf expects a delegate
type, not function name as string. You could try to use reflection as this
article explains:

http://www.123aspx.com/redir.aspx?res=31050

--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist
"Jose Suero" <[e-mail]> wrote in message
news:fd**************************@posting.google.c om...

Hi all
I have a dynamically created button, I can add an event handler with:

AddHandler button.click, AddressOf static_function

This works great, but what I need is to create a function that takes
the control, the event and the function as parameters, something like:

function addevent(control as object, event as string, functionname as
string)
AddHandler control.event, addressof functionname
end function

A solution for this would be to add a single function that handles all
buttons and select the correct action thru commandarguments, that
would work, but it's really not what i'm looking for.
Thanks in advance,

Jose Suero

[Jose Suero]

Thanks a lot for your post, It took me on the right track, I had to
change tiny things, since I was getting an error but this works for
imagebuttons, binding an event for a dynamic created object from a
class library

Public Shared Function addevent(ByVal controlname As String, ByVal
type As String, ByVal eventname As String, ByVal procedure As String)
Dim control As System.Web.UI.WebControls.ImageButton
control = page.findcontrol(controlname)
Dim p As Object
Dim DLLName As String = "projectname"
Dim asm As [Assembly] = [Assembly].Load(DLLName)
Dim t As Type = asm.GetType(DLLName & ".WebForm1", True)
p = Activator.CreateInstance(t)
Dim mymethod As MethodInfo = t.GetMethod(procedure)
' get a reference to the EventInfo for this object
Dim pEv As EventInfo = control.GetType.GetEvent(eventname)
' create a delegate to the local procedure
Dim pDel As [Delegate] =
[Delegate].CreateDelegate(pEv.EventHandlerType, mymethod)
' make the local procedure a handler for the event
pEv.AddEventHandler(control, pDel)
End Function

"Teemu Keiski" <jo****@aspalliance.com> wrote in message news:<#$**************@TK2MSFTNGP11.phx.gbl>...

Hi,

you cannot pass the functionname as such as AddressOf expects a delegate
type, not function name as string. You could try to use reflection as this
article explains:

http://www.123aspx.com/redir.aspx?res=31050

--
Teemu Keiski
MCP, Microsoft MVP (ASP.NET), AspInsiders member
ASP.NET Forum Moderator, AspAlliance Columnist
"Jose Suero" <[e-mail]> wrote in message
news:fd**************************@posting.google.c om...

Hi all
I have a dynamically created button, I can add an event handler with:

AddHandler button.click, AddressOf static_function

This works great, but what I need is to create a function that takes
the control, the event and the function as parameters, something like:

function addevent(control as object, event as string, functionname as
string)
AddHandler control.event, addressof functionname
end function

A solution for this would be to add a single function that handles all
buttons and select the correct action thru commandarguments, that
would work, but it's really not what i'm looking for.
Thanks in advance,

Jose Suero