Check for illegal char in DataGridTextBoxColumn

  • Thread starter Thread starter Wild Gooose
  • Start date Start date
W

Wild Gooose

Hi all, need some help in taking the right approach to
solve this problem.
I have a DataGrid bound to a DataTable. I need the user to
enter only numerical values and decimal. I did override
the ProcessCmdKey of DataGrid. I'm capturing Enter, Tab,
directinal and other keys. If the user enters an invalid
key, I need to prompt him. But, for this I'll need to map
all the other keys to be invalid in my code. Is there any
other slick way of doing this.

Code attached.

protected override bool ProcessCmdKey(ref Message msg,
Keys keyData)
{
const int WM_KEYDOWN = 0x100;
const int WM_SYSKEYDOWN = 0x104;
int rowNum = dGInput.CurrentCell.RowNumber;
int colNum = dGInput.CurrentCell.ColumnNumber;

if ((colNum == 2) || (colNum == 5))
{
if ((msg.Msg == WM_KEYDOWN) || (msg.Msg == WM_SYSKEYDOWN))
{
switch(keyData)
{
case Keys.D0:
case Keys.D1:
case Keys.D2:
case Keys.D3:
case Keys.D4:
case Keys.D5:
case Keys.D6:
case Keys.D7:
case Keys.D8:
case Keys.D9:
case Keys.NumPad0:
case Keys.NumPad1:
case Keys.NumPad2:
case Keys.NumPad3:
case Keys.NumPad4:
case Keys.NumPad5:
case Keys.NumPad6:
case Keys.NumPad7:
case Keys.NumPad8:
case Keys.NumPad9:
case Keys.Decimal:
case Keys.OemPeriod:
break;
case Keys.Back:
break;
case Keys.Down:
case Keys.Up:
case Keys.Left:
case Keys.Right:
case Keys.Enter:
case Keys.Tab:
UpdateDataGridCell(rowNum,colNum);
break;
default:
MessageBox.Show("Invalid character","Error");
break;
}
}
}
 
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