Hmmm....
This is going to be a shot, but, you did say you have the KeyUp, KeyDown and KeyPress event handlers right? Have you set the flag e.Handled to true in the event handlers, have a look here:
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
e.Handled = true;
}
private void textBox1_KeyUp(object sender, KeyEventArgs e)
{
e.Handled = true;
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = true;
}
Have a look here in the MSDN about this Handled property. (If you have MSDN 2008 SP 1 installed locally, the link is ms-help://MS.MSDNQTR.v90.en/fxref_system.windows.forms/html/dfc80b44-1d79-6315-cbea-1388a048c018.htm)
To quote:
Handled is implemented differently by different controls within Windows Forms.
For controls like TextBox which subclass native Win32 controls, it is
interpreted to mean that the key message should not be passed to the underlying
native control.
If you set Handled to true on a TextBox, that control will not pass the key
press events to the underlying Win32 text box control, but it will still
display the characters that the user typed.
Maybe it is not set i.e. e.Handled = false; thereby preventing the TextChanged Event from firing?
Can you check and confirm this?
Edit: After dreadprivateryan's response, I can suspect (due to lack of code posted), based on his response, e.Handled is true for when Enter key is pressed and false for everything else which in my mind, thinks that is the reason why no further keystrokes are being accepted as a result of this.
- Are you trying to set focus to another control upon the Enter key being pressed? It could be that both KeyUp and KeyDown are conflicting...
- Remove the keyboard hook and disable it...
- My suggestion is to change the code completely in this manner as shown, take out either KeyDown or KeyUp Event Handler as they, simplistically put it, are the same, ok, technically, it is designated respectively for when a key is pressed down, and likewise when a key is released. Have a look at this link here. There was a similar question posted here on SO.
In the example below, I used the keyUp event handler to switch focus to the next available control upon enter key being pressed. In the KeyPress event handler, this simply filters the input and only allows numbers 0-9 respectively, anything else gets discarded. Included in that event handler, is the allowance for the backspace key to provide editing.
private void textBox1_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter) SendKeys.Send("{TAB}");
}
private const string VALID_KEYS = "0123456789";
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (VALID_KEYS.IndexOf(char.ToUpper(e.KeyChar)) != -1 || e.KeyChar == (char)8)
e.Handled = false;
else
e.Handled = true;
}
Hope this helps,
Best regards,
Tom.
