force call selection changed event

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I have a VB project I am working on and I can't, for the life of me, remember how to force call a SelectionChanged event. Below is the code I am trying to call...

VB

Private Sub cbxName_SelectionChanged(sender As Object, e As SelectionChangedEventArgs) Handles cbxName.SelectionChanged
    Try
        Dim cmb As ComboBox = sender
        Dim i As Integer = cmb.SelectedIndex
        Dim cust As Customer = Customers(i)
        Me.DataContext = cust
    Catch ex As Exception

    End Try
End Sub

...and here is the code where I am trying to call it. (I'm doing it this way, because for some reason the sub isn't being called when my If/Then statement fires.)

VB

Private Sub RetrieveProperties()
    Try
        If appDRAW.Documents.Count = 0 Then Exit Sub
        dcmnt = appDRAW.ActiveDocument
        If dcmnt.FileName <> "" Then txbPONum.Text = Left(dcmnt.FileName, Len(dcmnt.FileName) - 4) Else txbPONum.Text = ""
        If dcmnt.Properties.Exists("Customer", 1) Then cbxName.Text = dcmnt.Properties("Customer", 1)
        'FORCE CALL cbxName_SelectionChanged
        ...

    Catch ex As Exception
        MessageBox.Show("Can't Retrieve Properties:" & vbLf & ex.Message)
    End Try
End Sub

I'm thinking maybe something like...
If Customers.Contains(dcmnt.Properties("Customer", 1)) then cbxName.Text = [what ever the index of the query was.]

How do I figure out what the query selection index is? or how would I complete that if statement?

Posted 8-Dec-14 4:52am

Sean Donnahoe

Updated 8-Dec-14 8:17am

v2

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[no name] 8-Dec-14 11:56am

Which if statement are you referring to? Have you tried debugging your code to see why it does not fire? See SelectedIndex Your question is illogical since you are firing the IndexChanged Event when you select it...

Sean Donnahoe 8-Dec-14 12:06pm

The only If statement that pertains to cbxName object.
If dcmnt.Properties.Exists("Customer", 1) Then cbxName.Text = dcmnt.Properties("Customer", 1)
The combobox (cbxName) that is referenced, gets updated from the if statement, but the DataContext for the rest of the forms bound objects does not seem to get updated.

Sean Donnahoe 8-Dec-14 12:16pm

I'm thinking maybe something like...
If Customers.Contains(dcmnt.Properties("Customer", 1)) then cbxName.Text = [what ever the index of the query was.]

How do I figure out what the query selection index is? or how would I complete that if statement?

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OriginalGriff · Accepted Answer · 2014-12-08T08:30:00

Solution 1

Why "force call" anything? Why not just move the code from your event handler into a separate method and call that from two places?

Posted 8-Dec-14 8:30am

OriginalGriff

Comments

Sean Donnahoe 8-Dec-14 15:37pm

I tried that, but I always get an 'Index was out of range' error. The combobox being checked has XML data bound to it, so the If/Then statement in question needs to match an object that is referenced in the XML.

OriginalGriff 8-Dec-14 15:39pm

So use the sender parameter to identify the combobox that raided the event.

Sean Donnahoe 8-Dec-14 15:41pm

How do you mean?

OriginalGriff 8-Dec-14 15:55pm

When you get an event, the sender parameter holds the class instance that raised the event. In the case of a Control event handler, it's the instance of the control that the user interacted with. All you have to do is cast it to the appropriate Control class.

Sean Donnahoe 8-Dec-14 15:58pm

Did I mention I'm new to this? LOL. Sorry that went straight over my head. I mean, I understand about sender, but not sure how to use it out of the context of the Sub functionality.

Sean Donnahoe 8-Dec-14 16:17pm

OriginalGriff, I think I have it working as expected now, the outstanding problem is that if the data being added (from the dcmnt.Properties("Customer", 1)) to the combobox is blank, I get the out of range error. I'm trying to figure out how to test for empty data. I originally added a blank field to my XML, but that threw the same error. I tried setting the blank XML <name> field to 'Customer not provided', but that caused other issues. Once, I get the blank data error out of the way, I think CorelDraw is causing my other issues and I will be posting a description of events in their forum for discussion.