Event handler delegate as variable

[steve]

Hi All

I have a program which creates buttons on a form on loading from data in a
database table and connects them to an event handler as follows...

btn = New Button

btn.Text = dr("buttontext" ).ToString

btn.Visible = True

btn.Dock = DockStyle.Fill

btn.BackColor = Color.FromKnown Color(KnownColo r.InactiveCapti onText)

btn.Name = dr("buttonname" ).ToString

If dr("AddressOf" ) = "historycli ck" Then

AddHandler btn.Click, AddressOf historyClick

ElseIf dr("AddressOf" ) = "pricelevelclic k" Then

AddHandler btn.Click, AddressOf pricelevelClick

ElseIf dr("AddressOf" ) = "keyboardsclick " Then

AddHandler btn.Click, AddressOf keyboardsClick

end if

Is there any way to use a variable to link to the event handler delegate
instead of comparing the db field value as in the above code

e.g AddHandler btn.Click, AddressOf dr("AddressOf" ) (This doesn't work
obviously)



Regards

Steve

[Göran Andersson]

Re: Event handler delegate as variable

Yes, it's possible using reflection, but IMHO far too compex for
something trivial like this.

You can use a Select Case statement to make your code a bit more
managable. Something like this:

Select Case dr("AddressOf" )
Case "historycli ck": AddHandler btn.Click, AddressOf historyClick
Case "pricelevelclic k": AddHandler btn.Click, AddressOf pricelevelClick
Case "keyboardsclick ": AddHandler btn.Click, AddressOf keyboardsClick
End Select

steve wrote:[color=blue]
> Hi All
>
> I have a program which creates buttons on a form on loading from data in a
> database table and connects them to an event handler as follows...
>
> btn = New Button
>
> btn.Text = dr("buttontext" ).ToString
>
> btn.Visible = True
>
> btn.Dock = DockStyle.Fill
>
> btn.BackColor = Color.FromKnown Color(KnownColo r.InactiveCapti onText)
>
> btn.Name = dr("buttonname" ).ToString
>
> If dr("AddressOf" ) = "historycli ck" Then
>
> AddHandler btn.Click, AddressOf historyClick
>
> ElseIf dr("AddressOf" ) = "pricelevelclic k" Then
>
> AddHandler btn.Click, AddressOf pricelevelClick
>
> ElseIf dr("AddressOf" ) = "keyboardsclick " Then
>
> AddHandler btn.Click, AddressOf keyboardsClick
>
> end if
>
> Is there any way to use a variable to link to the event handler delegate
> instead of comparing the db field value as in the above code
>
> e.g AddHandler btn.Click, AddressOf dr("AddressOf" ) (This doesn't work
> obviously)
>
>
>
> Regards
>
> Steve
>
>[/color]