Text box accept only number and one decimal place in wpf

Question

I need my text box to accept only number with one decimal point. I created a function to accept only numeric value. Now I need a help for accept only one decimal point:

private void txtOpenBal_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
    foreach (char ch in e.Text)
        if (!(Char.IsDigit(ch) || ch.Equals('.')))
        {
            e.Handled = true;
        }
}

It accept more than one decimal point

You need to use regex. there are similar posts: http://stackoverflow.com/questions/23705423/regex-for-1-or-2-digits-with-one-optional-decimal-place http://stackoverflow.com/questions/308122/simple-regular-expression-for-a-decimal-with-a-precision-of-2 — ehh, Jul 24 '15 at 05:38
You can try this http://stackoverflow.com/questions/16914224/wpf-textbox-to-enter-decimal-values — Dinesh balan, Jul 24 '15 at 06:41

score 1 · Answer 1 · answered Jul 24 '15 at 06:49

private void TextBox_PreviewTextInput_1(object sender, TextCompositionEventArgs e)
    {
        // Here e.Text is string so we need to convert it into char
        char ch = e.Text[0];

        if ((Char.IsDigit(ch) || ch == '.'))
        {
            //Here TextBox1.Text is name of your TextBox
            if (ch == '.' && TextBox1.Text.Contains('.')) 
                e.Handled = true;
        }
        else
            e.Handled = true;
    }

score 1 · Answer 2 · answered Jul 24 '15 at 07:24

As @ehh said using regular expressions we can achive this.add the namespace System.Text.RegularExpressions;

private void TextBox_PreviewTextInput_1(object sender, TextCompositionEventArgs e)
    {
       Regex objregex = new Regex(@"^\d*\.\d{1}$");
       if (objregex.IsMatch(txtDomain.Text))
           {
             //do whatewer you want
           }    
  else
           { 
             //do whatewer you want
           }    

    }

Text box accept only number and one decimal place in wpf

2 Answers2