adding events to programatically added controls in web user control
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21-06-2021 - |
Frage
I am trying to put a - what seems - very simple web user control
basically i want it to render as a dropdownlist/checkboxlist or radiolist based on a property but also want to be able to work out what is selected
i was trying the following - but cant seem to work out how to attach to the selectedindexchanged of the listcontrol so that i can set the selectd value(s) its not helping that my VB is not up to much but am forced to use it in this instance its not even giving me the intellisense for the event..
Public Options As List(Of Options)
Public ControlRenderType As ControlRenderType
Public IncludeFreeOption As Boolean
Public SelectedOptions As List(Of Options)
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
Dim c As ListControl
Select Case (ControlRenderType)
Case STGLib.ControlRenderType.CheckBoxList
c = New CheckBoxList()
Case STGLib.ControlRenderType.DropdownList
c = New DropDownList()
Case STGLib.ControlRenderType.RadioButtonList
c = New RadioButtonList()
Case Else
Throw New Exception("No Render Type Specified")
End Select
For Each opt In Options
Dim li = New ListItem(opt.Description, opt.ID)
c.Items.Add(li)
Next
c.SelectedIndexChanged += ..?? or something
Page.Controls.Add(c)
End Sub
can anyone explain please - it is of course quite possible that I am going about this in completely the wrong way..
thanks
Lösung
First create a Sub or a Function to handle the IndexChange of the object that you have created dynamically and make sure that the signature of the Sub is something like this
Sub myOwnSub(ByVal sender As Object, ByVal e As EventArgs)
...
... Handle your event here
...
End Sub
Then after you create your object add the following code
Dim obj as ListBox
AddHandler obj.SelectedIndexChanged, AddressOf myOwnSub