Good, how can I validate phone numbers in c# but that it only recognizes numbers and () - in its respective format?
I have the following code to validate number but not for the above.
if (Char.IsNumber(e.KeyChar))//Si es número
{
e.Handled = false;
}
else if (e.KeyChar == (char)Keys.Back)//si es tecla borrar
{
e.Handled = false;
}
else //Si es otra tecla cancelamos
{
e.Handled = true;
}
Good morning, one option is to only accept numbers and when you save it, format it as follows:
string telefono = String.Format("{0:(###) ###-####}", 8005551212);
To know more about formats that you can give to a string you have this page
Another option is to use MaskedTextBox , to which you assign the format you want your entry to be in the Mask property, here you will find information on how to add a mask. Here is the example of how to add a mask to a phone
MaskedTextBox mascara = new MaskedTextBox();
mascara.Mask = "(999)-000-0000";
This is a Windows Forms control, so from the desingner you can put the mask.
If you are on the Web, I recommend you do it through JavaScript, here is a example .
The last option is to use Regex, I found an expression that works according to this post .
"/\(?([0-9]{3})\)?([ .-]?)([0-9]{3})([0-9]{4})/"
Complementing the answer of @ randall-sandoval, if you do not want to use MaskedTextBox , you can use a method with the Regex pattern that suits you best and send it to call in the Leave event of a TextBox :
// Static class Utilerias
public static bool ValidarTelefonos7a10Digitos(string strNumber)
{
Regex regex = new Regex("\A[0-9]{7,10}\z");
Match match = regex.Match(strNumber);
if (match.Success)
return true;
else
return false;
}
... // Leave Event of TelefonoTextBox
if (Utilerias.ValidarTelefonos7a10Digitos(TelefonoTextBox.Text))
{
errorProvider2.SetError(TelefonoTextBox, "Debe capturar un teléfono de 7 a 10 digitos.");
}
With the next event in the Text box
private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (!(char.IsNumber(e.KeyChar)) && (e.KeyChar != (char)Keys.Back))
{
MessageBox.Show("Solo se permiten numeros", "Advertencia", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
e.Handled = true;
return;
}
}