KeyPress event equivalent in WPF

Question

i have the following code in WPA, and i am trying to convert it to WPF. I tried Keydown instead of Keypress and changed, for example,

(e.keyChar == \'-\')          


        

Answer 1

You're looking for the TextInput event, or perhaps PreviewTextInput.

The EventArgs type is TextCompositionEventArgs; I believe you want the Text property here, but I'm not at all sure of that.

Answer 2

<TextBox x:Name="txtbx" KeyDown="OnKeyDownHandler" Height="23" Width="250">
</TextBox>

private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Return)
    {
        txtbx.Text = "You Entered: " + txtbx.Text;
    }
}

Answer 3

It's very similar - but you compare e.Key to the Key enumeration.

Register your event handler somewhere (such as the constructor, or window_loaded):

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    this.KeyDown += new KeyEventHandler(MainWindow_KeyDown);
}

And then in the event handler:

void MainWindow_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Subtract)
    {
        // Do something
    }
}