Question

I have a custom DataGridViewCell with a user-control as its editing control. The cell was built in the style of this article: http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewcell.initializeeditingcontrol.aspx

For the most part, this works great. The problem is that the regular behavior of a DataGridViewCell is to pass the keystroke used to enter EditMode to the control, but that’s not happening for this cell.

Example:

I select the custom date cell, and type in “12/24/2008”, the “1” begins EditMode, and “2/24/2008” appears in the cell.

How do I get the first keystroke to the editing control?

Public Class DataGridViewDateCell
    Public Overrides Function KeyEntersEditMode(ByVal e As System.Windows.Forms.KeyEventArgs) As Boolean
        'Any key-sequences with modifiers will not enter edit mode'
        If e.Control Or e.Shift Or e.Alt Then Return False

        'Accept numbers, '/', and '-''
        If (e.KeyCode >= Keys.NumPad0 And e.KeyCode <= Keys.NumPad9) OrElse _
            (Char.IsDigit(ChrW(e.KeyCode))) OrElse _
            e.KeyCode = Keys.Subtract OrElse _
            e.KeyCode = Keys.Divide OrElse _
            e.KeyCode = Keys.OemMinus OrElse _
            e.KeyCode = Keys.OemQuestion Then
            Return True
        End If

        'Any other keys should be ignored'
        Return False
    End Function

    Public Overrides ReadOnly Property EditType() As System.Type
        Get
            Return GetType(DataGridViewDateEditingControl)
        End Get
    End Property
End Class

Answer 1

I figured it out!

The custom control has a TextBox on it that always has focus (at least, within the usercontrol). When the user types, the keystrokes are going directly to the TextBox. But when the DataGridViewCell passes the keystroke to the control, it goes to the user control, not the TextBox.

I added this code to the usercontrol to fix it:

Private Sub ucDateTime_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
    DateText.AppendText(e.KeyChar)
    DateText_KeyPress(sender, e)
End Sub