Basic arithmatic calculator in textbox

Summary:

Hi all, I can only add in my textbox, but want to be able to +*- and /.

Basic arithmatic calculator in textbox

Simeon (guest) 30 Oct 2018 19:14

Hi all, I have been searching for days and cannot find any help. I need to be able to +*-/ all in one textbox.
as an example, 123+34*4+334-300. I am not using any buttons as the numpad on the keyboard is my buttons, but I want them all to work in my textbox like a calculator. I currently can do only add, no matter what character I use. Code:

private void calculatortxt_KeyPress(object sender, KeyPressEventArgs e)
        {

            if (!(char.IsDigit(e.KeyChar) || e.KeyChar == (char)Keys.Back || e.KeyChar == '.' || e.KeyChar == '+' || e.KeyChar == '-' || e.KeyChar == '*' || e.KeyChar == '/'))
            { e.Handled = true; }
            TextBox txtDecimal = sender as TextBox;

            double Total;
            string[] numbers = calculatortxt.Text.Split('+', '-', '*', '/');
            Total = 0;
            foreach (string value in numbers)
            {
                if (!string.IsNullOrEmpty(value))
                {
                    Total = Total + Convert.ToDouble(value);
                }
            }

            if (e.KeyChar == (Char)Keys.Enter)
            {
                //calculatortxt.Text = Total.ToString();
            }
            if (e.KeyChar == (Char)Keys.Escape)
            {
                calculatortxt.Text = "";
            }
        }