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How to skip deleting the cell text of an exclusive ComboBox cell in WinForms GridControl?

Platform: WinForms |
Control: GridControl |
Published Date: February 28, 2015 |
Last Revised Date: December 19, 2019

Skip the deleting cell in grid

When you set the ComboBox in a Grid and assign the dropdown style as exclusive, the cell text is removed from the ComboBox cell while pressing delete key or backspace key.

Solution

To overcome this problem, you can use the CurrentCellKeyDown event to handle the Delete & BackSpace keys.

C#

// On Form load
this.gridControl1.CurrentCellKeyDown += new KeyEventHandler(gridControl1_CurrentCellKeyDown);
void gridControl1_CurrentCellKeyDown(object sender, KeyEventArgs e)
{
   GridCurrentCell cc = this.gridControl1.CurrentCell;
   if (cc.Renderer.StyleInfo.CellType == "ComboBox" && cc.Renderer.StyleInfo.DropDownStyle == GridDropDownStyle.Exclusive)
   {
      // Pressing delete key or backspacekey
      if (e.KeyCode == Keys.Back || e.KeyCode == Keys.Delete)
      {
         // not remove the cell content
         e.Handled = true;
      }
   }
}

VB

‘On Form load
AddHandler gridControl1.CurrentCellKeyDown, AddressOf gridControl1_CurrentCellKeyDown
' to perform action while pressing key
Private Sub gridControl1_CurrentCellKeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
    Dim cc As GridCurrentCell = Me.gridControl1.CurrentCell
    If cc.Renderer.StyleInfo.CellType Is "ComboBox" AndAlso  cc.Renderer.StyleInfo.DropDownStyle = GridDropDownStyle.Exclusive Then
      ' Pressing delete key or backspacekey
      If e.KeyCode = Keys.Back OrElse e.KeyCode = Keys.Delete Then
        ' not remove the cell content
        e.Handled = True
      End If
    End If
End Sub

Samples:

C#: DropdownStyle.Exclusive_C#.zip

VB: DropdownStyle.Exclusive_VB.zip

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