ASP.NET MVC 5 ModelState.IsValid 在 MVC 中总是返回 false

Question

我每次都面临 ModelState.IsValid 错误。我调试了整个动作。当我展开 ModelState 错误部分时，我发现 System.Web.Mvc.Model 错误。在我的模型中，Status 属性通过数据注释声明为 Required。所以基本上错误表明我的状态在模型中是必需的。这就是它给出验证错误的原因。

这是我的模型

public class CompanyResource
{
    [Key]
    public int Id { get; set; }
    [Required]
    [StringLength(100)]
    public string Name { get; set; }
    [StringLength(100)]
    public string Position { get; set; }
    [Display(Name="Date of Joining")]
    public DateTime? DOJ { get; set; }
    [StringLength(50)]
    public string Phone { get; set; }
    [StringLength(100)]
    public string Address { get; set; }
    [StringLength(1)]
    [Required]
    public string Status { get; set; }

    public virtual ICollection<ProjectResource> ProjectResources { get; set; }
    public virtual ICollection<ProjectSiteResource> ProjectSiteResources { get; set; }
 }

}

这是我的行动

 [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "Id,Name,Position,DOJ,Phone,Address,Status")] CompanyResource companyResource)
    {
       var isAjaxRequest = Request.IsAjaxRequest();
        ModelState["Status"].Errors.Clear();

        if (ModelState.IsValid)
        {
            db.CompanyResource.Add(companyResource);
            db.SaveChanges();

            if (isAjaxRequest)
            {
                var staff = new SelectList(db.CompanyResource.ToList(), "Id", "Name");
                return Json(new { Flag = true, CompanyResources = staff }, JsonRequestBehavior.AllowGet);
            }

            Success(string.Format("Successfully save data !"), true);
            return RedirectToAction("Index");
        }
        if (!isAjaxRequest) return View(companyResource);
        return Json(null, JsonRequestBehavior.AllowGet);
    }

这是我在同一控制器中的另一种方法

  public JsonResult GetStaff()
    {
        try
        {
            var staff = new SelectList(db.CompanyResource.ToList(), "Id", "Name");
            return Json(new { Flag = true, CompanyResources = staff }, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { Flag = false, Msg = ex.Message }, JsonRequestBehavior.AllowGet);
        }

    }

这是我的观点

                            <div class="form-group">
                                @Html.Label("Status", htmlAttributes: new { @class = "control-label col-md-2", @required = "required" })
                                <div class="col-md-10">
                                    <select class="form-control" id="Status">
                                        <option value="A">Active</option>
                                        <option value="I">Inactive</option>
                                    </select>

                                </div>
                            </div>

Answer 1

在对您的问题的评论中，您指出这是您的 HTML 和型号：

<select class="form-control" id="Status"> 
    <option value="A">Active</option> 
    <option value="I">Inactive</option> 
</select>
[StringLength(1)] [Required] public string Status { get; set; }

您需要设置 select 标记的 name 属性以使 MVC 绑定起作用。所以像这样添加名称：

<select class="form-control" id="Status" name="Status"> 
    <option value="A">Active</option> 
    <option value="I">Inactive</option> 
</select>

ASP.NET MVC 5 ModelState.IsValid 在 MVC 中总是返回 false

ASP.NET MVC 5 ModelState.IsValid is always returning false in MVC

c#

asp.net

asp.net-mvc

entity-framework

asp.net-mvc-4