ComboBox SelectionChangedCommitted + Setting Focus = Problem

[mickey_pt]

Hi
Like the title says, the combination of the SelectionChangedCommited event, and inside the event selecting another control (focus), causes to the combo box select another item that isn't the "selected" one.

To understand the problem, i have a combo box that is databinded to a datatable, the style it's dropdownlist, and the autocomplete property it's suggest and append, when the user starts typing i can see that the correct item it's selected, then the user press the Enter key, and commit the selection, looking to the code, the selected item it's the correct one, then i do everything that i need with the item and after that (all inside the event selecction changed committed), i set the focus in another control, in this case it's a textbox. After setting the focus in the textbox in the combobox the displayed item it's not the correct/"selected" one, even if the code used the right one...
If i remove the line to set the focus in the other control, everything works has expected.

The only event that i handle of the combo box it's the SelectionChangedCommitted.

I made some tests, and when I'm "typing" in the combo, the events for index changed and value changed are all firing has expected, and only commits the selection after pressing the Enter Key, and at this point, the item selected it's the same in the 3 events. And none of the events get fired again after setting the focus in the other control...

What i'm missing here?

I can solve the problem easily using and auxiliary var that stores the index selected, and then in the Got Focus off the other control, setting the correct index...

Sample Test Code, Form with one Combo and oneTextBox.

Public Class Form1
 
    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Dim dt As New DataTable("Teste")
        dt.Columns.Add(New DataColumn("TestColumn"))
        dt.Rows.Add({"11111"})
        dt.Rows.Add({"12341"})
        dt.Rows.Add({"34334"})
        dt.Rows.Add({"55555"})
        dt.Rows.Add({"55566"})
        dt.Rows.Add({"88111"})
        dt.Rows.Add({"99911"})
 
        With ComboBox1
            .DropDownStyle = ComboBoxStyle.DropDownList
            .AutoCompleteMode = AutoCompleteMode.SuggestAppend
            .DisplayMember = "TestColumn"
            .ValueMember = "TestColumn"
            .DataSource = dt
        End With
    End Sub
 
   
 
    Private Sub ComboBox1_SelectionChangeCommitted(sender As Object, e As System.EventArgs) Handles ComboBox1.SelectionChangeCommitted
        TextBox1.Text = ComboBox1.SelectedValue.ToString
        'aux = ComboBox1.SelectedIndex 'WorkAround
        TextBox1.Focus()
    End Sub
 
    ''WorkAround
    'Private aux As Integer = -1
    'Private Sub TextBox1_GotFocus(sender As Object, e As System.EventArgs) Handles TextBox1.GotFocus
    '    ComboBox1.SelectedIndex = aux
    'End Sub
End Class

To test, just press 5,5,5,6,ENTER. In the textbox it will have the 55566 has expected, but in the combo it will have another value...

[jmcilhinney]

Given that the documentation expressly states that application developers should call the Select method to set focus to a control and NOT the Focus method, the very first thing you should do is change that and see whether that fixes the problem. Maybe it will and maybe it won't but if you do exactly what the documentation tells you not to do and something doesn't work, the first change to make is obvious.

[BlackRiver]

Edited....It doesn't work

[mickey_pt]

Thanks JMC
Didn't read the documentation...
But changed to Select instead of Focus, and that didn't solve the issue.

[BlackRiver]

Something I found, maybe it could help:

http://support.microsoft.com/kb/2868238/en-us

EDIT:

After applying the fix this works fine for me:

Public Class Form1
 
    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Dim dt As New DataTable("Teste")
 
        dt.Columns.Add("ValueColumn", GetType(Integer))
        dt.Columns.Add("DisplayColumn", GetType(String))
 
        dt.Rows.Add(0, "111111")
        dt.Rows.Add(1, "12341")
        dt.Rows.Add(2, "34334")
        dt.Rows.Add(3, "55555")
        dt.Rows.Add(4, "55566")
        dt.Rows.Add(5, "555676")
        dt.Rows.Add(6, "88111")
        dt.Rows.Add(7, "99911")
 
 
        ComboBox1.DataSource = dt
        ComboBox1.DisplayMember = "DisplayColumn"
        ComboBox1.ValueMember = "ValueColumn"
 
        ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList
        ComboBox1.AutoCompleteSource = AutoCompleteSource.ListItems
        ComboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend
 
 
 
    End Sub
 
 
 
 
 
 
    Private Sub ComboBox1_SelectionChangeCommitted(sender As Object, e As System.EventArgs) Handles ComboBox1.SelectionChangeCommitted
        TextBox1.Text = ComboBox1.Text
 
        'aux = ComboBox1.SelectedIndex 'WorkAround
        TextBox1.Focus()
    End Sub

[mickey_pt]

Thanks BlackRiver
That solved the problem! In my specific case was the Enter key, but anyway, problem solved.
Before posting i searched a lot, but looks like i didn't used the right words!

[BlackRiver]

Glad I could help