ASP.NET MVC 5 ModelState.IsValid始终在MVC中返回false

Question

我每次都面临ModelState.IsValid false。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Data Annotation声明为Required。所以基本上这个错误表明我的状态在模型中是必需的。这就是为什么它给出验证错误。

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); 
    } 

这是我在同一个控制器的另一种方法

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); 
     } 

    } 

这是我的查看

      <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

在你的问题的评论表示您这是你的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; } 

您需要设置选择标签的name属性为MVC结合工作。所以加上这个名字是这样的：

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