How do I use the F2 key to open another form?

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How do I use the F2 key to open another form?

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#1 by (5 votes)
#2 by (4 votes)
#3 by (2 votes)
#4 by (0 votes)

1

I have the following code, but it enabled the ENTER (13) key to open the form, I would like to enable F2 , I already looked for ASCII tables everywhere and can not find the desired code.

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    {
        if (e.KeyChar == 13)
        {
            //sua rotina aqui
            OPERACOES OP = new OPERACOES();
            OP.ShowDialog();
        }
    }
}

c# .net winforms

asked by anonymous 23.09.2015 / 13:20

4 answers

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score 5 · Answer 1

You really have to check the key code and not the ASCII table:

private void Form1_KeyPress(object sender, KeyPressEventArgs e) {
    if (e.KeyCode == Keys.F2) {
        //sua rotina aqui
        OPERACOES OP = new OPERACOES();
        OP.ShowDialog();
    }
}

score 4 · Answer 2

You need to use the KeyCode property and compare it with Enum Keys to check which key is being pressed.

Example:

private void Form1_KeyPress(object sender, KeyPressEventArgs evt){
    if(e.KeyCode == Keys.F2)
    {
        OPERACOES OP = new OPERACOES();
        OP.ShowDialog();
    }
}

Do not forget that you need to change the KeyPreview property of the form to true

score 2 · Answer 3

The optimal way to process keyboard events in a form where the control that receives the event is irrelevant (that is, the focus can be on any control present in the form) is via override method ProcessCmdKey no form:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == Keys.F2)
    {
        MessageBox.Show("Você pressionou a tecla F2.");
        return true;    // Indica que o pressionar desta tecla 
                        // foi gerenciado aqui.
    }

    // Propaga o evento para o método da classe base
    return base.ProcessCmdKey(ref msg, keyData)
}

Source:
How do I capture Keys.F1 regardless of the focused control on a form?

score 0 · Answer 4

I found a list indicating some keyboard keys to use in the KeyUp event, did not check all but the "F2" worked.

Then just change the if.

Example:

//Verificando se foi acionado a tecla F2

if(e.KeyChar == **113**){

//comandos

}

Here's the list:

8: Place ('[BACKSPACE]');

9: Place ('[TAB]');

12: Place ('[ALT]');

13: Place ('[ENTER]');

16: Place ('[SHIFT]');

17: Place ('[CONTROL]');

18: Place ('[ALT]');

20: Place ('[CAPS LOCK]');

21: Place ('[PAGE UP]');

27: Place ('[ESC]');

33: Place ('[PAGE UP]');

34: Places ('[PAGE DOWN]');

35: Place ('[END]');

36: Place ('[HOME]');

37: Place ('[LEFT ARROW]');

38: Place ('[UP ARROW]');

39: Place ('[RIGHT ARROW]');

40: Place ('[DOWN ARROW]');

45: Place ('[INSERT]');

46: Place ('[DEL]');

91: Place ('[WIN LEFT]');

92: Place ('[WIN RIGHT]');

93: Place ('[POP-UP MENU]');

96: Places ('0 & 8242;);

97: Places ('1 & 8242;);

98: Places ('2 & 8242;);

99: Places ('3 & 8242;);

100: Places ('4 & 8242;);

101: Places ('5 & 8242;);

102: Places ('6 & 8242;);

103: Places ('7 & 8242;);

104: Places ('8 & 8242;);

105: Places ('9 & 8242;);

106: Place ('[NUM *]');

107: Places ('[NUM +]');

109: Places ('[NUM -]');

110: Place ('[DECIMAL SEPTEMBER]');

111: Places ('[NUM /]');

112: Place ('[F1]');

113: Place ('[F2]');

114: Place ('[F3]');

115: Place ('[F4]');

116: Place ('[F5]');

117: Place ('[F6]');

118: Place ('[F7]');

119: Place ('[F8]');

120: Place ('[F9]');

121: Place ('[F10]');

122: Place ('[F11]');

123: Place ('[F12]');

144: Place ('[NUM LOCK]');

186: Places ('Ç');

187: Place ('=');

188: Place (',');

189: Place ('-');

190: Place ('.');

191: Place (';');

192: Place ('[APÓSTROFO]');

193: Place ('/');

194: Place ('[IN A POINT]');

219: Place ('' ');

220: Place ('' ');

221: Place ('[');

222: Place ('~');

226: Place ('\');