Raising an event from a user control

[RSH]

Hi,

I have been trying to follow a tutorial on raising an event from a user
control and then handling it in the parent page.

The article is a little vague so I believe I have the code in place, but I
cant seem to get it to work.

Here is what I have:

' This is in the ascx control:
' GeneralInfo is an ImageButton in the ascx file
Public MustInherit Class EmployeeNavigat ion

Inherits System.Web.UI.U serControl

Public Event GeneralInfoClic ked(ByVal sender As System.Object, ByVal e
As System.Web.UI.I mageClickEventA rgs)



' This fires when the imagebutton is clickedPrivate Sub
GeneralInfo_Cli cked(ByVal sender As System.Object, ByVal e As
System.Web.UI.I mageClickEventA rgs) Handles GeneralInfo.Cli ck

RaiseEvent GeneralInfoClic ked(sender, e)

End Sub

End Class





This is excerpts of the code I have in the aspx page which inherits the ascx
page above.

Protected WithEvents EmployeeNavigat ion As EmployeeNavigat ion

Private Sub GeneralInfo_Cli cked(ByVal sender As Object, ByVal e As
System.Web.UI.I mageClickEventA rgs) Handles
EmployeeNavigat ion.GeneralInfo Clicked

Response.Write( "<BEVENT FIRED!</b>")



End Sub

[Phill W.]

Re: Raising an event from a user control

RSH wrote:

I have been trying to follow a tutorial on raising an event from a user
control and then handling it in the parent page.
>
The article is a little vague so I believe I have the code in place, but I
cant seem to get it to work.
>
Here is what I have:
>
Public MustInherit Class EmployeeNavigat ion
Inherits System.Web.UI.U serControl
>
Public Event GeneralInfoClic ked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
)
>
' This fires when the imagebutton is clicked
Private Sub GeneralInfo_Cli cked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
) Handles GeneralInfo.Cli ck
RaiseEvent GeneralInfoClic ked(sender, e)
End Sub
>
End Class
>
>
This is excerpts of the code I have in the aspx page which inherits the ascx
page above.
>
Protected WithEvents EmployeeNavigat ion As EmployeeNavigat ion

EmployeeNavigat ion is defined as MustInherit, so you cannot create
intances of it. I assume that you have a subclass somewhere that you
haven't shown us.

Since you're using inheritance, I would suggest handling the event this
way:

Public MustInherit Class EmployeeNavigat ion
Inherits System.Web.UI.U serControl

' This is the event exposed by this class (and its subclasses)
Public Event GeneralInfoClic ked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
)

' This fires when the imagebutton is clicked
' It uses the Protected method to raise the event.
Private Sub GeneralInfo_Cli cked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
) Handles GeneralInfo.Cli ck

Me.OnGeneralInf oClicked(e)

End Sub

' This routine actually raises the event
' Subclasses can call this directly to get the event raised
Protected Sub OnGeneralInfoCl icked( _
e As System.Web.UI.I mageClickEventA rgs _
)

RaiseEvent GeneralInfoClic ked(Me, e)

End Sub

End Class

Public Class SomeOtherEmploy eeNavigation
Inherits EmployeeNavigat ion

' Note: NO click code in here;
' that's encapsulated in the base class

End Class

Then, in your aspx code:

Protected WithEvents navigator As SomeOtherEmploy eeNavigation


HTH,
Phill W.

[RSH]

Re: Raising an event from a user control

Phil,

Thanks a ton! That is good stuff!

Actually the MustInherit was a mistake, I didn't need that and as it turned
out naming the instance the same name as the class is what seemed to be
flaking eveything out.

But I learned a ton by your example and I appreciate your time!

Ron

"Phill W." <p-.-a-.-w-a-r-d@o-p-e-n-.-a-c-.-u-kwrote in message
news:em8fsi$b3l $1@south.jnrs.j a.net...

RSH wrote:
>

>I have been trying to follow a tutorial on raising an event from a user
>control and then handling it in the parent page.
>>
>The article is a little vague so I believe I have the code in place, but
>I cant seem to get it to work.
>>
>Here is what I have:
>>
>Public MustInherit Class EmployeeNavigat ion
> Inherits System.Web.UI.U serControl
>>
> Public Event GeneralInfoClic ked( _
> ByVal sender As System.Object _
> , ByVal e As System.Web.UI.I mageClickEventA rgs _
> )
>>
> ' This fires when the imagebutton is clicked Private Sub
>GeneralInfo_Cl icked( _ ByVal sender As System.Object _ , ByVal e As
>System.Web.UI. ImageClickEvent Args _
> ) Handles GeneralInfo.Cli ck
> RaiseEvent GeneralInfoClic ked(sender, e)
> End Sub
>>
>End Class
>>
>>
>This is excerpts of the code I have in the aspx page which inherits the
>ascx page above.
>>
>Protected WithEvents EmployeeNavigat ion As EmployeeNavigat ion

>
EmployeeNavigat ion is defined as MustInherit, so you cannot create
intances of it. I assume that you have a subclass somewhere that you
haven't shown us.
>
Since you're using inheritance, I would suggest handling the event this
way:
>
Public MustInherit Class EmployeeNavigat ion
Inherits System.Web.UI.U serControl
>
' This is the event exposed by this class (and its subclasses)
Public Event GeneralInfoClic ked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
)
>
' This fires when the imagebutton is clicked
' It uses the Protected method to raise the event.
Private Sub GeneralInfo_Cli cked( _
ByVal sender As System.Object _
, ByVal e As System.Web.UI.I mageClickEventA rgs _
) Handles GeneralInfo.Cli ck
>
Me.OnGeneralInf oClicked(e)
>
End Sub
>
' This routine actually raises the event
' Subclasses can call this directly to get the event raised
Protected Sub OnGeneralInfoCl icked( _
e As System.Web.UI.I mageClickEventA rgs _
)
>
RaiseEvent GeneralInfoClic ked(Me, e)
>
End Sub
>
End Class
>
Public Class SomeOtherEmploy eeNavigation
Inherits EmployeeNavigat ion
>
' Note: NO click code in here;
' that's encapsulated in the base class
>
End Class
>
Then, in your aspx code:
>
Protected WithEvents navigator As SomeOtherEmploy eeNavigation
>
>
HTH,
Phill W.