.net mvc 数据注释模型状态 return 始终为真

Question

当我 post 一个无效的序列号时，它设置为“”（空字符串），我预计 ModelState.isValid 是假的，但它 returns 是真的。这是我的代码。

        private string _tcno { get; set; }  

        [Required(ErrorMessage = "Enter serial")]
        [StringLength(11, MinimumLength = 11, ErrorMessage="Invalid Serial Number")]
        [Column(TypeName = "nchar")]
        public string TCNO
        {
            get { return _tcno ?? ""; }
            set { 
                 value = value ?? ""; 
                 _tcno = value.IsValidTC() ? value : ""; 
            }
        }

我相信最小 11 长度验证为什么 ModelState.isValid 在这里是真的？

Answer 1

希望这会有所帮助。我做了以下操作，我得到了 12345678901 的 'valid' 和 1234

的 'invalid'

查看：

@model Testy20161006.Controllers.AttributeViewModel
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>IndexValid10</title>
</head>
<body>
    <div>
        @using (Html.BeginForm())
        {
            @Html.TextBoxFor(r => r.TCNO);
            <input type="submit" value="submit" />
        }
    </div>
</body>
</html>

Controller/ViewModel:

public class AttributeViewModel
{
    private string _tcno { get; set; }

    [Required(ErrorMessage = "Enter serial")]
    [StringLength(11, MinimumLength = 11, ErrorMessage = "Invalid Serial Number")]
    [Column(TypeName = "nchar")]
    public string TCNO
    {
        get { return _tcno ?? ""; }
        set
        {
            value = value ?? "";
            //modified this line
            _tcno = value;
        }
    }
}

public class HomeController : Controller
{
    [HttpPost]
    public ActionResult IndexValid10(AttributeViewModel attributeViewModel)
    {
        //set a breakpoint here
        if (ModelState.IsValid)
        {
            var isValid = true;
        }
        return View();
    }

Answer 2

下面的 Woking 副本使用我的验证方法，如果序列号无效，则设置“-”，这样验证错误消息正如我所料。

private string _tcno { get; set; }
        [Required(ErrorMessage = "Enter Serial")]
        [StringLength(11, MinimumLength = 11, ErrorMessage="Invalid Serial Number.")]
        [Column(TypeName = "nchar")]
        public string TCNO
        {
            get { return _tcno ?? ""; }
            set {
                value = value.IsValidTC() ? value : "-";
                _tcno = value;
            }
        }

.net mvc 数据注释模型状态 return 始终为真

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asp.net-mvc

data-annotations