Winform--TextBox

TextBox只允许输入数字

方法一（来自罗友军）

 public static bool IsNumeric(string itemValue)
{
    return (IsRegEx("^(-?[0-9]*[.]*[0-9]{0,3})$", itemValue));
}

方法二（来自博为药库）

private void CellEdit_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (this.dgvDrugList.CurrentCell.ColumnIndex == 5 || this.dgvDrugList.CurrentCell.ColumnIndex == 7)
            {
                //若按下的是非数字，则不进行处理；  46 = '.'
                if (!(Char.IsNumber(e.KeyChar)) && !(e.KeyChar == (char)Keys.Enter) && !(e.KeyChar == (char)Keys.Left) &&
                    !(e.KeyChar == (char)Keys.Right) && !(e.KeyChar == (char)Keys.Back) && !(e.KeyChar == 46))
                {
                    e.Handled = true;
                }

                //当存在小数点时,若再输入小数点将不会进行处理
                string str = ((TextBox)sender).Text;
                if (str.Contains(".") && (e.KeyChar == 46))
                    e.Handled = true;
            }
        }