为什么在这种情况下 e.Handled = true 不会停止密钥处理？

Question

I have this code. When I hit Enter when toolFolderName (a toolbar textbox) has focus, the Enter key is processed fine. Then, despite the e.Handled = true; the filesDataGridView_KeyUp event fires. Curiously (or maybe not, you decide), if I set a breakpoint in toolFolderName_KeyPress , and hit Continue when execution breaks, without doing anything else, the keystroke does not propagate to the DGV event.

I realize I'm using both KeyUp and KeyPress events. Does e.Handled not work across those events? I want a toolbar textbox and a DGV on the same form to use the Enter key, each for its own purposes. What approach should I take?

private void toolFolderName_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((Keys)e.KeyChar == Keys.Return)
    {
         // code
         // code
         e.Handled = true;//does this not mean "Hey, every control on this form,
                          //ignore this keystroke, it has been handled?"
    }
}

private void filesDataGridView_KeyUp(object sender, KeyEventArgs e)
{
    // receives Enter key despite e.Handled in toolFolderName_KeyPress
    if (e.KeyCode == Keys.Return)
    {
        // processing code
        e.Handled = true;
    }
}

Answer 1

e.Handled only applies to this very event. If you want to suppress processing of KeyUp as well, you must use the same logic in the KeyUp handler or set a flag (most likely a bool ) in the KeyDown handler that tells the KeyUp handler to ignore its KeyUp event as well.