csharp将用户输入的过期日期与今日日期进行比较，以检查有效性

Question

c夏普

    // initate with button

     private void ChkDateBtn_Click(object sender, EventArgs e)
            {
                stInputDate = DateTxtBx.Text;  // input from text box
                // bExpDateLater already defined as bool
                bExpDateLater = ValidateExpDate(stInputDate);

                if (bExpDateLater == true)
                {
                    OutputTxtBox.Text = "This is a valid Date";
                }
                else
                {
                    OutputTxtBox.Text = "This is not a valid Date";
                }

            }

    // validate date as later than today

    private bool ValidateExpDate(string expdate)
            {
                // expdate string format yyyy-MM-dd
                DateTime sDateNow = DateTime.Now;

                // remove hyphen from date
                expdate = expdate.Replace("-", "");
                string format = "yyyyMMdd";
                DateTime sCompareDate;
                DateTime.TryParseExact(expdate, format,System.Globalization.CultureInfo.InvariantCulture.DateTimeStyles.None, out sCompareDate);

                if (sDateNow < sCompareDate)
                {
                    return true;

                }
                else
               {

                    return false;
                }
            }

如有任何建议，不胜感激

Answer 1

问题在于我是如何解析日期的

这就是解决办法

    private bool ValidateExpDate(string expdate)
    {
        // expdate string format yyyy-MM-dd
        DateTime dtDateNow = DateTime.Now;
        // DateTime shortDateNow = dtDateNow.ToShortTimeString;

        // remove hyphen from date
        expdate = expdate.Replace("-", "");
        string format = "yyyyMMdd";

        DateTime dtCompareDate = DateTime.ParseExact(expdate, format, System.Globalization.CultureInfo.CurrentCulture);

        if (dtDateNow < dtCompareDate)
        {
            return true;

        }
        else
        {

            return false;
        }
    }