Question

我通过编码构建了一个特定的功能。这是我的代码：

public static string GetRefNo()
    {
        using (DataClassesDataContext db = new DataClassesDataContext())
        {
            string tickPrefix = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.TicketPrefix).SingleOrDefault();
            int xyear = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Year).SingleOrDefault();
            int xmonth = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Month).SingleOrDefault();
            int xday = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Day).SingleOrDefault();
            int xcounter = int.Parse(db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Counter).SingleOrDefault().ToString());
            xcounter++;
            var query = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u).ToList();
            foreach (var item in query)
            {
                if (item != null)
                {
                    db.ExecuteCommand("UPDATE [CRM].[dbo].[tbl_User_master] SET [Counter] = {0} WHERE Ref_no = {1}", xcounter, item.Ref_no);
                }
            }
             return tickPrefix + xyear.ToString().Substring(3, 1) + xmonth.ToString() ? 0.PadLeft(2, '0') + xday.ToString().PadLeft(2, '0') + xcounter.ToString().PadLeft(2, '0');
        }
    }

现在我只想检查xmonth.ToString()是否小于10，然后只需应用此PadLeft(2, '0')其他简单xmonth.ToString()。

请帮帮我....

Answer 1

您正在寻找这样的表达式：

xmonth < 10 ? xmonth.ToString().PadLeft(2, '0') : xmonth.ToString()

Answer 2

 public static string GetRefNo()
    {
        using (DataClassesDataContext db = new DataClassesDataContext())
        {
            string tickPrefix = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.TicketPrefix).SingleOrDefault();
            int xyear = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Year).SingleOrDefault();
            int xmonth = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Month).SingleOrDefault();
            int xday = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Last_Login_Datetime.Value.Day).SingleOrDefault();
            int xcounter = int.Parse(db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u.Counter).SingleOrDefault().ToString());
            xcounter++;
            var query = db.Users.Where(u => u.Username.Equals((String)HttpContext.Current.Session["Username"])).Select(u => u).ToList();
            foreach (var item in query)
            {
                if (item != null)
                {
                    db.ExecuteCommand("UPDATE [CRM].[dbo].[tbl_User_master] SET [Counter] = {0} WHERE Ref_no = {1}", xcounter, item.Ref_no);
                }
            }
            string c = (xcounter < 10) ? xcounter.ToString().PadLeft(2, '0') : xcounter.ToString();
            string m = (xmonth < 10) ? xmonth.ToString().PadLeft(2, '0') : xmonth.ToString();
            string d = (xday < 10) ? xday.ToString().PadLeft(2, '0') : xday.ToString();
            return tickPrefix + xyear.ToString().Substring(3, 1) + m + d + c;
        }
    }

如何应用三元运算符

2 个答案: