Below is my code for disabling beep sound when I press "Enter" on textbox KeyDown() event:
if (e.KeyCode == Keys.Enter)
{
e.SuppressKeyPress = true;
SaveData();
e.Handled = true;
}
But it keeps beeping when I press "Enter" on textbox. What am I doing wrong?
From your comments, showing a MessageBox will interfere with your setting of the SuppressKeyPress property.
A work-around is to delay the showing of the MessageBox until after the method is completed:
void TextBox1_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.Enter) {
e.SuppressKeyPress = true;
this.BeginInvoke(new Action(() => SaveData()));
}
}
EDIT
Please note that the answer provided by LarsTech (below) is a far better approach.
Sorry, I just realised that you have a MessageBox displaying.
What you can do is have a Timer and have it fire off the SaveData() method.
private void Timer1_Tick(System.Object sender, System.EventArgs e)
{
Timer1.Enabled = false;
SaveData();
}
Then in your TextBox keypress event, do this:
if (e.KeyCode == Keys.Enter) {
e.SuppressKeyPress = true;
Timer1.Enabled = true;
}
That seems to work...
You could try creating your own textbox and handle the keydown event like so:
public class MyTextBox : TextBox
{
protected override void OnKeyDown(KeyEventArgs e)
{
switch (e.KeyCode)
{
case (Keys.Return):
/*
* Your Code to handle the event
*
*/
return; //Not calling base method, to stop 'ding'
}
base.OnKeyDown(e);
}
}
Related
If the user hits the enter key, I want to show a message saying the enter key was hit. Else, I want to type in the textbox as normal.
private void enterCheck(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
MessageBox.Show("Enter Was Clicked");
}
}
If enter is hit the message is displayed correctly. However, if I try to type a sentence, nothing appears in the textbox.
This will work...
private void enterCheck(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
MessageBox.Show("Enter Was Clicked");
}
else
{
MessageBox.Show(e.KeyCode.ToString());
}
}
However I don't want a messagebox showing every letter that was typed.
Try this:
private void enterCheck(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
MessageBox.Show(e.KeyCode.ToString());
}
else
{
e.Handled = true;
}
}
Please work! This is the most confusing I've ever encountered!
Use the KeyPress event:
// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
// Check for the flag being set in the KeyDown event.
if (e.KeyChar == (char)Keys.Return)
{
// Stop the character from being entered into the control since it is non-numerical.
MessageBox.Show("Enter Was Pressed");
e.Handled = true;
}
}
Let's say I've got this:
private void txtAnalogValue_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
//Non-numeric key pressed => prevent this from being input into the Textbox
e.SuppressKeyPress = true;
}
}
and this:
private void txtAnalogValue_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
try
{
UpdateState(double.Parse(((TextBox)sender).Text));
}
catch (Exception ex)
{
((TextBox)sender).Text = ioElement.StateVal.ToString("0.00");
}
}
}
I know this code doesn't make a lot of sense, it's just test.
The question is: Will the e.SuppressKeyPress = true in KeyDown event have affect on KeyUp event, so the Enter key will not be accepted?
No, e.SuppressKeyPress = true will just ignore the Enter key (it won't go to the next line and Text property of the textbox won't be changed) and e.Keycode will be visible in the KeyUp. Therefore suppressing the key in the KeyDown doesn't affect the KeyUp event and your code should work. The UpdateState will be called when you hit Enter button in the TextBox. You can try this code to check it:
private void txtAnalogValue_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.A)
{
e.SuppressKeyPress = true;
}
}
private void txtAnalogValue_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.A)
{
MessageBox.Show("Up");
}
}
I have read that I can suppress this noise by defining a form accept button, which is something I am trying to avoid (I can point it at a hidden or inactive button I suppose, but since it's not explicitly what I'm trying to do, I'm concerned about side effects)
I use the following snippet to trap the return key and it works just fine, the noise does not occur if I click the button manually.
private void urlTextBox_KeyDown(object sender, KeyEventArgs e) {
if ( e.KeyCode == Keys.Return )
//if ( e.KeyValue.Equals(13) )
{
e.SuppressKeyPress = true;
//e.Handled = true;
goButton.PerformClick();
}
I am targetting .NET 4.0 so I should be able to implement most ideas.
