Raised Event Bypassed

[georg]

Hello All,

 

I am having trouble raising an event in class "a" and handling it in class "b".

 

When my code gets around to the raise event statement (in class "a") the debugger just moves over it and on to the next line of code, without raising any type of error.

 

Has anyone else seen this/knows what is going on?

 

Thanks,

 

georg

[JABE]

Quite difficult to tell unless we see the code. Would you mind if you post some snippets?

[Heiko]

Is there an event handler attached to the event in class a ?

 

In class b, is instance of a declared with events?

[georg]

Thanks for the interest guys.

 

Ok, the situation is a bit more complex than I originally stated.

 

- Creating a datagrid programmatically

- Datagrid has 4 combo boxes also created programmatically.

- Project at this stage has a number of classes in a number of modules

- I have 1 class for the combo box column Public Class DataGridComboBoxColumn (Inherits DataGridTextBoxColumn) object ...

- and another for the datagrid object: Public Class DataGridCoW (Inherits DataGrid).

- When I need to respond to a changed event in the combo box, it seems best to do it in the Combo Box class, raise a custom event and then deal with this in the Datagrid class.

 

I'm happy to simply call a proc in the DataGridCoW class, but I can't work out how to do this either.

 

As you can see I am new to OO, and wondering if my approach is just mangled procedural code for OO.

 

Class "a" (a Component)

Public Class DataGridComboBoxColumn
Public Event LeavingHowPaid As DataGridComboBoxLeaveEventHandler
AddHandler ColumnComboBox.Leave, New EventHandler(AddressOf LeaveComboBox)
 Public Sub LeaveComboBox(ByVal sender As Object, ByVal e As System.EventArgs) Handles ColumnComboBox.Leave
   Dim sCBText As String
           sCBText = ColumnComboBox.Text
	c = Me.DataGridTableStyle.DataGrid.CurrentCell.ColumnNumber
'###this is where I try to raise the event
	If sCBText = "CHQ" Then
	RaiseEvent LeavingHowPaid(_rowNum, c ,sCBText)
       	End If
       End Sub
End class

Then in a class (not really sure why I am doing this):

Public Class Delegator
Public Delegate Sub DataGridComboBoxLeaveEventHandler(ByVal r As Integer, ByVal c As Integer, ByVal sHowPaid As String)
End class

Then in Class "b" (a Component):

   Public Class DataGridCoW
       Inherits DataGrid
       Private WithEvents _cbc As DataGridComboBoxColumn
       Private Sub _cbc_LeavingHowPaid(ByVal r As Integer, ByVal c As Integer, ByVal sHowPaid As String) Handles _cbc.LeavingHowPaid
           MessageBox.Show(sHowPaid)
       End Sub
End class

The object DataGridComboBoxColumn was instansiated in another class, and added to the datagrid.

 

Just thinking about this has given me a few ideas for testing, so I may come back with a bit more information.

 

Thanks,

 

georg

Edited June 26, 2003 by georg

[PlausiblyDamp]

Perhaps I've missed it in your code but you don't appear to be telling class b to handle the event.

 

ps if you wrap you code in [ vb ] [ /vb ] but remove the spaces the forum will format up the code and make it easier to read.

[georg]

PlausiblyDamp: Thanks for the tip on the HTML .

How would I tell class b to handle the event.?

 

Heiko: I'm pretty sure that I have both of the elements that you suggested.

 

georg

[georg]

Credit to PlausiblyDamp!

 

(And maybe the 1 hour of (ocean) surfing to clear my head.)

 

My addhandler statement (when I instansiated the Class DataGridComboBoxColumn) wasn't telling Class "b" to handle the event .

 

Thanks.

 

georg.