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02.15.2008 at 02:48PM PST, ID: 23167555
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7.8
allow user entry in DataGridViewComboBox
Zones: .NET, Microsoft Visual Basic.Net
Tags: DataGridViewComboBox, VB.net, .net, Datagridview, combobox, bound
I have a DataGridViewComboBox that is bound to a simple "lookup" dataset (5 sec = 500, 10 sec = 1000, etc.) How do I allow a user to manually enter a different time (i.e. 3400) in the DataGridViewComboBox?

Thanks for the assist....

I've Googled the heck out of this and have found a few examples in C#. Alas, I barely know VB.Net
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Question Stats
Zone: Programming
Question Asked By: judsonhh
Solution Provided By: Dabas
Participating Experts: 1
Solution Grade: A
Views: 88
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02.16.2008 at 04:25PM PST, ID: 20911944

Rank: Guru

Dabas:

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02.16.2008 at 07:44PM PST, ID: 20912609
judsonhh:

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02.18.2008 at 06:40AM PST, ID: 20920214
judsonhh:

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02.18.2008 at 09:01AM PST, ID: 20921526
judsonhh:

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02.18.2008 at 12:10PM PST, ID: 20923021

Rank: Guru

Dabas:

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02.18.2008 at 01:18PM PST, ID: 20923522
judsonhh:

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02.18.2008 at 01:22PM PST, ID: 20923557
judsonhh:

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02.18.2008 at 01:27PM PST, ID: 20923613

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Dabas:

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02.18.2008 at 01:56PM PST, ID: 20923857
judsonhh:

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02.18.2008 at 02:05PM PST, ID: 20923929

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Dabas:

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02.16.2008 at 04:25PM PST, ID: 20911944

Rank: Guru

Dabas:
Hello judsonhh,

To save us both time, please type a link to a promising example in C#, and I will try to translate the relevant code into VB.NET for you

Regards,

Dabas
 
02.16.2008 at 07:44PM PST, ID: 20912609
judsonhh:
I'll look and find it again ......
 
02.18.2008 at 06:40AM PST, ID: 20920214
judsonhh:
http://allthelayers.com/?p=16

I think this is what I'm trying to do.

If this isn't what I want (I simply want this column to list "normal" time possibiliies while allowing a user to manually enter their own times if neccessary), do you know how to populate a DGVComboBox with a list of values that operates like a "lookup" list and also allows for user entry?
 
02.18.2008 at 09:01AM PST, ID: 20921526
judsonhh:
Here is some C# code i found that does what I need ( I think)
private void dataGridView1_CellValidating(object sender,
             DataGridViewCellValidatingEventArgs e)
{
    if (e.ColumnIndex == comboBoxColumn.DisplayIndex)
    {
        if (!this.comboBoxColumn.Items.Contains(e.FormattedValue))
        {
            this.comboBoxColumn.Items.Add(e.FormattedValue);
        }
    }
}

private void dataGridView1_EditingControlShowing(object sender,
            DataGridViewEditingControlShowingEventArgs e)
{
    if (this.dataGridView1.CurrentCellAddress.X == comboBoxColumn.DisplayIndex)
    {
        ComboBox cb = e.Control as ComboBox;
        if (cb != null)
        {
            cb.DropDownStyle = ComboBoxStyle.DropDown;
         }
    }
}


and attached is the code I'm trying. however I'm getting an InvalidCastException at the marked line. It says "Unable to cast object of type 'System.Windows.Forms.DataGridViewTextBoxColumn' to type 'System.Windows.Forms.DataGridViewComboBoxColumn'." when i click on the ComboBox. 
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Private Sub DataGridView_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms. _
          DataGridViewEditingControlShowingEventArgs) _
       Handles DataGridView.EditingControlShowing
 
        Dim comboBoxColumn As DataGridViewComboBoxColumn = _
           DataGridView.Columns(4)
        If (DataGridView.CurrentCellAddress.X = _
           comboBoxColumn.DisplayIndex) Then
            Dim cb As ComboBox = e.Control
            If (cb IsNot Nothing) Then
                cb.DropDownStyle = ComboBoxStyle.DropDown
            End If
        End If
    End Sub
 