Give this a shot:
private void urlTextBox_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Return)
{
e.SuppressKeyPress = true;
}
}
private void urlTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)Keys.Return)
{
e.Handled = true;
goButton.PerformClick();
}
}
Source
It may also work with the KeyDown event but I haven't tested it.
I have a standard WinForms-application. I want to implement such functionality:
user can press and hold only one keyboard button at a time. If he tried to press a button, while another button pressed, then it gets no result.
PS: this behavior spreads only to a form that I want, not to all forms of my application.
C#, 2.0 - 3.5, VS 2008
I got something similar than Khadaji
private Keys CurrentKey = Keys.None;
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (CurrentKey == Keys.None)
{
CurrentKey = e.KeyData;
// TODO: put your key trigger here
}
else
{
e.SuppressKeyPress = true;
}
}
private void Form1_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyData == CurrentKey)
{
// TODO: put you key end trigger here
CurrentKey = Keys.None;
}
else
{
e.SuppressKeyPress = true;
}
}
I banged this out pretty quickly, so you might have to tinker with it to make it work, but it should get you started.
Set your form's KeyPreview to true. Put the in a KeyDown event and KeyUp Event.
Keys MyKey;
bool KeyIsDown = false;
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (KeyIsDown)
{
e.Handled = true;
}
else
{
MyKey = e.KeyData;
}
}
private void Form1_KeyUp(object sender, KeyEventArgs e)
{
if (KeyIsDown)
{
if (e.KeyData == MyKey)
{
KeyIsDown = false;
}
}
}
How do I capture the enter key in a windows forms combo box when the combobox is active?
I've tried to listen to KeyDown and KeyPress and I've created a subclass and overridden ProcessDialogKey, but nothing seems to work.
Any ideas?
/P
Hook up the KeyPress event to a method like this:
protected void myCombo_OnKeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == 13)
{
MessageBox.Show("Enter pressed", "Attention");
}
}
I've tested this in a WinForms application with VS2008 and it works.
If it isn't working for you, please post your code.
In case you define AcceptButton on your form, you cannot listen to Enter key in KeyDown/KeyUp/KeyPress.
In order to check for that, you need to override ProcessCmdKey on FORM:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
if ((this.ActiveControl == myComboBox) && (keyData == Keys.Return)) {
MessageBox.Show("Combo Enter");
return true;
} else {
return base.ProcessCmdKey(ref msg, keyData);
}
}
In this example that would give you message box if you are on combo box and it works as before for all other controls.
or altertatively you can hook up the KeyDown event:
private void comboBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
MessageBox.Show("Enter pressed.");
}
}
private void comboBox1_KeyDown( object sender, EventArgs e )
{
if( e.KeyCode == Keys.Enter )
{
// Do something here...
} else Application.DoEvents();
}
Try this:
protected override bool ProcessCmdKey(ref Message msg, Keys k)
{
if (k == Keys.Enter || k == Keys.Return)
{
this.Text = null;
return true;
}
return base.ProcessCmdKey(ref msg, k);
}
It could be that your dialog has a button that's eating the enter key because it's set to be the AcceptButton in the form property.
If that's the case then you solve this like this by unsetting the AcceptButton property when the control gets focus then resetting it back once the control loses focus ( in my code, button1 is the accept button )
private void comboBox1_Enter(object sender, EventArgs e)
{
this.AcceptButton = null;
}
private void comboBox1_Leave(object sender, EventArgs e)
{
this.AcceptButton = button1;
}
private void comboBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyData == Keys.Enter)
{
MessageBox.Show("Hello");
}
}
I have to admit not liking my own solution as it seems a little hacky to unset/set the AcceptButton property so if anyone has a better solution then I'd be interested
protected void Form_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == 13) // or Key.Enter or Key.Return
{
MessageBox.Show("Enter pressed", "KeyPress Event");
}
}
Don't forget to set KeyPreview to true on the form.