Rise event from user control written in main page

Question

I have searched this site for what I need, but none of the answers just quite fits my needs. So here's the deal:

I am dynamically loading a usercontrol to aspx page along with some buttons like this:

Dim uc As UserControl
Dim btns As New List(Of LinkButton)
uc = LoadControl("path_to_ascx")
btns.Add(New LinkButton With {.ID = "btnid", .Text = "Sometext"})
uc.GetType().GetProperty("tblButtons").SetValue(uc, btns, Nothing)
holder2.Controls.Add(uc) 'holder2 is an id of a PlaceHolder

An this work perfectly fine. The buttons show on the page as expected. Now I am having trouble, how to tell these buttons to rise an event written in aspx page, to which a usercontrol is being loaded to.

Public Sub btnClick(sender As Object, e As EventArgs)
    'do stuff
End Sub

Why I want to achieve this? Because I have a pretty complex UserControl which I want to reuse as much as possible, but buttons will do different stuff on every aspx page this UserControl will be loaded to.

Thanks

The thing is, your question is already answered here https://stackoverflow.com/questions/7713242/asp-net-dynamically-button-with-event-handler. Al you have to do is to google "asp.net dynamic buttons with events" — T.S., Aug 03 '17 at 21:37
@T.S., I don't think the link provided solves my problem. The buttons are declared in aspx, but they are sent trough a property to usercontrol and they are added to gridview cell. Also, how to set a command argument based on gridview row value. And those buttons must fire event written in aspx. Is this even possible? — VR46theDoc, Aug 04 '17 at 07:13

VR46theDoc · Answer 1 · 2017-08-07T19:37:40.337

I have solved my problem. In UserControl, I added dynamic buttons to every row on OnRowCreated event.

I was loading UserControl to aspx with buttons like in my question, I just added an ID property to my usercontrol:

Dim uc As UserControl
Dim btns As New List(Of LinkButton)
uc = LoadControl("path_to_ascx")
btns.Add(New LinkButton With {.ID = "btnid", .Text = "Sometext", .CommandName = "cmdName"})
uc.ID = "UserControl1" 'here I added ID property
uc.GetType().GetProperty("tblButtons").SetValue(uc, btns, Nothing)
holder2.Controls.Add(uc) 'holder2 is an id of a PlaceHolder

And after I add an EventHanlder like this:

AddHandler TryCast(holder2.FindControl("UserControl1").FindControl("grid"), GridView).RowCommand, AddressOf grid_RowCommand
'grid is the ID of GrdiView in UserControl

And here is the event for gridview rowCommand written in aspx code behind:

Protected Sub grid_RowCommand(sender As Object, e As GridViewCommandEventArgs)
    If e.CommandName = "someCmdName" Then
        'do stuff
    Else
        'do somthing else
    End If
End Sub

Maybe my question was not good enough, because I did not mention, that I will be loading buttons to gridview row on rowCreated event and hook them up to RowCommand for wich I apologise.

If someone knows another way to do this, it would be much appreciated to share.

Regards

Rise event from user control written in main page

1 Answers1