 
    Private Sub DataGridView_CellValidating( _
       ByVal sender As Object, _
       ByVal e As System.Windows.Forms. _
       DataGridViewCellValidatingEventArgs) _
       Handles DataGridView.CellValidating
 
        Dim comboBoxColumn As DataGridViewComboBoxColumn = DataGridView.Columns(4) '<<<<<<<<<<< 'InvalidCastException Here
        If (e.ColumnIndex = comboBoxColumn.DisplayIndex) Then
            If (Not comboBoxColumn.Items.Contains(e.FormattedValue)) Then
                comboBoxColumn.Items.Add(e.FormattedValue)
            End If
        End If
    End Sub
Open in New Window
 
02.18.2008 at 12:10PM PST, ID: 20923021

Rank: Guru

Dabas:
judsonhh,

That error seems to indicate that your DataGridView.Columns(4) is of type TextBox and not ComboBox.
Maybe you are using the wrong column? Columns(4) is the FIFTH column, as numbering starts with zero.

Dabas
 
02.18.2008 at 01:18PM PST, ID: 20923522
judsonhh:
Ahhhhh, let me change that .... get right back to you!
 
02.18.2008 at 01:22PM PST, ID: 20923557
judsonhh:
That was "that" problem. Now it error s at the marked line with "ArgumentException was unhandled" ...Items collection cannot be modified when the DataSource property is set.


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Private Sub DataGridViewEditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms. _
          DataGridViewEditingControlShowingEventArgs) _
       Handles DataGridView.EditingControlShowing
 
        Dim comboBoxColumn As DataGridViewComboBoxColumn = _
           DataGridView.Columns(3)
        If (DataGridView.CurrentCellAddress.X = _
           comboBoxColumn.DisplayIndex) Then
            Dim cb As ComboBox = e.Control
            If (cb IsNot Nothing) Then
                cb.DropDownStyle = ComboBoxStyle.DropDown
            End If
        End If
    End Sub
 
 
    Private Sub DataGridView_CellValidating( _
       ByVal sender As Object, _
       ByVal e As System.Windows.Forms. _
       DataGridViewCellValidatingEventArgs) _
       Handles DataGridView.CellValidating
 
        Dim comboBoxColumn As DataGridViewComboBoxColumn = DataGridView.Columns(3) '<<<<<<<<<<< 'InvalidCastException Here
        If (e.ColumnIndex = comboBoxColumn.DisplayIndex) Then
            If (Not comboBoxColumn.Items.Contains(e.FormattedValue)) Then
                comboBoxColumn.Items.Add(e.FormattedValue) <<<<<<<< Exception Here
            End If
        End If
    End Sub
Open in New Window
 
02.18.2008 at 01:27PM PST, ID: 20923613

Rank: Guru

Dabas:
judsonhh,

What that means is that your DataGrid is bound to a datasource.
Any change you want to do, has to be done on the object that the grid is bound to, not the combobox itself.

In short, lets assume your ComboBox within the datagrid is bound to a DataTable, then you should be adding your item to the underlying DataTable, not to the ComboBox

Dabas
 
02.18.2008 at 01:56PM PST, ID: 20923857
judsonhh:
Hmmm, that's what I was afraid of .... So there's no way to has a user editable DGVComboBox that is bound? How about a way to create a "lookup" ComboBox that is not bound?
 
02.18.2008 at 02:05PM PST, ID: 20923929

Rank: Guru

Dabas:
judsonhh,

Changing these type of bound objects is quite easy if you use a Binding Object Programming (BOP) approach.

I suggest you have a look at a detailed explanation in http://www.paulstovell.net/blog/index.php/binding-patterns-0x0002-binding-to-objects/
Specially the videos that Paul Stovell lets you download there.
The 45 minutes (each) spent on viewing those presentations have saved me HOURS of work dealing with the type of problem you are experiencing.

Unfortunately his examples are in C#, but he does make an effort to explain the VB.NET approach too.

Dabas
Accepted Solution
 
 
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