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How to make a text field that is allowed only an integer value?

I want to make a text box in my wpf application that will only accept integer values. if someone types between [az], the text box will reject it. Thus, it will not appear in the text box

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5 answers

You can handle the PreviewTextInput event:

private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
  // Filter out non-digit text input
  foreach (char c in e.Text) 
    if (!Char.IsDigit(c)) 
    {
      e.Handled = true;
      break;
    }
}
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You can add an event descriptor TextChangedand see what was entered (it is necessary to check all the text each time to prevent pasting letters from the clipboard).

Also see a very good example of creating a maskable editbox on CodeProject .

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WPF KeyDown :

private void MyTextBox_KeyDown(object sender, KeyDownEventArgs e)
{
    e.Handled = true;
}
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this simple piece of code should do the trick. You might also want to check for overflow (numbers too large)

private void IntegerTextBox_TextChanged(object sender, EventArgs e)
{
    for (int i = 0; i < Text.Length; i++)
    {
        int c = Text[i];
        if (c < '0' || c > '9')
        {
           Text = Text.Remove(i, 1);
         }
    }
}
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Bind it to the Integer property. WPF will independently validate without any additional problems.

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