BUG: KeyPad PLUS SIGN (+) and MINUS SIGN (-) Do Not Appear in DataGrid Control with Visual Basic .NET (328590)

RESOLUTION

To resolve the problem, you must inherit your own datagrid class from System.Windows.Forms.DataGrid class, and then override the following functions:

• OnKeyDown

The following code demonstrates this resolution:

Public Class MyDataGrid
    Inherits System.Windows.Forms.DataGrid

    Protected Overrides Sub OnKeyDown(ByVal ke As System.Windows.Forms.KeyEventArgs)
        Select Case ke.KeyCode
            Case Keys.Add
                ke = New KeyEventArgs(ke.Modifiers Or Keys.Oemplus)
            Case Keys.Subtract
                ke = New KeyEventArgs(ke.Modifiers Or Keys.OemMinus)
        End Select
        MyBase.OnKeyDown(ke)
        MyBase.ProcessGridKey(ke)
    End Sub

    Protected Overrides Function ProcessDialogKey(ByVal keyData As System.Windows.Forms.Keys) As Boolean
        Select Case keyData
            Case Keys.Add
                Return MyBase.ProcessDialogKey(Keys.Oemplus)
            Case Keys.Subtract
                Return MyBase.ProcessDialogKey(Keys.OemMinus)
            Case Else
                Return MyBase.ProcessDialogKey(keyData)
        End Select
    End Function

    Protected Overrides Function ProcessKeyPreview(ByRef m As System.Windows.Forms.Message) As Boolean
        Const WM_KEYDOWN As Integer = &H100
        If m.Msg = WM_KEYDOWN Then
            Dim ke As New KeyEventArgs(CType(m.WParam.ToInt32(), Keys) Or ModifierKeys)
            Select Case ke.KeyCode
                Case Keys.Add
                    ke = New KeyEventArgs(Keys.Oemplus Or ModifierKeys)
                Case Keys.Subtract
                    ke = New KeyEventArgs(Keys.OemMinus Or ModifierKeys)
            End Select
            Return MyBase.ProcessGridKey(ke)
        End If
        Return MyBase.ProcessKeyPreview(m)
    End Function<BR/>
End Class