无法隐式转换类型'int?' 'int' [英] Cannot implicitly convert type 'int?' to 'int'

问题描述

在此查询中，我有3条记录(int-(telefon = d.telefon)，decimal-(pesel = d.pesel)，decimal-(nip = d.nip))是字符串.

In this query I have 3 records (int-(telefon = d.telefon), decimal-(pesel = d.pesel), decimal-(nip = d.nip)) another records are strings.

public ActionResult detail(int LoginID)
{
    var user = (from d in baza.uzytkowniks
                where LoginID == d.LoginID
                select new uzytkownikModel {
                    imie = d.imie, 
                    nazwisko = d.nazwisko, 
                    telefon = d.telefon, 
                    pesel = d.pesel, 
                    nip = d.nip, 
                    email = d.email, 
                    adres_zamieszkania = d.adres_zamieszkania}).ToList();

    ViewBag.daneuser = user;
    return View();
}

我有错误:

无法隐式转换类型'int?'到"int".显式转换 存在(您是否缺少演员表?)

Cannot implicitly convert type 'int?' to 'int'. An explicit conversion exists (are you missing a cast?)

和另外两个带有十进制?"的错误而不是'int?'.

and two another errors with 'decimal?' instead 'int?'.

型号:

 public class uzytkownikModel
    {
    [Required]
    public string imie { get; set; }

    [Required]
    public string nazwisko { get; set; }


    public decimal pesel { get; set; }
    public decimal nip { get; set; }

    public string adres_zamieszkania { get; set; }
    public int telefon { get; set; }
    public string email { get; set; }

}

只有imie和nazwisko不可为空，其余的则允许为空

Only imie and nazwisko are nonnullable, rest have allow null

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

现在工作.我更改了型号:

   decimal to decimal?

和

int to int?

谢谢大家的帮助

推荐答案

在您的uzytkownikModel类中，可为空的属性应声明为"int?".或十进制?"而不是"int"和"decimal".

In your uzytkownikModel class, the properties that are nullable should be declared as "int?" or "decimal?" instead of "int" and "decimal".

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