C# – Command for WPF TextBox that fires up when we hit Enter Key

cicommandnetwpf

It is very easy to bind Buttons in WPF apps to Commands in a VIEWMODEL class. I'd like to achieve a similar binding for a TextBox.

I have a TextBox and I need to bind it to a Command that fires up when I hit Enter while the TextBox is focused. Currently, I'm using the following handler for the KeyUp event, but it looks ugly…
and I can't put it in my VIEWMODEL class.

private void TextBox_KeyUp(object sender, KeyEventArgs e)
{
    if (e.Key == System.Windows.Input.Key.Enter)
    {
        // your event handler here
        e.Handled = true;
        MessageBox.Show("Enter Key is pressed!");
    }
}

Is there a better way to do this?

Best Answer

I've faced with the same problem and found solution here, here is the code sample:

<TextBox>
  <TextBox.InputBindings>
    <KeyBinding Command="{Binding Path=CmdSomething}" Key="Enter" />
  </TextBox.InputBindings>
</TextBox>

Related Solutions

C# – WPF: A TextBox that has an event that fires when the Enter Key is pressed

Have a look at this blog post from a few months back where I attach a 'global' event handler to TextBox.GotFocus to select the text.

Essentially you can handle the KeyUp event in your App class, like this:

protected override void OnStartup(StartupEventArgs e)
{
    EventManager.RegisterClassHandler(typeof(TextBox),
        TextBox.KeyUpEvent,
        new System.Windows.Input.KeyEventHandler(TextBox_KeyUp));

    base.OnStartup(e);
}

private void TextBox_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
{
    if (e.Key != System.Windows.Input.Key.Enter) return;

    // your event handler here
    e.Handled = true;
    MessageBox.Show("Enter pressed");
}

... and now every TextBox in your application will call the TextBox_KeyUp method as users type into them.

Update

As you've pointed out in your comment, this is only useful if every TextBox needs to execute the same code.

To add an arbitrary event like an Enter keypress, you might be better off looking into Attached Events. I believe this can get you what you want.

Wpf – Multiline for WPF TextBox

Enable TextWrapping="Wrap" and AcceptsReturn="True" on your TextBox.

You might also wish to enable AcceptsTab and SpellCheck.IsEnabled too.

Best Answer

Related Solutions

C# – WPF: A TextBox that has an event that fires when the Enter Key is pressed

Wpf – Multiline for WPF TextBox

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