Delete TextBox content when Backspace key is pressed C#

Question

I'm trying to delete the content of a TextBox when the backspace key is pressed, but it is not working. The code:

private void txtConteudo_TextChanged(object sender, TextChangedEventArgs e)
    {
        if(Keyboard.IsKeyDown(Key.Back))
        {
            txtConteudo.Text = "";
        }
    }

The xaml of the textbox:

<TextBox x:Name="txtConteudo" Text="0" FontSize="16" IsReadOnly="True" Margin="10,5,16,139" TextChanged="txtConteudo_TextChanged" />

http://stackoverflow.com/questions/12984522/how-to-get-iskeydown-method-to-work-in-c-sharp this might be helpful. — Emilia Tyl, Jul 29 '15 at 11:39

score 1 · Accepted Answer · answered Jul 29 '15 at 11:40

You want to use the PreviewKeyDown event instead. Try changing your current code to:

Code:

private void txtConteudo_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.IsKeyDown(Key.Back))
    {
        txtConteudo.Text = "";
    }
}

Xaml:

<TextBox x:Name="txtConteudo" Text="0" FontSize="16" IsReadOnly="True" Margin="10,5,16,139" PreviewKeyDown="txtConteudo_PreviewKeyDown" />

Developer Nation · Answer 2 · 2015-07-29T14:27:11.177

0

First of all, you shouldn't use textchanged event for that. Instead use KeyDown event

private void txtConteudo_KeyDown(object sender, KeyEventArgs e)
{
    if(e.KeyData == Key.Back)
    {
        txtConteudo.Text = "";
    }
}

edited Jul 29 '15 at 14:27

answered Jul 29 '15 at 11:41

Developer Nation

374
3
4
20

1

What namespace are you using KeyDownEventArgs from? – Bijington Jul 29 '15 at 11:48
please see the update by mistake i wrote "KeyDownEventArgs" instead of "KeyEventArgs". – Developer Nation Jul 29 '15 at 14:27

score 0 · Answer 3 · answered Jul 29 '15 at 11:42

0

Try this

private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyValue == 8)
            {
                textBox1.Text = "";
            }
        }

answered Jul 29 '15 at 11:42

Chandrashekar Jupalli

337
3
15

I just tested this and unfortunately pressing the Backspace key does not trigger the KeyDown event – Bijington Jul 29 '15 at 11:55

Delete TextBox content when Backspace key is pressed C#

3 Answers3