C# Compare the Key Pressed on the Keyboard

Question

I have a textbox and a button.I'm saving the value(keyboard key) entered in the TextBox.I need to give a message when I press the right keyboard key.

private void btn_Click(object sender, EventArgs e)
{
    Properties.Settings.Default.text1 = text1.Text;
    Properties.Settings.Default.Save();
}

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyData == text1.Text) //--------->> error
    {
        MessageBox.Show("success");
    }
}

how can I provide this condition?

There are several practical problems with this code. The distinction between the virtual key provided by KeyDown and the character provided by KeyPress is one. But most severely, how would you ever type any text inside the textbox if you also have the form objecting against it? The true intention is too hard to divine from the snippet. — Hans Passant, Apr 15 '18 at 09:50

Başar Kaya · Answer 1 · 2018-04-15T09:51:58.430

0

If you compare with one char text. You can try this.

private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (txt.Text.Length == 1 && e.KeyValue == (int)txt.Text[0]) //--------->> error
            {
                MessageBox.Show("success");
            }
        }

edited Apr 15 '18 at 09:51

answered Apr 15 '18 at 09:43

Başar Kaya

354
6
13

KeyEventArgs has no key defined, maybe you meant KeyCode? – styx Apr 15 '18 at 09:48
@Başar Kaya Thank you for your answer.But, did not detect F keys and number keys. – H.Marcus Apr 15 '18 at 10:22

score 0 · Accepted Answer · answered Apr 15 '18 at 09:56

0

maybe easier it will be to use KeysConverter

 private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            KeysConverter convertor = new KeysConverter();
            string keyPressed = convertor.ConvertToString(e.KeyValue);
            if (keyPressed == text1.Text)
            {
                //do stuff
            }
        }

answered Apr 15 '18 at 09:56

styx

1,852
1
11
22

Thank you for your answer.But, did not detect number keys. – H.Marcus Apr 15 '18 at 10:22
@H.Marcus it does, please make sure that `KeyPreview` in your form is set to `True` – styx Apr 15 '18 at 10:31
Yes, I did it before. – H.Marcus Apr 15 '18 at 10:39
@H.Marcus which keys exactly it does not detect? – styx Apr 15 '18 at 10:41
1-2-3-4-5-6-7-8-9-0 – H.Marcus Apr 15 '18 at 10:42
@H.Marcus have you put a breakpoint on the first line inside the KeyDown event and tried to press "1"? – styx Apr 15 '18 at 10:44
I did not fully understand the question. – H.Marcus Apr 15 '18 at 10:47
on the first line of Form1_KeyDown() put a breakpoint(where KeysConverter is declared) put a breakpoint, press one on your keyboard and check if the event fires – styx Apr 15 '18 at 10:50
are working with WPF or WinForms? also try to create a new project to check if the problem reproduce – styx Apr 15 '18 at 10:57
1

I will try but that is enough for me.Thank you for your help. :) – H.Marcus Apr 15 '18 at 11:03

C# Compare the Key Pressed on the Keyboard

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