Why are some textboxes not accepting Control + A shortcut to select all by default
You might be looking for the ShortcutsEnabled property. Setting it to true
would allow your text boxes to implement the Ctrl+A shortcut (among others). From the documentation:
Use the
ShortcutsEnabled
property to enable or disable the following shortcut key combinations:
CTRL+Z
CTRL+E
CTRL+C
CTRL+Y
CTRL+X
CTRL+BACKSPACE
CTRL+V
CTRL+DELETE
CTRL+A
SHIFT+DELETE
CTRL+L
SHIFT+INSERT
CTRL+R
However, the documentation states:
The TextBox control does not support the CTRL+A shortcut key when the Multiline property value is true.
You will probably have to use another subclass of TextBoxBase
, such as RichTextBox, for that to work.
Indeed CTRL + A will not work unless you add something like this:
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Control && (e.KeyCode == Keys.A))
{
if (sender != null)
((TextBox)sender).SelectAll();
e.Handled = true;
}
}
This answer worked for me in a similar question (which isn't marked as accepted)
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
const int WM_KEYDOWN = 0x100;
var keyCode = (Keys) (msg.WParam.ToInt32() &
Convert.ToInt32(Keys.KeyCode));
if ((msg.Msg == WM_KEYDOWN && keyCode == Keys.A)
&& (ModifierKeys == Keys.Control)
&& txtYourTextBox.Focused)
{
txtYourTextBox.SelectAll();
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
Original Post: How can I allow ctrl+a with TextBox in winform?